Tokushima University / Educator and Researcher Directory --- Iwata, Tetsuo

Personal Web Page

https://researchmap.jp/read0191784 (researchmap)

Field of Study

○	Spectoscopic Measurement

Subject of Study

○	Instrumentation for Spectroscopic Measurements, Spectral Data Processing (Time-Resolved Spectrosopy, Multivariate Analysis, Scientific Measurements)

Book / Paper

Book:

1.	Tetsuo Iwata : 発光の事典 3.2.3節周波数領域法(位相法), 朝倉書店, Tokyo, Sep. 2015.
2.	Tetsuo Iwata, 荒木勉, 橋本正治 and 岡宏一 : 基礎からのメカトロニクス, 日新出版, Tokyo, Apr. 2007.
3.	Tetsuo Iwata : Fundamentals of Optical Spectroscopy; Light Source Photosensors, Wavelength Selection (Handbook of Materials Measurement Methods), Springer-Verlag, Dec. 2006.
4.	Tetsuo Iwata : Fabry-Perot Interferometers for Mid-Infrared Spectroscopy (Handbook of Vibrational Spectroscopy I), John Wiley & Sons, Inc., Dec. 2001. (Summary) 著者が提案した装置，すなわち「ファブリペロー干渉計をベースとした高分解能，広帯域，高オプティカルスループットの分光システム」の解説を行った．

Academic Paper (Judged Full Paper):

1.	Masatomo Yamagiwa, Takeo Minamikawa, Minamiji Fui, Takahiko Mizuno, Yu Tokizane, Oe Ryo, Koresawa Hidenori, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Visualization of internal structure and internal stress in visibly opaque objects using full-field phase-shifting terahertz digital holography, Optics Express, Vol.27, No.23, 33854-33868, 2019. (Summary) We construct a full-field phase-shifting terahertz digital holography (PS-THz-DH) system by use of a THz quantum cascade laser and an uncooled, 2D micro-bolometer array. The PS-THz-DH enables us to separate the necessary diffraction-order image from unnecessary diffraction-order images without the need for spatial Fourier filtering, leading to suppress the decrease of spatial resolution. 3D shape of a visibly opaque object is visualized with a sub-millimeter lateral resolution and a sub-µm axial resolution. Also, the digital focusing of amplitude image enables the visualization of internal structure with the millimeter-order axial selectivity. Furthermore, the internal stress distribution of an externally compressed object is visualized from the phase image. The demonstrated results imply a possibility for non-destructive inspection of visibly opaque non-metal materials. (Tokushima University Institutional Repository) ● Metadata: 114124 (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.27.033854 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 31878445 ● Search Scopus @ Elsevier (PMID): 31878445 ● Search Scopus @ Elsevier (DOI): 10.1364/OE.27.033854 (Tokushima University Institutional Repository: 114124, DOI: 10.1364/OE.27.033854, PubMed: 31878445)
2.	Tetsuo Iwata and Yuki Hase : Fluorescence lifetime estimation by 1 bit photon autocorrelation procedure from time series data recorded using a high speed digitizer, Optical Review, Vol.26, No.4, 362-368, 2019. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-019-00508-4 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-019-00508-4 (DOI: 10.1007/s10043-019-00508-4)
3.	Ryo Oe, Takeo Minamikawa, Shuji Taue, Hidenori Koresawa, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata and Takeshi Yasui : Refractive index sensing with temperature compensation by a multimode-interference fiber-based optical frequency comb sensing cavity, Optics Express, Vol.27, No.15, 21469-21476, 2019. (Summary) We proposed a refractive index (RI) sensing method with temperature compensation by using an optical frequency comb (OFC) sensing cavity including a multimode-interference (MMI) fiber, namely, the MMI-OFC sensing cavity. The MMI-OFC sensing cavity enables simultaneous measurement of material-dependent RI and sample temperature by decoding from the comb spacing frequency shift and the wavelength shift of the OFC. We realized the simultaneous and continuous measurement of RI-related concentration of a liquid sample and its temperature with precisions of 1.6 × 104 RIU and 0.08 °C. The proposed method would be a useful means for the various applications based on RI sensing. (Tokushima University Institutional Repository) ● Metadata: 113642 (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.27.021463 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85069881072 (Tokushima University Institutional Repository: 113642, DOI: 10.1364/OE.27.021463, Elsevier: Scopus)
4.	Hidenori Koresawa, Kyuki Shibuya, Takeo Minamikawa, Akifumi Asahara, Ryo Oe, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto, Kaoru Minoshima and Takeshi Yasui : Lock-in-detection dual-comb spectroscopy, OSA Continuum, Vol.2, No.6, 1998-2007, 2019. (Summary) Dual-comb spectroscopy (DCS) is useful for gas spectroscopy due to the high potential of optical frequency comb (OFC). However, fast Fourier transform (FFT) calculation of a huge amount of temporal data spends significantly longer time than the acquisition time of an interferogram. In this article, we demonstrate frequency-domain DCS by a combination of DCS with lock-in detection, namely LID-DCS. LID-DCS directly extracts an arbitrary OFC mode from a vast number of OFC modes without the need for FFT calculation. Usefulness of LID-DCS is demonstrated in the rapid monitoring of transient signal change and spectroscopy of hydrogen cyanide gas. (Link to Publication Site) ● Publication site (DOI): 10.1364/OSAC.2.001998 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85069176229 (DOI: 10.1364/OSAC.2.001998, Elsevier: Scopus)
5.	Ryo Oe, Takeo Minamikawa, Shuji Taue, Takuya Nakahara, Hidenori Koresawa, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Yoshiaki Nakajima, Kaoru Minoshima and Takeshi Yasui : Improvement of dynamic range and repeatability in a refractive-index- sensing optical comb by combining saturable-absorber-mirror mode- locking with an intracavity multimode interference fiber sensor, Japanese Journal of Applied Physics, Vol.58, No.6, 060912, 2019. (Summary) A mode-locked fiber comb equipped with a multimode interference fiber sensor functions as a high-precision refractive-index (RI) sensor benefitting from precise RF measurement. However, its dynamic range and repeatability are hampered by the inherent characteristics of nonlinear- polarization-rotation mode-locking oscillation. In this article, we introduce saturable-absorber-mirror mode-locking for RI sensing with a wide dynamic range and high repeatability. While the RI dynamic range was expanded to 41.4 dB due to high robustness against cavity disturbance, the self-starting capability without the need for polarization control improves the RI sensing repeatability to 1.10 × 108 for each mode-locking activation. The improved dynamic range and repeatability will be useful for enhancing the performance of RI sensing. (Tokushima University Institutional Repository) ● Metadata: 113641 (Link to Publication Site) ● Publication site (DOI): 10.7567/1347-4065/ab219a (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85069886936 (Tokushima University Institutional Repository: 113641, DOI: 10.7567/1347-4065/ab219a, Elsevier: Scopus)
6.	Tetsuo Iwata and Tomohiro Miyauchi : 1-bit photon cross-correlation-based phase-modulation fluorometer using an OFDM signal-modulated excitation light source, Measurement Science & Technology, Vol.30, No.6, 065901-9, 2019. (Link to Publication Site) ● Publication site (DOI): 10.1088/1361-6501/ab0f77 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85067558008 (DOI: 10.1088/1361-6501/ab0f77, Elsevier: Scopus)
7.	Takashi Ogura, Yoshiaki Nakajima, Yi-Da Hsieh, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Kaoru Minoshima and Takeshi Yasui : Lens-less fiber coupling of a 1550-nm mode-locked fiber laser light on a low-temperature-grown GaAs photoconductive antenna, OSA Continuum, Vol.2, No.4, 1310-1317, 2019. (Tokushima University Institutional Repository) ● Metadata: 113640 (Link to Publication Site) ● Publication site (DOI): 10.1364/OSAC.2.001310 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85069194963 (Tokushima University Institutional Repository: 113640, DOI: 10.1364/OSAC.2.001310, Elsevier: Scopus)
8.	Takeo Minamikawa, Takashi Masuoka, Takashi Ogura, Kyuki Shibuya, Ryo Oe, Eiji Hase, Yoshiaki Nakajima, Yoshihisa Yamaoka, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Kaoru Minoshima and Takeshi Yasui : Ultrasonic wave sensing using an optical-frequency-comb sensing cavity for photoacoustic imaging, OSA Continuum, Vol.2, No.2, 439-449, 2019. (Summary) We propose a novel ultrasonic wave sensing method employing an optical-frequency-comb (OFC) cavity, namely, an OFC sensing cavity-based ultrasonic wave sensor. We confirm the fundamental characteristics of the OFC sensing cavity-based ultrasonic wave sensor by using an ultrasonic wave transducer and realize the frequency response of up to 13 MHz with a linear response. We also confirm the potential applicability in photoacoustic imaging employing an 8-ns pulsed laser. Our demonstrations confirm the capability of the concept of the OFC sensing cavity in ultrasonic wave sensing and will also expand the potential of OFC technology. (Link to Publication Site) ● Publication site (DOI): 10.1364/OSAC.2.000439 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OSAC.2.000439 (DOI: 10.1364/OSAC.2.000439)
9.	Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Ryuji Ichikawa, Yi-Da Hsieh, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Scan-Less, Kilo-Pixel, Line-Field Confocal Phase Imaging with Spectrally Encoded Dual-Comb Microscopy, IEEE Journal of Selected Topics in Quantum Electronics, Vol.25, No.1, 6801408, 2018. (Summary) Confocal laser microscopy (CLM) is a powerful tool in life science research and industrial inspection, and its image acquisition rate is boosted by scan-less imaging techniques. However, the optical-intensity-based image contrast in CLM makes it difficult to visualize transparent non-fluorescent objects or reflective objects with nanometer unevenness. In this paper, we introduce an optical frequency comb (OFC) to scan-less CLM to give the optical-phase-based image contrast. One-dimensional (1D) image pixels of a sample are separately encoded onto OFC modes via 1D spectral encoding by using OFC as an optical carrier of amplitude and phase with a vast number of discrete frequency channels. Then, line-field confocal information of amplitude and phase are decoded from a mode-resolved OFC amplitude and phase spectra obtained by dual-comb spectroscopy without the need for mechanical scanning. The proposed confocal phase imaging will further expand the application fields of CLM. (Tokushima University Institutional Repository) ● Metadata: 113637 (Link to Publication Site) ● Publication site (DOI): 10.1109/JSTQE.2018.2879017 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85056348979 (Tokushima University Institutional Repository: 113637, DOI: 10.1109/JSTQE.2018.2879017, Elsevier: Scopus)
10.	Masatomo Yamagiwa, Takeo Minamikawa, Clément Trovato, Takayuki Ogawa, Dahi Abdelsalam Ghareab Ibrahim, Yusuke Kawahito, Ryo Oe, Kyuki Shibuya, Takahiko Mizuno, Emmanuel Abraham, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto, Kaoru Minoshima and Takeshi Yasui : Multicascade-linked synthetic wavelength digital holography using an optical-comb-referenced frequency synthesizer, Optics Express, Vol.26, No.20, 26292-26306, 2018. (Summary) Digital holography (DH) is a promising method for non-contact surface topography because the reconstructed phase image can visualize the nanometer unevenness in a sample. However, the axial range of this method is limited to the range of the optical wavelength due to the phase wrapping ambiguity. Although the use of two different wavelengths of light and the resulting synthetic wavelength, i.e., synthetic wavelength DH, can expand the axial range up to several hundreds of millimeters, its axial precision does not reach sub-micrometer. In this article, we constructed a tunable external cavity laser diode phase-locked to an optical frequency comb, namely, an optical-comb-referenced frequency synthesizer, enabling us to generate multiple synthetic wavelengths within the range of 32 µm to 1.20 m. A multiple cascade link of the phase images among an optical wavelength ( = 1.520 µm) and 5 different synthetic wavelengths ( = 32.39 µm, 99.98 µm, 400.0 µm, 1003 µm, and 4021 µm) enables the shape measurement of a reflective millimeter-sized stepped surface with the axial resolution of 34 nm. The axial dynamic range, defined as the ratio of the axial range ( = 2.0 mm) to the axial resolution ( = 34 nm), achieves 5.9 × 10, which is larger than that of previous synthetic wavelength DH. Such a wide axial dynamic range capability will further expand the application field of DH for large objects with meter dimensions. (Tokushima University Institutional Repository) ● Metadata: 113643 (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.26.026292 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 30469719 ● Summary page in Scopus @ Elsevier: 2-s2.0-85053916889 (Tokushima University Institutional Repository: 113643, DOI: 10.1364/OE.26.026292, PubMed: 30469719, Elsevier: Scopus)
11.	Tetsuo Iwata and Takanori Taga : High-efficiency photon-counting fluorometer with a channel width of 5.0 ps, Optical Review, Vol.25, No.5, 608-614, 2018. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-018-0454-z (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-018-0454-z (DOI: 10.1007/s10043-018-0454-z)
12.	Ryo Oe, Shuji Taue, Takeo Minamikawa, Kohsuke Nagai, Kyuki Shibuya, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Hideki Fukano, Yoshiaki Nakajima, Kaoru Minoshima and Takeshi Yasui : Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor, Optics Express, Vol.26, No.15, 19694-19706, 2018. (Summary) Optical frequency combs (OFCs) have attracted attention as optical frequency rulers due to their tooth-like discrete spectra together with their inherent mode-locking nature and phase-locking control to a frequency standard. Based on this concept, their applications until now have been demonstrated in the fields of optical frequency metrology. However, if the utility of OFCs can be further expanded beyond their application by exploiting new aspects of OFCs, this will lead to new developments in optical metrology and instrumentation. Here, we report a fiber sensing application of OFCs based on a coherent link between the optical and radio frequencies, enabling high-precision refractive index measurement based on frequency measurement in radio-frequency (RF) region. Our technique encodes a refractive index change of a liquid sample into a repetition frequency of OFC by a combination of an intracavity multi-mode-interference fiber sensor and wavelength dispersion of a cavity fiber. Then, the change in refractive index is read out by measuring the repetition frequency in RF region based on a frequency standard. Use of an OFC as a photonic RF converter will lead to the development of new applications in high-precision fiber sensing with the help of functional fiber sensors and precise RF measurement. (Tokushima University Institutional Repository) ● Metadata: 113645 (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.26.019694 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 30114139 ● Summary page in Scopus @ Elsevier: 2-s2.0-85051806746 (Tokushima University Institutional Repository: 113645, DOI: 10.1364/OE.26.019694, PubMed: 30114139, Elsevier: Scopus)
13.	Eiji Hase, Takeo Minamikawa, Takahiko Mizuno, Shuji Miyamoto, Ryuji Ichikawa, Yi-Da Hsieh, Kyuki Shibuya, Katsuya SATO, Yoshiaki Nakajima, Akifumi Asahara, Kaoru Minoshima, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Scan-less confocal phase imaging based on dual-comb microscopy, Optica, Vol.5, No.5, 634-643, 2018. (Summary) Confocal laser microscopy (CLM) is a powerful tool in life science research and industrial inspection because it offers two-dimensional optical sectioning or three-dimensional imaging capability with micrometer depth selectivity. Furthermore, scan-less imaging modality enables rapid image acquisition and high robustness against surrounding external disturbances in CLM. However, the objects to be measured must be reflective, absorptive, scattering, or fluorescent because the image contrast is given by the optical intensity. If a new image contrast can be provided by the optical phase, scan-less CLM can be further applied for transparent non-fluorescent objects or reflective objects with nanometer unevenness by providing information on refractive index, optical thickness, or geometrical shape. Here, we report scan-less confocal dual-comb microscopy offering a phase image in addition to an amplitude image with depth selectivity by using an optical frequency comb as an optical carrier of amplitude and phase with discrete ultra-multichannels. Our technique encodes confocal amplitude and phase images of a sample onto a series of discrete modes in the optical frequency comb with well-defined amplitude and phase to establish a one-to-one correspondence between image pixels and comb modes. The technique then decodes these images from comb modes with amplitude and phase. We demonstrate confocal phase imaging with milliradian phase resolution under micrometer depth selectivity on the millisecond timescale. As a proof of concept, we demonstrate the quantitative phase imaging of standing culture fixed cells and the surface topography of nanometer-scale step structures. Our technique for confocal phase imaging will find applications in three-dimensional visualization of stacked living cells in culture and nanometer surface topography of semiconductor objects. (Tokushima University Institutional Repository) ● Metadata: 113646 (Link to Publication Site) ● Publication site (DOI): 10.1364/OPTICA.5.000634 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85047275172 (Tokushima University Institutional Repository: 113646, DOI: 10.1364/OPTICA.5.000634, Elsevier: Scopus)
14.	Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Application of Scan-less Two-Dimensional Confocal Microscopy Based on a Combination of Confocal Slit With Wavelength/Space Conversion, IEEE Journal of Selected Topics in Quantum Electronics, Vol.25, No.1, 7101407, 2018. (Summary) Confocal laser microscope (CLM) has been widely used in the fields of the non-contact surface topography, biomedical imaging, and other applications, because the confocality gives two-dimensional (2D) optical-sectioning or three-dimensional (3D) imaging capability with the depth selectivity. Combination of line-focused CLM with one-dimensional (1D) spectral encoding CLM enables us to obtain the 2D confocal image without the need for the mechanical scanning. So-called scan-less 2D CLM is a unique imaging modality, however, there are no attempts to apply for practical application. In this paper, we constructed scan-less 2D CLM with the image acquisition time of 0.23 ms, the lateral resolution of 1.2 μm, the depth resolution of 2.4 μm, and apply it for different kinds of application to evaluate its practical potential. (Tokushima University Institutional Repository) ● Metadata: 113638 (Link to Publication Site) ● Publication site (DOI): 10.1109/JSTQE.2018.2869615 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85053132099 (Tokushima University Institutional Repository: 113638, DOI: 10.1109/JSTQE.2018.2869615, Elsevier: Scopus)
15.	Kyuki Shibuya, Hiroyuki Araki and Tetsuo Iwata : Photon-counting-based diffraction phase microscopy combined with single-pixel imaging, Japanese Journal of Applied Physics, Part 1 (Regular Papers & Short Notes), Vol.57, 042501, 2018. (Tokushima University Institutional Repository) ● Metadata: 115352 (Link to Publication Site) ● Publication site (DOI): 10.7567/JJAP.57.042501 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.7567/JJAP.57.042501 (Tokushima University Institutional Repository: 115352, DOI: 10.7567/JJAP.57.042501)
16.	Masatomo Yamagiwa, Takayuki Ogawa, Takeo Minamikawa, Dahi Ghareab Abdelsalam, Kyosuke Okabe, Noriaki Tsurumachi, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Real-Time Amplitude and Phase Imaging of Optically Opaque Objects by Combining Full-Field Off-Axis Terahertz Digital Holography with Angular Spectrum Reconstruction, Journal of Infrared, Millimeter and Terahertz Waves, Vol.39, No.6, 561-572, 2018. (Summary) Terahertz digital holography (THz-DH) has the potential to be used for non-destructive inspection of visibly opaque soft materials due to its good immunity to optical scattering and absorption. Although previous research on full-field off-axis THz-DH has usually been performed using Fresnel diffraction reconstruction, its minimum reconstruction distance occasionally prevents a sample from being placed near a THz imager to increase the signal-to-noise ratio in the hologram. In this article, we apply the angular spectrum method (ASM) for wavefront reconstruction in full-filed off-axis THz-DH because ASM is more accurate at short reconstruction distances. We demonstrate real-time phase imaging of a visibly opaque plastic sample with a phase resolution power of λ/49 at a frame rate of 3.5 Hz in addition to real-time amplitude imaging. We also perform digital focusing of the amplitude image for the same object with a depth selectivity of 447 μm. Furthermore, 3D imaging of visibly opaque silicon objects was achieved with a depth precision of 1.7 μm. The demonstrated results indicate the high potential of the proposed method for in-line or in-process non-destructive inspection of soft materials. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10762-018-0482-6 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85044753790 (DOI: 10.1007/s10762-018-0482-6, Elsevier: Scopus)
17.	Tetsuo Iwata, Takanori Taga and Takahiko Mizuno : FPGA-based photon-counting phase-modulation fluorometer and a brief comparison with that operated in a pulsed-excitation mode, Optical Review, Vol.25, No.1, 94-101, 2018. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-017-0401-4 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-017-0401-4 (DOI: 10.1007/s10043-017-0401-4)
18.	Kouki Ichihashi and Tetsuo Iwata : Numerical simulation of a metal diffraction grating-based SPR sensor with a water immersion lens, Optical Review, Vol.24, No.6, 668-676, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-017-0361-8 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-017-0361-8 (DOI: 10.1007/s10043-017-0361-8)
19.	Takeo Minamikawa, Yi-Da Hsieh, Kyuki Shibuya, Eiji Hase, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata and Takeshi Yasui : Dual-comb spectroscopic ellipsometry., Nature Communications, Vol.8, 610, 2017. (Summary) Spectroscopic ellipsometry is a means of investigating optical and dielectric material responses. Conventional spectroscopic ellipsometry is subject to trade-offs between spectral accuracy, resolution, and measurement time. Polarization modulation has afforded poor performance because of its sensitivity to mechanical vibrational noise, thermal instability, and polarization-wavelength dependency. We combine spectroscopic ellipsometry with dual-comb spectroscopy, namely, dual-comb spectroscopic ellipsometry. Dual-comb spectroscopic ellipsometry (DCSE). DCSE directly and simultaneously obtains the ellipsometric parameters of the amplitude ratio and phase difference between s-polarized and p-polarized light signals with ultra-high spectral resolution and no polarization modulation, beyond the conventional limit. Ellipsometric evaluation without polarization modulation also enhances the stability and robustness of the system. In this study, we construct a polarization-modulation-free DCSE system with a spectral resolution of up to 1.2 × 10(-5) nm throughout the spectral range of 1514-1595 nm and achieved an accuracy of 38.4 nm and a precision of 3.3 nm in the measurement of thin-film samples.Spectroscopic ellipsometry is an established technique to characterize the optical properties of a material. Here, Minamikawa et al. combine the method with dual-comb spectroscopy, which allows them to obtain ellipsometric parameters including the phase difference between s-polarized and p-polarized light. (Tokushima University Institutional Repository) ● Metadata: 112462 (Link to Publication Site) ● Publication site (DOI): 10.1038/s41467-017-00709-y (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 28931818 ● Search Scopus @ Elsevier (PMID): 28931818 ● Search Scopus @ Elsevier (DOI): 10.1038/s41467-017-00709-y (Tokushima University Institutional Repository: 112462, DOI: 10.1038/s41467-017-00709-y, PubMed: 28931818)
20.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Kaoru Minoshima, Takeshi Yasui and Tetsuo Iwata : Scan-less hyperspectral dual-comb single-pixel-imaging in both amplitude and phase., Optics Express, Vol.25, No.18, 21947-21957, 2017. (Summary) We have developed a hyperspectral imaging scheme that involves a combination of dual-comb spectroscopy and Hadamard-transform-based single-pixel imaging. The scheme enables us to obtain 12,000 hyperspectral images of amplitude and phase at a spatial resolution of 46 µm without mechanical scanning. The spectral resolution given by the data point interval in the frequency domain is 20 MHz and the comb mode interval is 100 MHz over a spectral range of 1.2 THz centered at 191.5 THz. As an initial demonstration of our scheme, we obtained spectroscopic images of a standard test chart through an etalon plate. The thickness of an absorptive chromium-coated layer on a float-glass substrate was determined to be 70 nm from the hyperspectral phase images in the near-infrared wavelength region. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.25.021947 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 29041485 ● Summary page in Scopus @ Elsevier: 2-s2.0-85029211610 (DOI: 10.1364/OE.25.021947, PubMed: 29041485, Elsevier: Scopus)
21.	Tetsuo Iwata and Takahiko Mizuno : High-speed, FPGA-based photon-counting fluorometer with high data-gathering efficiency, Measurement Science & Technology, Vol.28, No.7, 075501-8, 2017. (Tokushima University Institutional Repository) ● Metadata: 111812 (Link to Publication Site) ● Publication site (DOI): 10.1088/1361-6501/aa6b46 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/1361-6501/aa6b46 (Tokushima University Institutional Repository: 111812, DOI: 10.1088/1361-6501/aa6b46)
22.	Kouki Ichihashi, Tomoyuki Maehara, Yasuhiro Mizutani and Tetsuo Iwata : Proposal of a new optical system for prism-based surface-plasmon-resonance imaging, Optical Review, Vol.24, No.2, 156-164, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-017-0310-6 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-017-0310-6 (DOI: 10.1007/s10043-017-0310-6)
23.	Syota Tetsuno, Kyuki Shibuya and Tetsuo Iwata : Subpixel-shift cyclic-Hadamard microscopic imaging using a pseudo-inverse-matrix procedure, Optics Express, Vol.25, No.4, 3420-3432, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.25.003420 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OE.25.003420 (DOI: 10.1364/OE.25.003420)
24.	Makoto Ginya, Makoto Kimura and Tetsuo Iwata : Optical-rotatory-dispersion measurement approach using the nonlinear behavior of the geometric phase, Optics Express, Vol.25, No.4, 3024-3037, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.25.003024 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OE.25.003024 (DOI: 10.1364/OE.25.003024)
25.	Shuji Miyamoto, Eiji Hase, Takeo Minamikawa, Yi-Da Hsieh, Yasuhiro Mizurani, Tetsuo Iwata, Takeshi Yasui and Hirotsugu Yamamoto : Scan-Less Full-Field Confocal Microscopy by a Combination of Confocal Slit with Wavelength/Space Conversion, Journal of the Japan Society for Precision Engineering, Vol.82, No.7, 679-682, 2016. (Link to Publication Site) ● Publication site (DOI): 10.2493/jjspe.82.679 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.2493/jjspe.82.679 (DOI: 10.2493/jjspe.82.679)
26.	Yi-Da Hsieh, Shota Nakamura, Ghareab Dahi Abdelsalam, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Francis Hindle and Takeshi Yasui : Dynamic terahertz spectroscopy of gas molecules mixed with unwanted aerosol under atmospheric pressure using fibre-based asynchronous-optical-sampling terahertz time-domain spectroscopy., Scientific Reports, Vol.6, 28114, 2016. (Summary) Terahertz (THz) spectroscopy is a promising method for analysing polar gas molecules mixed with unwanted aerosols due to its ability to obtain spectral fingerprints of rotational transition and immunity to aerosol scattering. In this article, dynamic THz spectroscopy of acetonitrile (CH3CN) gas was performed in the presence of smoke under the atmospheric pressure using a fibre-based, asynchronous-optical-sampling THz time-domain spectrometer. To match THz spectral signatures of gas molecules at atmospheric pressure, the spectral resolution was optimized to 1 GHz with a measurement rate of 1 Hz. The spectral overlapping of closely packed absorption lines significantly boosted the detection limit to 200 ppm when considering all the spectral contributions of the numerous absorption lines from 0.2 THz to 1 THz. Temporal changes of the CH3CN gas concentration were monitored under the smoky condition at the atmospheric pressure during volatilization of CH3CN droplets and the following diffusion of the volatilized CH3CN gas without the influence of scattering or absorption by the smoke. This system will be a powerful tool for real-time monitoring of target gases in practical applications of gas analysis in the atmospheric pressure, such as combustion processes or fire accident. (Tokushima University Institutional Repository) ● Metadata: 112320 (Link to Publication Site) ● Publication site (DOI): 10.1038/srep28114 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 27301319 ● Summary page in Scopus @ Elsevier: 2-s2.0-84974831427 (Tokushima University Institutional Repository: 112320, DOI: 10.1038/srep28114, PubMed: 27301319, Elsevier: Scopus)
27.	Yi-Da Hsieh, Hiroto Kimura, Kenta Hayashi, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Hajime Inaba, Kaoru Minoshima, Francis Hindle and Takeshi Yasui : Terahertz frequency-domain spectroscopy of low-pressure acetonitrile gas by a Photomixing terahertz synthesizer referenced to dual optical frequency combs, Journal of Infrared, Millimeter and Terahertz Waves, Vol.37, No.9, 903-915, 2016. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10762-016-0277-6 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84965029481 (DOI: 10.1007/s10762-016-0277-6, Elsevier: Scopus)
28.	Takahiko Mizuno and Tetsuo Iwata : Hadamard-transform fluorescence-lifetime imaging, Optics Express, Vol.24, No.8, 8202-8213, 2016. (Tokushima University Institutional Repository) ● Metadata: 110171 (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.24.008202 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OE.24.008202 (Tokushima University Institutional Repository: 110171, DOI: 10.1364/OE.24.008202)
29.	Tetsuo Iwata, 米井一平 and 水谷康弘 : Phase-controlled Traveling-wave-type Ultrasonic Motor Driven in the Constant-Temperature Mode, Journal of the Japan Society for Precision Engineering, Vol.82, No.2, 180-185, 2016. (Summary) We propose a phase-controlled traveling-wave-type ultrasonic motor (USM) driven in the constant temperature mode. By setting the phase difference between two sinusoidal driving signals fed into USM zero, a thermally-equilibrium condition of USM is attained without rotation. We call such an operation mode idling. Because the resonance frequency of the USM depends on the temperature, the rotational speed is decreased with increasing the temperature, which has been made the frequency control of USM somewhat difficult. Unlike the conventional frequency-controlled USM, a phase-controlled one with idling is free from the temperature change and is controllable with ease. We have constructed a feedback loop system for the phase-controlled USM and evaluated its performance in comparison with the conventional frequency-controlled one. (Keyword) ultrasonic motor / phase difference control / constant temperature (Link to Publication Site) ● Publication site (DOI): 10.2493/jjspe.82.180 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204829238272 ● Search Scopus @ Elsevier (DOI): 10.2493/jjspe.82.180 (DOI: 10.2493/jjspe.82.180, CiNii: 1390001204829238272)
30.	Takeo Minamikawa, Kenta Hayashi, Tatsuya Mizuguchi, Yi-Da Hsieh, Dahi Ghareab Abdelsalam, Yasuhiro Mizurani, Hirotsugu Yamamoto, Tetsuo Iwata and Takeshi Yasui : Real-time determination of absolute frequency in continuous-wave terahertz radiation with a photocarrier terahertz frequency comb induced by an unstabilized femtosecond laser, Journal of Infrared, Millimeter and Terahertz Waves, Vol.37, No.5, 473-485, 2016. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10762-015-0237-6 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84953218857 (DOI: 10.1007/s10762-015-0237-6, Elsevier: Scopus)
31.	兼岡良樹, 坂下竜一, 水谷康弘 and Tetsuo Iwata : マイクロレンズアレイを用いた表面プラズモン共鳴による膜厚分布測定, Transactions of the JSME, Vol.81, No.832, 1-8, 2015. (Link to Publication Site) ● Publication site (DOI): 10.1299/transjsme.15-00291 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001205516721024 ● Search Scopus @ Elsevier (DOI): 10.1299/transjsme.15-00291 (DOI: 10.1299/transjsme.15-00291, CiNii: 1390001205516721024)
32.	Naoya Taki, Yasuhiro Mizutani, T. Kojima, H. Yamamoto, T. Kozawa and Tetsuo Iwata : Optical trapping of nanoparticles on a silicon subwavelength grating and their detection by an ellipsometric technique, International Journal of Optomechatronics, Vol.10, No.1, 24-31, 2015. (Link to Publication Site) ● Publication site (DOI): 10.1080/15599612.2015.1124475 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84958048683 (DOI: 10.1080/15599612.2015.1124475, Elsevier: Scopus)
33.	Kyuki Shibuya, Yasuhiro Mizutani and Tetsuo Iwata : Comparison of reconstructed images between ghost imaging and Hadamard-transform imaging, Optical Review, Vol.22, No.6, 897-902, 2015. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-015-0138-x (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-015-0138-x (DOI: 10.1007/s10043-015-0138-x)
34.	Takeshi Yasui, Ryuji Ichikawa, Yi-Da Hsieh, Kenta Hayashi, Harsono Cahyadi, Francis Hindle, Yoshiyuki Sakaguchi, Tetsuo Iwata, Yasuhiro Mizurani, Hirotsugu Yamamoto, Kaoru Minoshima and Hajime Inaba : Adaptive sampling dual terahertz comb spectroscopy using dual free-running femtosecond lasers, Scientific Reports, Vol.5, 10786, 2015. (Summary) Terahertz (THz) dual comb spectroscopy (DCS) is a promising method for high-accuracy, high-resolution, broadband THz spectroscopy because the mode-resolved THz comb spectrum includes both broadband THz radiation and narrow-line CW-THz radiation characteristics. In addition, all frequency modes of a THz comb can be phase-locked to a microwave frequency standard, providing excellent traceability. However, the need for stabilization of dual femtosecond lasers has often hindered its wide use. To overcome this limitation, here we have demonstrated adaptive-sampling THz-DCS, allowing the use of free-running femtosecond lasers. To correct the fluctuation of the time and frequency scales caused by the laser timing jitter, an adaptive sampling clock is generated by dual THz-comb-referenced spectrum analysers and is used for a timing clock signal in a data acquisition board. The results not only indicated the successful implementation of THz-DCS with free-running lasers but also showed that this configuration outperforms standard THz-DCS with stabilized lasers due to the slight jitter remained in the stabilized lasers. (Tokushima University Institutional Repository) ● Metadata: 114974 (Link to Publication Site) ● Publication site (DOI): 10.1038/srep10786 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 26035687 ● Summary page in Scopus @ Elsevier: 2-s2.0-84934883052 (Tokushima University Institutional Repository: 114974, DOI: 10.1038/srep10786, PubMed: 26035687, Elsevier: Scopus)
35.	Takeshi Yasui, Kenta Hayashi, Ryuji Ichikawa, Harsono Cahyadi, Yi-Da Hsieh, Yasuhiro Mizurani, Hirotsugu Yamamoto, Tetsuo Iwata, Hajime Inaba and Kaoru Minoshima : Real-time absolute frequency measurement of continuous-wave terahertz radiation based on dual terahertz combs of photocarriers with different frequency spacings, Optics Express, Vol.23, No.9, 11367-11377, 2015. (Summary) Real-time measurement of the absolute frequency of continuous-wave terahertz (CW-THz) radiation is required for characterization and frequency calibration of practical CW-THz sources. We proposed a method for real-time monitoring of the absolute frequency of CW-THz radiation involving temporally parallel, i.e., simultaneous, measurement of two pairs of beat frequencies and laser repetition frequencies based on dual THz combs of photocarriers (PC-THz combs) with different frequency spacings. To demonstrate the method, THz-comb-referenced spectrum analyzers were constructed with a dual configuration based on dual femtosecond lasers. Regardless of the presence or absence of frequency control in the PC-THz combs, a frequency precision of 1011 was achieved at a measurement rate of 100 Hz. Furthermore, large fluctuation of the CW-THz frequencies, crossing several modes of the PC-THz combs, was correctly monitored in real time. The proposed method will be a powerful tool for the research and development of practical CW-THz sources, and other applications. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.23.011367 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 25969231 ● Summary page in Scopus @ Elsevier: 2-s2.0-84943378238 (DOI: 10.1364/OE.23.011367, PubMed: 25969231, Elsevier: Scopus)
36.	Takahiko Mizuno, Seiji Nakao, Yasuhiro Mizutani and Tetsuo Iwata : Photon-counting 1.0 GHz-phase-modulation fluorometer, The Review of Scientific Instruments, Vol.86, No.4, 043110-9, 2015. (Summary) We have constructed an improved version of a photon-counting phase-modulation fluorometer (PC-PMF) with a maximum modulation frequency of 1.0 GHz, where a phase domain measurement is conducted with a time-correlated single-photon-counting electronics. While the basic concept of the PC-PMF has been reported previously by one of the authors, little attention has been paid to its significance, other than its weak fluorescence measurement capability. Recently, we have recognized the importance of the PC-PMF and its potential for fluorescence lifetime measurements. One important aspect of the PC-PMF is that it enables us to perform high-speed measurements that exceed the frequency bandwidths of the photomultiplier tubes that are commonly used as fluorescence detectors. We describe the advantages of the PC-PMF and demonstrate its usefulness based on fundamental performance tests. In our new version of the PC-PMF, we have used a laser diode (LD) as an excitation light source rather than the light-emitting diode that was used in the primary version. We have also designed a simple and stable LD driver to modulate the device. Additionally, we have obtained a sinusoidal histogram waveform that has multiple cycles within a time span to be measured, which is indispensable for precise phase measurements. With focus on the fluorescence intensity and the resolution time, we have compared the performance of the PC-PMF with that of a conventional PMF using the analogue light detection method. (Tokushima University Institutional Repository) ● Metadata: 110170 (Link to Publication Site) ● Publication site (DOI): 10.1063/1.4917196 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 25933844 ● Summary page in Scopus @ Elsevier: 2-s2.0-84928485692 (Tokushima University Institutional Repository: 110170, DOI: 10.1063/1.4917196, PubMed: 25933844, Elsevier: Scopus)
37.	Yoshiki Kaneoka, Nishigaki Kentaro, Yasuhiro Mizutani and Tetsuo Iwata : Precise measurement of the thickness of a dielectric layer on a metal surface by use of a modified Otto optical configuration, International Journal of Optomechatronics, Vol.9, No.1, 48-61, 2015. (Link to Publication Site) ● Publication site (DOI): 10.1080/15599612.2014.988386 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84920741781 (DOI: 10.1080/15599612.2014.988386, Elsevier: Scopus)
38.	Tetsuo Iwata, Hiroaki Uemura, Yasuhiro Mizutani and Takeshi Yasui : Double-modulation reflection-type terahertz ellipsometer for measuring the thickness of a thin paint coating, Optics Express, Vol.22, No.17, 20595-20606, 2014. (Summary) We constructed a double-modulation, reflection-type terahertz (THz) ellipsometer for precise measurement of the thickness of a paint film which is coated on a metal surface and which is not transparent to visible or mid-infrared light. The double-modulation technique enabled us to directly obtain two ellipsometric parameters, () and (), as a function of angular frequency, , with a single measurement while reducing flicker noise due to a pump laser. The bias voltage of a photoconductive antenna (PCA) used as a THz pulse emitter was modulated at 100 kHz, and a first lock-in amplifier (LA1) was connected to the output of an electro-optic (EO) signal-sampling unit. In addition, a wire-grid polarizer (WGP) was rotated at 100 Hz to conduct polarization modulation with a frequency of 200 Hz. The output signal from LA1 was fed into a second lock-in amplifier (LA2) that worked in synchronization with the rotating WGP (RWGP). By operating LA2 in a quadrature phase-detection mode, we were able to obtain in-phase and out-of-phase signals simultaneously, from which the two ellipsometric parameters for an isotropic sample could be derived at the same time while cancelling common-mode noise. The lower detection limit of the thickness measurement and the relative standard deviation (RSD) of a black paint film coated on an aluminum substrate were 4.3 µm and 1.4%, respectively. The possibility of determining all elements of the Jones matrix for an anisotropic material is also discussed. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.22.020595 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 25321264 ● Search Scopus @ Elsevier (PMID): 25321264 ● Search Scopus @ Elsevier (DOI): 10.1364/OE.22.020595 (DOI: 10.1364/OE.22.020595, PubMed: 25321264)
39.	Kouki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : Enhancement of the Sensitivity of a Diffraction Grating-Based Surface-Plasmon-Resonance Sensor Uitilizing the 1st- and the -2nd-Order Diffracted Lights, Optical Review, Vol.21, No.5, 728-731, 2014. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-014-0119-5 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-014-0119-5 (DOI: 10.1007/s10043-014-0119-5)
40.	Tetsuo Iwata, Shuji Yoshioka, Shota Nakamura, Yasuhiro Mizutani and Takeshi Yasui : Prediction of the Thickness of a Thin Paint Film by Applying a Modified Partial-Least-Squares-1 Method to Data Obtained in Terahertz Reflectometry, Journal of Infrared, Millimeter and Terahertz Waves, Vol.34, No.10, 646-659, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10762-013-0015-2 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10762-013-0015-2 (DOI: 10.1007/s10762-013-0015-2)
41.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Method using optical polarization for achieving low-voltage-driven ferroelectric memory devices, International Journal of Optomechatronics, Vol.7, No.4, 253-262, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1080/15599612.2013.819538 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84893865977 (DOI: 10.1080/15599612.2013.819538, Elsevier: Scopus)
42.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Photothermal Imaging for Single Nanoparticle Using Single Element Interferometer, International Journal of Optomechatronics, Vol.7, No.2, 96-104, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1080/15599612.2013.777822 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84877853199 (DOI: 10.1080/15599612.2013.777822, Elsevier: Scopus)
43.	Yasuhiro Mizutani, Kohta Shinagawa, Takahiko Mizuno and Tetsuo Iwata : Time-Between-Photons Method for Measuring Fluorescence Lifetimes, Optical Review, Vol.20, No.1, 1-6, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-013-0001-x (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-013-0001-x (DOI: 10.1007/s10043-013-0001-x)
44.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : All polarization properties of PLZT ferroelectric ceramics observed in two dimensional distributions under applied voltage by the Mueller matrix, Sensors and Actuators A: Physical, Vol.200, 37-43, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.sna.2012.11.023 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84885371574 (DOI: 10.1016/j.sna.2012.11.023, Elsevier: Scopus)
45.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : Phase-Modulation Fluorometer Using a Phase-Modulated Excitation Light Source, Optical Review, Vol.19, No.4, 222-227, 2012. (Tokushima University Institutional Repository) ● Metadata: 110169 (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-012-0033-7 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050302172854184448 ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-012-0033-7 (Tokushima University Institutional Repository: 110169, DOI: 10.1007/s10043-012-0033-7, CiNii: 1050302172854184448)
46.	Yasuhiro Mizutani, Akihiro Tsutsumi, Tetsuo Iwata and Yukitoshi Otani : Optically driven method for magnetically levitating diamagnetic material using photothermal effect, Journal of Applied Physics, Vol.111, No.2, 23909, 2012. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.3675182 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1063/1.3675182 (DOI: 10.1063/1.3675182)
47.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : A nanosecond gate-mode-driven silicon avalanche photodiode and its application to measuring fluorescence lifetimes of Ce-doped YAG ceramics, Measurement Science & Technology, Vol.23, No.3, 035501-8, 2012. (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/23/3/035501 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/23/3/035501 (DOI: 10.1088/0957-0233/23/3/035501)
48.	Yasuhiro Mizutani and Tetsuo Iwata : Thin Film Thickness Measurement by Surface Plasmon Resonance Using a Modified Otto's Configuration Combined with Ellipsometry, International Journal of Automation Technology (IJAT), Vol.5, No.2, 236-240, 2010. (Link to Publication Site) ● Publication site (DOI): 10.20965/ijat.2011.p0236 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-80355134251 (DOI: 10.20965/ijat.2011.p0236, Elsevier: Scopus)
49.	Tetsuo Iwata, Hiroshige Kiyoto, Yasuhiro Mizutani and Tsutomu Araki : Comparison of Pulsed-Excitation and Phase-Modulation Methods for Estimating Fluorescence Lifetime Values Using a Convolved-Autoregressive Model and a High-Gain Photomultiplier Tube, Optical Review, Vol.17, No.6, 513-518, 2010. (Keyword) convolved autoregressive model / fluorescence lifetime / phase modulation fluorometry / spectroscopic technique / instrumentation (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-010-0092-6 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1572543026071316736 ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-010-0092-6 (DOI: 10.1007/s10043-010-0092-6, CiNii: 1572543026071316736)
50.	Tetsuo Iwata and Yasuhiro Mizutani : Ellipsometric measurement technique for a modified Otto configuration used for observing surface-plasmon resonance, Optics Express, Vol.18, No.14, 14480-14487, 2010. (Summary) In order to carry out precise measurements of the thickness of a dielectric layer deposited on a metal surface, we have introduced an ellipsometric measurement technique (EMT) to the modified Otto's configuration (MOC) that is used for observing surface plasmon resonance (SPR). For that purpose, we have measured the thickness of the Au layer by the EMT at four different locations on an elliptic fringe pattern obtained from the MOC basing on a four-layer structure model: prism (BK7)-air-Ausubstrate (BK7). Then, we have measured that of a TiO(2) layer deposited on the Au layer by the EMT basing on a five-layer structure model: prism (BK7)-air-TiO(2)-Au-substrate (BK7). We have found experimentally that the combination of EMT and MOC is effective for measuring the thickness of the dielectric layer on the metal. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.18.014480 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 20639933 ● Summary page in Scopus @ Elsevier: 2-s2.0-84886952680 (DOI: 10.1364/OE.18.014480, PubMed: 20639933, Elsevier: Scopus)
51.	Tetsuo Iwata, Ritsuki Ito, Yasuhiro Mizutani and Tsutomu Araki : Autoregressive-Model-based Fluorescence-Lifetime Measurements by Phase-Modulation Fluorometry Using a Pulsed-Excitation Light Source and a High-Gain Photomultiplier Tube, Applied Spectroscopy, Vol.63, No.11, 1256-1261, 2009. (Summary) We propose a novel method for measuring fluorescence lifetimes by use of a pulsed-excitation light source and an ordinary or a high-gain photomultiplier tube (PMT) with a high-load resistor. In order to obtain the values of fluorescence lifetimes, we adopt a normal data-processing procedure used in phase-modulation fluorometry. We apply an autoregressive (AR)-model-based data-analysis technique to fluorescence- and reference-response time-series data obtained from the PMT in order to derive plural values of phase differences at a repetition frequency of the pulsed-excitation light source and its harmonic ones. The connection of the high-load resistor enhances sensitivity in signal detection in a certain condition. Introduction of the AR-model-based data-analysis technique improves precision in estimating the values of fluorescence lifetimes. Depending on the value of the load resistor and that of the repetition frequency, plural values of fluorescence lifetimes are obtained at one time by utilizing the phase information of harmonic frequencies. Because the proposed measurement system is simple to construct, it might be effective when we need to know approximate values of fluorescence lifetimes readily, such as in the field of biochemistry for a screening purpose. (Link to Publication Site) ● Publication site (DOI): 10.1366/000370209789806911 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19891834 ● Search Scopus @ Elsevier (PMID): 19891834 ● Search Scopus @ Elsevier (DOI): 10.1366/000370209789806911 (DOI: 10.1366/000370209789806911, PubMed: 19891834)
52.	Tetsuo Iwata, Hisashi Ochi and Tsutomu Araki : A Proposal of a Pseudo-Lock-in Light-Detection Scheme by Sinusoidal Modulation of Bias Voltages Applied to Two Dynodes in a Photomultiplier Tube, Measurement Science & Technology, Vol.20, No.6, 065901-8, 2009. (Keyword) light detection / pseudo-lock-in / modulation / photomultiplier tube / instrumentation / spectroscopic techniques / phase modulation fluorometry / VARIABLE-FREQUENCY PHASE / FLUOROMETER / AMPLIFIER (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/20/6/065901 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/20/6/065901 (DOI: 10.1088/0957-0233/20/6/065901)
53.	Tetsuo Iwata and Go Komoda : Measurements of Complex Refractive Indexes of Metals at Several Wavelengths by Frustrated Total Internal Reflection Due to Surface Plasmon Resonance, Applied Optics, Vol.47, No.13, 2386-2391, 2008. (Summary) By employing a modified Otto's configuration for measuring surface plasmon resonance that has been proposed by Bliokh and his coworkers [Appl. Phys. Lett.89, 021908 (2006)APPLAB0003-695110.1063/1.2220540] we have obtained complex refractive indices of metals at several wavelengths. We demonstrate that the configuration has high potential for obtaining dispersion relations of metal conductors in bulk samples as well as in thin films from the visible to the near-infrared wavelength region. Furthermore, we show that the configuration enables us to obtain the complex refractive indices of metals or a thickness or refractive index of a dielectric layer on the metal at different points simultaneously. We have constructed a measurement system and carried out basic experiments. The experimental results agreed well with numerically simulated values or published ones. (Link to Publication Site) ● Publication site (DOI): 10.1364/AO.47.002386 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 18449305 ● Summary page in Scopus @ Elsevier: 2-s2.0-50849122066 (DOI: 10.1364/AO.47.002386, PubMed: 18449305, Elsevier: Scopus)
54.	Tetsuo Iwata, Hironobu Shibata and Tsutomu Araki : A Deconvolution Procedure for Determination of a Fluorescence Decay Waveform Applicable to a Band-Limited Measurement System That Has a Time Delay, Measurement Science & Technology, Vol.19, No.1, 015601-9, 2008. (Keyword) deconvolution / fluorescence lifetime / extrapolation method / Fourier-transform phase-modulation fluorometer / Hilbert transform / delay time / data processing / PHASE-MODULATION FLUOROMETER / ELECTRON-MICROSCOPE / EXTRAPOLATION / WAVELENGTH (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/19/1/015601 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/19/1/015601 (DOI: 10.1088/0957-0233/19/1/015601)
55.	Takashi Yasuda, Tetsuo Iwata, Tsutomu Araki and Takeshi Yasui : Improvement of minimum paint film thickness for THz paint meters by multiple regression analysis, Applied Optics, Vol.46, No.30, 7518-7526, 2007. (Summary) We propose a numerical parameter fitting method to determine the time delay between two temporally overlapped echo pulses in terahertz (THz) tomography measurements. The method is based on multiple-regression analysis with the least-squares method and is applied to decrease the minimum paint film thickness for THz paint meters. Applying multiple-regression analysis to paint thickness measurements is five times more sensitive with regard to the minimum thickness than numerical Fourier deconvolution. We apply the proposed method to determine the optical thickness, geometrical thickness, and group refractive index of dry paint film and wet paint film. The proposed method is useful for decreasing the minimum thickness for a THz paint meter and other THz tomography measurements. (Link to Publication Site) ● Publication site (DOI): 10.1364/AO.46.007518 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17952191 ● Summary page in Scopus @ Elsevier: 2-s2.0-37549050538 (DOI: 10.1364/AO.46.007518, PubMed: 17952191, Elsevier: Scopus)
56.	Tetsuo Iwata, Akitaka Muneshige and Tsutomu Araki : Analysis of Data Obtained from a Frequency-Multiplexed Phase-Modulation Fluorometer Using an Autoregressive Model, Applied Spectroscopy, Vol.61, No.9, 950-955, 2007. (Summary) In order to derive plural values of fluorescence lifetimes simultaneously from a multi-component sample, we formulate a mathematical method for analyzing data obtained from a frequency-multiplexed phase-modulation fluorometer (FM-PMF) using an autoregressive (AR) model. Various parameter settings necessary for performing accurate data analysis based on the AR model are studied through numerical simulations. Measurement results of fluorescence lifetimes of real samples, 10 ppm quinine sulfate in 0.1 N H(2)SO(4), 10 ppm rhodamine 6G in ethanol, and their mixture with a volume ratio of 1:1, demonstrate that the proposed method works quite well. (Keyword) Algorithms / Computer Simulation / Data Interpretation, Statistical / Fluorometry / Microchemistry / Models, Chemical / Models, Statistical / Regression Analysis / Reproducibility of Results / Sensitivity and Specificity (Link to Publication Site) ● Publication site (DOI): 10.1366/000370207781745892 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17910791 ● Search Scopus @ Elsevier (PMID): 17910791 ● Search Scopus @ Elsevier (DOI): 10.1366/000370207781745892 (DOI: 10.1366/000370207781745892, PubMed: 17910791)
57.	Tetsuo Iwata, Hironobu Shibata and Tsutomu Araki : Extrapolation of Band-Limited Frequency Data Using an Iterative Hilbert-Transform Method and Its Application for Fourier-Transform Phase-Modulation Fluorometry, Measurement Science & Technology, Vol.18, No.1, 288-294, 2007. (Keyword) extrapolation method / Hilbert transform / Fourier-transform phase-modulation fluorometer / fluorescence lifetime / data processing / ELECTRON-MICROSCOPE (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/18/1/035 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/18/1/035 (DOI: 10.1088/0957-0233/18/1/035)
58.	Tetsuo Iwata and Shougo Maeda : Simulation of Absorption-Based Surface-Plasmon Resonance Sensor by Means of Ellipsometry, Applied Optics, Vol.46, No.9, 1575-1582, 2007. (Summary) Through numerical simulations, we point out that introduction of an ellipsometric measurement technique to an absorption-based surface-plasmon resonance (SPR) sensor enhances precision and sensitivity in measuring the imaginary part k of the complex refractive index of the sample. By measuring a pair of ellipsometric Delta-Psi parameters, instead of the conventional energy reflectance R(p) of p-polarized light in the Kretschmann optical arrangement, we can detect a small change of k that is proportional to that of the concentration of the sample, especially when k < 1. While one has difficulty in determining the value of k uniquely by the standard technique, when the thickness of Au under the prism is thin (20-30 nm), the ellipsometric technique (ET) overcomes the problem. Furthermore, the value of k and the thickness d(s) of the absorptive sample that is adsorbed on Au can be determined precisely. The ET based on the common-path polarization interferometer is robust against external disturbance such as mechanical vibration and intensity fluctuation of a light source. Although only the p-polarized light is responsible for the SPR phenomenon, we show that the introduction of the ET is significant for quantitative analysis. (Keyword) Absorption / Algorithms / Computer Simulation / Image Interpretation, Computer-Assisted / Models, Chemical / Refractometry / Surface Plasmon Resonance / Surface Properties (Link to Publication Site) ● Publication site (DOI): 10.1364/AO.46.001575 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17334451 ● Search Scopus @ Elsevier (PMID): 17334451 ● Search Scopus @ Elsevier (DOI): 10.1364/AO.46.001575 (DOI: 10.1364/AO.46.001575, PubMed: 17334451)
59.	福島修一郎, Takeshi Yasui, Tetsuo Iwata and Tsutomu Araki : レーザー誘起ナノ秒蛍光寿命マッピングによる歯の形成と老化の可視化, Transactions of the Japanese Society for Medical and Biological Engineering, Vol.44, No.4, 702-706, 2006. (Summary) The auto-fluorescence characteristics of human teeth change with age. AGEs (advanced glycation endproducts), which are a crosslink of collagen, are considered to be involved in the mechanisms that cause the fluorescence characteristics to change. Although fluorescence intensity is a well-examined index of aging, it has inherent limitations. In contrast, fluorescence lifetime is useful for the evaluation because it can be reviewed quantitatively. Therefore, we mapped the distribution of fluorescence lifetime of teeth in relation to the formation and aging of teeth. The fluorescence decay profile of teeth was measured by time-correlated single photon counting, and lifetime was calculated from the fitting curve of the decay profile in a two-component exponential function. As a result, the distribution of fluorescent lifetime in dentin corresponded to tooth development; fluorescent lifetime of the crown dentin was shorter than that of the root dentin. Furthermore, the fluorescence lifetime decreased as human age increased. Because these changes in fluorescent lifetime are attributed to the accumulation of AGEs, whose fluorescence lifetime is short, our mapping of fluorescent life visualizes the formation and aging of teeth. (Keyword) Human dentin / auto-fluorescence / fluorescence lifetime / imaging / aging (Link to Publication Site) ● Publication site (DOI): 10.11239/jsmbe.44.702 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282680244630144 ● Search Scopus @ Elsevier (DOI): 10.11239/jsmbe.44.702 (DOI: 10.11239/jsmbe.44.702, CiNii: 1390282680244630144)
60.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Construction of a Pseudo-Lock-in Light Detection System Using a Gain-Enhanced Gated Silicon Avalanche Photodiode, Measurement Science & Technology, Vol.16, No.12, 2453-2458, 2005. (Summary) アバランシェフォトダイードをゲート動作をさせることによって，通常よりもゲインがエンハンスされた擬似ロックイン光検出システムが構築できることを示した． (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/16/12/008 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/16/12/008 (DOI: 10.1088/0957-0233/16/12/008)
61.	Tetsuo Iwata, Hironobu Shibata and Tsutomu Araki : Construction of a Fourier-Transform Phase-Modulation Fluorometer, Measurement Science & Technology, Vol.16, No.11, 2351-2356, 2005. (Summary) 筆者が初めて提案したフーリエ変換型位相変調蛍光寿命計の構築と評価を行った． (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/16/11/029 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/0957-0233/16/11/029 (DOI: 10.1088/0957-0233/16/11/029)
62.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : ゲート動作アバランシェフォトダイオードを用いた高感度反射型パルスオキシメータ, Transactions of the Japanese Society for Medical and Biological Engineering, Vol.43, No.4, 724-729, 2005. (Summary) We propose a reflection-type pulse oximeter that employs two pairs of a light-emitting diode (LED) and a gated avalanche photodiode (APD). One LED radiates a red line with an emission wavelength of 635 nm and the other a near-infrared line with 945 nm. These are driven with a pulse current at frequency f (=10 kHz). Superposition of a transistor-transistor-logic (TTL) gate pulse on a direct-current (dc) bias, which is set so as not to exceed the breakdown voltage of each APD, makes the APD work in a gain-enhanced operation mode. Each APD is gated at frequency 2f (=20 kHz), and the signal output is fed into a laboratory-made lock-in amplifier that works synchronously with the pulse modulation signal of each LED at frequency f (=10 kHz). A combination of the gated APD and lock-in like signal detection scheme is useful for the reflection-type pulse oximeter owing to the capability of detecting a weak signal against a large background light. (Keyword) reflection-type pulse oximeter / avalanche photodiode / lock-in light detection (Link to Publication Site) ● Publication site (DOI): 10.11239/JSMBE.43.724 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282680244670720 ● Search Scopus @ Elsevier (DOI): 10.11239/JSMBE.43.724 (DOI: 10.11239/JSMBE.43.724, CiNii: 1390282680244670720)
63.	Tetsuo Iwata and Tsutomu Araki : Phase-Modulation Fluorometer Using a Dynode-Voltage Burst-Modulated Photomultiplier-Tube, Applied Spectroscopy, Vol.59, No.8, 1049-1053, 2005. (Summary) 光電子増倍管のダイノード電圧をバースト状に正弦波変調するという新規な位相変調蛍光寿命計の考案·試作·評価を行った． (Link to Publication Site) ● Publication site (DOI): 10.1366/0003702054615151 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16105215 ● Search Scopus @ Elsevier (PMID): 16105215 ● Search Scopus @ Elsevier (DOI): 10.1366/0003702054615151 (DOI: 10.1366/0003702054615151, PubMed: 16105215)
64.	Tetsuo Iwata, 今本洋平, 荒木勉 and 内田照雄 : キセノンランプの直接電流変調, Journal of the Spectroscopical Society of Japan, Vol.53, No.3, 177-181, 2004. (Summary) 通常は直流点灯させるのが常識のキセノンランプを正弦波振幅変調させる手法を考案·試作し，周波数特性を調べた．このような光源とロックイン光検出手法を併用すれば，小型，安価の汎用分光計測システムが構築できることを示した． (Keyword) Xenon lamp / light source / modulation / spectroscopic instrument (Link to Publication Site) ● Publication site (DOI): 10.5111/bunkou.53.177 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001206259574784 ● Search Scopus @ Elsevier (DOI): 10.5111/bunkou.53.177 (DOI: 10.5111/bunkou.53.177, CiNii: 1390001206259574784)
65.	Tetsuo Iwata, Takafumi Inoue and Tsutomu Araki : Pseudo-Lock-in Light Detection Method for a Sinusoidally-Gain-Modulated Photomultiplier Tube, Optical Review, Vol.11, No.1, 19-23, 2004. (Summary) 光電子増倍管のダイノード電圧を正弦波変調させ，出力部にそれと同期して動作する簡易ロックイン方式のアンプを接続して微弱光を検出するf-2f方式能動型光検出器を考案·試作した．評価実験の結果，当初の目的が達成できていることを確認した． (Keyword) photomultiplier tube / lock-in amplifier / modulation / spectroscopic instruments (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-004-0019-1 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1570291225163981312 ● Summary page in Scopus @ Elsevier: 2-s2.0-2442675417 (DOI: 10.1007/s10043-004-0019-1, CiNii: 1570291225163981312, Elsevier: Scopus)
66.	Tetsuo Iwata, Tsuyoshi Takasu and Tsutomu Araki : Simple Photomultiplier-Tube Internal-Gating Method for Use in Subnanosecond Time-Resolved Spectroscopy, Applied Spectroscopy, Vol.57, No.9, 1145-1150, 2003. (Summary) 光電子増倍管の2つのダイノードに幅の狭いゲートパルスを同時に印加するだけで，そのパルス幅から該当ダイノード間の電子走行時間を引き算した値の分解時間が達成可能な，光電子増倍管内部ゲート法を考案した．評価実験の結果，0.3 nsの分解時間が達成されていることが確認できた．これはこの種のゲート手法の中では最高の値である． (Keyword) Amplifiers, Electronic / Equipment Design / Equipment Failure Analysis / Optics and Photonics / Photochemistry / Reproducibility of Results / Sensitivity and Specificity / Spectrum Analysis / Transducers (Link to Publication Site) ● Publication site (DOI): 10.1366/00037020360696017 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 14611045 ● Search Scopus @ Elsevier (PMID): 14611045 ● Search Scopus @ Elsevier (DOI): 10.1366/00037020360696017 (DOI: 10.1366/00037020360696017, PubMed: 14611045)
67.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Correction of the Intensity-Dependent Phase Delay in a Silicon Avalanche Photodiode by Controlling Its Reverse Bias Voltage, IEEE Journal of Quantum Electronics, Vol.39, No.7, 919-923, 2003. (Summary) アバランシェフォトダイオードの応答時間に入射光強度依存性があることを指摘し，その原因を考察するとともに，逆バイアス電圧を適切に制御することにより，応答速度の入射光強度依存性を補正できることを実験的に示した． (Keyword) avalanche phatodiode / gain-bandwidth product / intensity-dependent phase delay / phase correction / HE-NE-LASER / INTERMODE-BEAT / GERMANIUM (Link to Publication Site) ● Publication site (DOI): 10.1109/JQE.2003.813185 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1570572701789968256 ● Search Scopus @ Elsevier (DOI): 10.1109/JQE.2003.813185 (DOI: 10.1109/JQE.2003.813185, CiNii: 1570572701789968256)
68.	Tetsuo Iwata, 大谷浩史 and 須崎寛則 : 二次元DCMP法によるGPS用十字形状アレーアンテナの指向性パターンの形成, 高速信号処理応用技術学会誌(電子技術), Vol.6, No.2, 10-15, 2003. (Summary) 二次元アレーアンテナにDCMP (Directionally Constrained Minimization Power) 法を適用するアルゴリズムを構築し，GPS受信のマルチパス問題に対応できる可能性があることを実証した．さらに，アンテナ素子間の干渉の低減などを考慮して，十字形状のアレーアンテナの提案とシミュレーションを行った． (Keyword) GPS / two-dimensional array antenna / cross-shaped array antenna / DCMP method / data processing (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520291855893351936 (CiNii: 1520291855893351936)
69.	Tetsuo Iwata : Proposal for Fourier-Transform Phase-Modulation Fluorometer, Optical Review, Vol.10, No.1, 31-37, 2003. (Summary) 従来，位相変調蛍光寿命法では蛍光減衰波形の取得は原理的に不可能であったが，励起光の変調波長をある周波数範囲で高速掃引させることにより，これを可能にする手法を考案した．この手法をフーリエ変換型位相変調蛍光寿命測定法と命名し，実際にプロトタイプを製作してその有効性を確認した． (Keyword) Fourier-transform phase-modulation fluorometer / fluorescence lifetime / multi-component / instrumentation (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-003-0031-x (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1573387451548085632 ● Summary page in Scopus @ Elsevier: 2-s2.0-0037270059 (DOI: 10.1007/s10043-003-0031-x, CiNii: 1573387451548085632, Elsevier: Scopus)
70.	Tetsuo Iwata, Toshiki Tanaka, Tsutomu Araki and Teruo Uchida : Externally Controlled Nanosecond Xe Discharge Lamp Equipped with a Synchronous High-Voltage Power Supply Using an Automobile Ignition Coil, The Review of Scientific Instruments, Vol.73, No.9, 3165-3169, 2002. (Summary) 自動車用イグニションコイルを用いて高電圧パルスを発生させ，それを整流·充電することで直流高電圧を得る方式のデジタル制御高圧電源を考案した．そして，それをナノ秒パルス点灯Xeランプの電源として使用し，さらに高電圧半導体スイッチを用いて外部制御方式のナノ秒白色光源を実現した． (Link to Publication Site) ● Publication site (DOI): 10.1063/1.1499535 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-18544380210 (DOI: 10.1063/1.1499535, Elsevier: Scopus)
71.	Tetsuo Iwata, Tsuyoshi Takasu, Tsuyoshi Miyata and Tsutomu Araki : Combination of a Gated Photomultiplier Tube and a Phase Sensitive Detector for Use in an Intensive Pulsed Background Light Situation, Optical Review, Vol.9, No.1, 18-24, 2002. (Summary) 高強度のバックグラウンド光に重畳した信号光を検出する目的で，光検出器である光電子増倍管に内部ゲート動作をさせ，出力部にゲート動作と同期して動作する位相敏感検波回路を配置した微弱光検出方式を考案した．実際に試作を行い，当初の目的性能を得た． (Keyword) gated photomultiplier tube / phase sensitive detector / multi-white LED / spectroscopic techniques / instrumentation (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-002-0018-z (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1571135649792908160 ● Summary page in Scopus @ Elsevier: 2-s2.0-0035997782 (DOI: 10.1007/s10043-002-0018-z, CiNii: 1571135649792908160, Elsevier: Scopus)
72.	Tetsuo Iwata, Yoji Goto and Hironori Susaki : Application of the Multiple Signal Classification (MUSIC) method for One-Pulse Burst-Echo Doppler Sonar Data, Measurement Science & Technology, Vol.12, No.12, 2178-2184, 2001. (Summary) 高分解能スペクトル推定法であるMUSIC法をドップラーソナーから得られるワンパルスバースト状信号に適用した．その結果，そのような短時間パルスの信号から，従来の手法では不可能な低速度の船速推定が可能であることを初めて示した． (Link to Publication Site) ● Publication site (DOI): 10.1088/0957-0233/12/12/320 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0035663085 (DOI: 10.1088/0957-0233/12/12/320, Elsevier: Scopus)
73.	Tetsuo Iwata, Akio Hori and Takeshi Kamada : Photon-Counting Phase-Modulation Fluorometer, Optical Review, Vol.8, No.5, 326-329, 2001. (Summary) 極微弱光に対応可能なフォトンカウンティングタイプの位相変調型蛍光寿命計を始めて考案し，提案を行った．そして，実際に装置を設計·製作し，当初の予想通りの性能を得られることを確認した．さらに，発癌性物質として知られているベンゾピレンの蛍光寿命測定を行った． (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-001-0326-8 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-001-0326-8 (DOI: 10.1007/s10043-001-0326-8)
74.	佐藤隆宣, 須崎寛則, Tetsuo Iwata, 山本賢太郎, 小竹玉緒 and 伊永隆史 : マイクロチップを用いた蛍光検出型NO2モニタリング装置, The Transactions of The Institute of Electrical Engineers of Japan, Vol.121-E, No.9, 507-512, 2001. (Summary) 大気環境センサとして，石英マイクロチップ上に蛍光検出型のNO2モニタリング装置を設計·製作し，その評価を行った．光源は紫外LEDとし，NO2モニタのための蛍光試薬を開発した．
75.	Jun Koshoubu, Tetsuo Iwata and Shigeo Minami : Elimination of the Uninformative Calibration Sample Subset in the Modified UVE-PLS Method, Analytical Sciences, Vol.17, No.2, 319-322, 2001. (Summary) UVE-PLS法において，多変量解析用のデータとしての情報を殆ど有さない伽リブレーション用データセットを除去するアルゴリズムを考案し，その評価を行った．
76.	Tetsuo Iwata, Takeshi Kamada and Tsutomu Araki : Phase-Modulation Fluorometer Using an Ultraviolet Light-Emitting Diode, Optical Review, Vol.7, No.6, 495-498, 2000. (Summary) 紫外LEDを変調光源として用い，デジタルオシロスコープを信号記録装置として用いた位相変調型蛍光寿命測定システムを考案·構築し，基礎性能評価を行った．非常に簡便かつ安価なシステムであるが，ナノ秒オーダーの蛍光寿命が精度良く測定できることを示した． (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0034346169 (Elsevier: Scopus)
77.	Tetsuo Iwata, Toshiki Tanaka, Toshiyuki Komatsu and Tsutomu Araki : An Externally Controlled, Nanosecond-Pulsed, Xe Lamp Using a High Voltage Semiconductor Switch, The Review of Scientific Instruments, Vol.71, No.11, 4045-4049, 2000. (Summary) TTL制御可能な高電圧半導体スイッチを用いて，外部制御方式のナノ秒白色Xe光源を実現した．従来手法を使用するとすれば，サイラトロンのような真空管を使用する以外方法がなく，提案案手法によってXeランプのナノ秒パルス点灯の外部制御が非常に簡便に行えるようになった． (Link to Publication Site) ● Publication site (DOI): 10.1063/1.1321299 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0007319363 (DOI: 10.1063/1.1321299, Elsevier: Scopus)
78.	Tetsuo Iwata, 堀留知徳, Toshiyuki Komatsu and 荒木勉 : 自走放電型ナノ秒Xeパルス白色光源の空間過渡発光特性, 分光研究, Vol.49, No.5, 243-248, 2000. (Summary) 直流モードで使用されるキセノンランプを高速ナノ秒パルス点灯させたときの電極間の放電挙動が，万能投影機を用いて視覚化できるようにした．さらにこのシステムを用いて，放電の空間分解過渡発光特性を調べた．その結果，位置によって放電の時間的挙動が異なることを見出した．すなわち，空間的なマスクを用いれば，さらに短パルス光源が実現できることを示した．
79.	Toshiyuki Komatsu, Tetsuo Iwata and Tsutomu Araki : Reduction in Time Jitter for Free-Running, Nanosecond-Pulsed, Xe Lamp by Supplementary Illumination with Blue Light-Emitting Diode, The Review of Scientific Instruments, Vol.71, No.4, 1621-1626, 2000. (Summary) 通常，直流モードで使用されるキセノンランプを高速ナノ秒パルス点灯させる手法を考案したが，その際にキセノンランプの電極に青色LED光を照射すると，発光のジッターが低減される現象を見出した．このジッターの定量的な計測手法を考案し，照射光の波長依存性を調べた結果，電極表面での光電効果に起因していることをつきとめた． (Link to Publication Site) ● Publication site (DOI): 10.1063/1.1150507 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0041719050 (DOI: 10.1063/1.1150507, Elsevier: Scopus)
80.	Jun Koshoubu, Tetsuo Iwata and Shigeo Minami : Application of the Modified UVE-PLS Method for a Mid-Infrared Absorption Spectral Data Set of Water-Ethanol Mixtures, Applied Spectroscopy, Vol.54, No.1, 148-152, 2000. (Summary) 多変量解析手法の一つであるPLS法において，情報を有さない変数を除去するというUninformative Variable Elimination法を，スペクトルデータに適用することを前提として，推定精度を向上させるという観点で改良した．実際に中赤外の水·エタノール混合物スペクトルデータセットに適用して良好な結果が得られることを報告した． (Link to Publication Site) ● Publication site (DOI): 10.1366/0003702001948240 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0033887578 (DOI: 10.1366/0003702001948240, Elsevier: Scopus)
81.	Tetsuo Iwata, Jun Koshoubu, Yasuyuki Kurosu and Tsutomu Araki : Time-Resolved High-Performance Liquid Chromatography Fluorescence Detector Using a Nanosecond Pulsed Light Source for Detecting Lanthanide-Chelated Compounds, Journal of Chromatography. A, Vol.859, No.7, 13-21, 1999. (Summary) We have constructed a time-resolved fluorescence detection (TRFD) system for the analysis of amino compounds with high-performance liquid chromatography (HPLC) using lanthanide ion chelates. In order to carry out time-resolved measurements, we have employed a nanosecond pulsed xenon-arc lamp as an excitation light source. Amino compounds derivatized by isothiocyanobenzyl-EDTA (IEDTA) with the lanthanide chelate are mixed with an enhancer solution in a post-column manner and detected by TRFD. Taking advantage of a property of the long fluorescence lifetime of the lanthanide chelates, high selectivity against background fluorescence was achieved. In order to demonstrate the usefulness of TRFD, fundamental performance tests were carried out. Details of the system are also described. (Keyword) Chelating Agents / Chromatography, High Pressure Liquid / Metals, Rare Earth / Spectrometry, Fluorescence (Link to Publication Site) ● Publication site (DOI): 10.1016/S0021-9673(99)00826-2 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 10563411 ● Summary page in Scopus @ Elsevier: 2-s2.0-0032842964 (DOI: 10.1016/S0021-9673(99)00826-2, PubMed: 10563411, Elsevier: Scopus)
82.	Tetsuo Iwata : Simulation of a Zero-Dispersion Filter Monochromator for Image-Spectroscopic Measurements, Applied Optics, Vol.38, No.7, 1191-1195, 1999. (Summary) ダブルモノクロメータの水平方向と垂直方向の合成主点位置が一致するな位置に入射スリットと撮像素子を配置した全く新しいタイプのイメージング分光器のシミュレーションを行いその有効性を報告した．
83.	Tetsuo Iwata and Jun Koshoubu : Proposal for High-Resolution, Wide-Bandwidth, High-Optical-Throughput Spectroscopic System Using a Fabry-Perot Interferometer, Applied Spectroscopy, Vol.52, No.7, 1008-1013, 1998. (Summary) ファブリペロー干渉計と通常のフーリエ分光器，またはマルチチャネルフーリエ分光器，またはマルチチャネル検出器を装着した分散型回折格子分光器をタンデム接続した全く新しいタイプの，高分解能，広帯域，高オプティカルスループットの分光システムの提案とシミュレーションを行った．
84.	Tetsuo Iwata, Yasuyuki Kurosu and Jun Koshoubu : Electropherograms in Cappilary Zone Electrophoresis Plotted as a Function of the Quantity of Electric Charge, Journal of Chromatography. A, Vol.810, No.1-2, 183-191, 1998. (Summary) キャピラリー電気泳動のデータであるエレクトロフェログラムの横軸を，従来のリテンションタイムの代わりに電荷量でプロットし，分離ピークの積分値を計算できるようにした．この提案によって，定性定量分析の精度が向上することを実証した． (Link to Publication Site) ● Publication site (DOI): 10.1016/S0021-9673(98)00200-3 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0345698892 (DOI: 10.1016/S0021-9673(98)00200-3, Elsevier: Scopus)
85.	小勝負純, 大久保優晴 and Tetsuo Iwata : 多変量解析 - 近赤外分光法による塗料用樹脂の水酸基価と酸価の同時定量, Bunseki Kagaku, Vol.47, No.1, 3-7, 1998. (Summary) ポリエステル系ポリマー塗料樹脂の水酸基価と酸価の同時定量を目的として，近赤外透過スペクトル測定と多変量解析を行った．近赤外透過スペクトル測定においては，拡散透過の理論式を用いる際に，試料表面での反射ロスの補正を行った後，吸収係数を波数の関数として取り扱って試料内部で散乱補正が必要であることを示した．
86.	Tetsuo Iwata and Hideo Hisada : Proposal for Aberration-Corrected Imaging Spectrograph, Applied Optics, Vol.36, No.10, 7114-7118, 1997. (Summary) ダブルモノクロメータの水平方向と垂直方向の合成主点位置が一致するような条件を見出し，そこにそれぞれ入射スリットと撮像素子を配置することにより，非点収差やコマ収差が除去された新しいタイプの収差補正分光器が構成できることを初めて提案し，さらに光線追跡手法によって確認した．
87.	Tetsuo Iwata, Masaaki Senda, Yasuyuki Kurosu, Akio Tsuji and Masako Maeda : Construction of Time-Resolved Fluorescence Detector for Amino Compounds after High Performance Liquid Chromatography Using Europium Chelate, Analytical Chemistry, Vol.69, No.10, 1861-1865, 1997. (Summary) サブミリ秒という長い寿命，高い量子効率，大きなストークスシフトを有する遅延蛍光性物質ユーロピウムキレート化合物の特性に着目して，タンパク，アミノ酸類の高感度，高選択性分析を目的とした高速液体グラフィー用時間分解蛍光検出器を考案し，実際に試作，評価を行った． (Link to Publication Site) ● Publication site (DOI): 10.1021/ac961224w (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0001182354 (DOI: 10.1021/ac961224w, Elsevier: Scopus)
88.	Tetsuo Iwata, Jun Koshoubu, Jin Chihiro and Ohkubo Yusei : Temperature Dependence of the Mid-Infrared OH Spectral Band in Liquid Water, Applied Spectroscopy, Vol.51, No.9, 1269-1275, 1997. (Summary) 水は簡単な分子構造をしているにもかかわらず，その液体構造は複雑であり特異な物理化学的性質を示す．これは水素結合の温度依存性に起因しているとの観点から，赤外全反射分光法を用いてOH伸縮振動バンドの温度依存性の詳細な測定と解析を行った．
89.	Tetsuo Iwata and 小勝負純 : 赤外フーリエ分光法における光導電型MCT検出器の非線形性補正, 分光研究, Vol.46, No.3, 112-117, 1997. (Summary) 赤外フーリエ分光法における光導電型MCT検出器は，入射光量が大きくなると非線形応答を示し，スペクトル中に擬似ピークが現れる．入射光量を制限するとSN比の低下をもたらす．この問題を，検出器の周波数特性を考慮した数学的な非線形最適化問題として取り扱うことにより解決できることを始めて示した．
90.	Tetsuo Iwata and 小勝負純 : 反射スペクトルからのK-K変換による光学定数の算出誤差, 分光研究, Vol.45, No.3, 138-144, 1996. (Summary) 反射スペクトルからクラマース·クローニッヒ変換によって試料固有の光学定数スペクトルを取得する場合に，外部反射，内部反射，全反射といった光学的測定配置と入射光の偏光状態が最終結果に及ぼす影響について詳細なシミュレーションを行った．これまでこのような検討はあまりなされていなかったが，実用に際して有益な知見が得られた．
91.	Tetsuo Iwata and Jun Kosyoubu : Minimization of Noise in Spectral Data, Applied Spectroscopy, Vol.50, No.6, 747-752, 1996. (Summary) 既に報告した「行列の特異値分解を用いたノイズ除去アルゴリズム」を，一般的な連続スペクトルにも適用できるように拡張し，その有効性を示した．
92.	Tetsuo Iwata and 小勝負純 : スペクトルデータのPLS法における前処理について, Bunseki Kagaku, Vol.45, No.1, 85-89, 1996. (Summary) Partial Least Squares 法を用いてスペクトルデータ多変量解析を行うための，前処理手法について詳細な検討を行った．その結果，各種パラメータ設定に関して有効な指針が得られた．
93.	Tetsuo Iwata and Jun Kosyoubu : Curve Resolution of Highly-Overlapping Lorentzian Peaks Based on the Autoregressive Model, Journal of the Spectroscopical Society of Japan, Vol.44, No.6, 321-327, 1995. (Summary) スペクトル波形にフーリエ変換を施し，自己回帰モデルを適用することにより，高度にオーバーラップしたローレンツ型スペクトル波形を分離するアルゴリズムの提案と検証を行った． (Link to Publication Site) ● Publication site (DOI): 10.5111/bunkou.44.321 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.5111/bunkou.44.321 (DOI: 10.5111/bunkou.44.321)
94.	Tetsuo Iwata and Yasuyuki Kurosu : Enhancement of the Sensitivity and Resolution by Flow Counter-Balanced Capillary Electrophoresis, Analytical Sciences, Vol.11, No.2, 131-133, 1995. (Summary) キャピラリー電気泳動において，電気浸透流と反対方向にサイフォン法によって圧力を印加した．電気浸透流を低速になるように制御できるため，検出器からの出力信号の積分強度が稼げ，検出感度が向上する．一方，分離分解能は殆ど影響がないことを実験的に確認した．
95.	Tetsuo Iwata and 小勝負純 : マルチチャンネル検出器からのスペクトルデータのデコンボリューション, 分光研究, Vol.44, No.2, 74-78, 1995. (Summary) マルチチャンネル検出器によって取得されるスペクトルデータを対象とした分解能向上のためのデコンボリューションの問題提起を初めて行った．さらに，具体的なアルゴリズムの考案と検証結果を報告した．
96.	Tetsuo Iwata and Jun Kosyoubu : New Method to Eliminate the Background Noise form a Line Spectrum, Applied Spectroscopy, Vol.48, No.12, 1453-1456, 1994. (Summary) 行列の特異値分解の手法を用いて，輝線スペクトルに重畳しているバックグラウンドノイズを数値的に除去する全く新しい手法の提案を行った．実際のスペクトルデータに適用してその有用性を示した．
97.	Tetsuo Iwata and 小勝負純 : 多点インターフェログラムデータへのMEMとLOMEP法の適用, 分光研究, Vol.43, No.4, 214-219, 1994. (Summary) フーリエ分光において，MEM法とLOMEP (Line Shape Optimized Maximum Entropy Linear Prediction) 法の多点インターフェログラムデータへの適用について比較検討した．その際，多点インターフェログラムデータをデジタルフィルターにかけ，ヘテロダイン検波の手法を導入すれば，計算時間を大幅に短縮した高分解バンドスペクトルの推定が可能であることを示した．
98.	小勝負純 and Tetsuo Iwata : フーリエセルフデコンボリューション法に関する研究, 分光研究, Vol.42, No.4, 236-243, 1993. (Summary) フーリエセルフフーリエセルフデコンボリューション法を行うためにFIRO (Finite Impulse Response Operator)法が提案されていたが，この従来のFIRO法に対して計算時間の短縮を目的とした近似FIROフィルターの提案を行い，各種パラメータの詳細検討と応用を行った．
99.	Tetsuo Iwata : Macintosh/LabVIEWによる分光データの収集, 分光研究, Vol.42, No.1, 33-36, 1993. (Summary) 計測制御用の統合ソフトウェアであるMacintosh/LabVIEWの有用性に一早く着目し，分光データ収集システムの構築が可能であることを示した．
100.	Tetsuo Iwata and Gary M Hieftje : Simple Method to Measure the Coherence Time of a Mode-Locked Laser, Applied Spectroscopy, Vol.46, No.10, 1464-1468, 1992. (Summary) モードロックトピコ秒レーザのコヒーレンスタイムの簡便な計測手法を考案し，実際に測定システムを設計·製作してその有用性を確認した．空間的に作成した干渉縞を撮像素子で検出し，その可視度を算出するというのが基本原理である．
101.	Tetsuo Iwata, 藤原幹治 and 進士修 : デュアルフォトダイオードアレー検出器を用いた偏光CARSシステム, 分光研究, Vol.40, No.6, 358-366, 1991. (Summary) コヒーレントアンチストークスラマン散乱分光において問題となる非共鳴バックグラウンドを，偏光光検出手法を導入して抑制し，さらにデュアルフォトダイオードアレー検出器を用いて，リアルタイムでバックグラウンド補正されたスペクトルが取得可能なマルチプレックスCARSシステムを考案·設計·製作·評価を行った．
102.	Tetsuo Iwata : マルチチャンネルバーニアクロノトロンの分解時間の向上, 分光研究, Vol.37, No.2, 119-127, 1987. (Summary) マルチチャネルバーニアクロノトロン方式の蛍光寿命測定装置において，測定時間を増加させずに分解時間の向上する手法を考案し，実際に装置を設計·製作して動作確認を行った．
103.	Tetsuo Iwata, Uchida Teruo and Shigeo Minami : A Nanosecond Photon-Counting Fluorimetric System Using a Modified Multichannel Vernier Chronotron, Applied Spectroscopy, Vol.39, No.1, 101-109, 1985. (Summary) ナノ秒オーダーの微弱な蛍光減衰波形を高い効率で取得するために，光子列同時検出法を初めて提案し，マルチチャネルバーニアクロノトロン方式の蛍光寿命測定装置の考案·設計·製作·評価について報告した．
104.	Tetsuo Iwata, 桑田広治, 内田照雄 and 南茂夫 : 高周波再励起パルス動作ホローカソードランプの過渡発光特性, 分光研究, Vol.32, No.5, 318-327, 1983. (Summary) 通常，原子吸光用光源として用いられるホローカソードランプを高速大電流パルス動作させ，さらにバースト状高周波を重畳させて発光輝度の増大を図った．共鳴線とイオン線の過渡発光特性の差異を見出し，最終的にそれを利用した原子蛍光分析が可能であることを示した．
105.	Tetsuo Iwata, 内田照雄 and 南茂夫 : 高速光子計数回路評価用疑似フォトンパルス発生器の試作, 分光研究, Vol.32, No.4, 249-254, 1983. (Summary) 光子計数型高速時間分解測光システムの，製作·評価に不可欠なナノ秒ダブルパルスパルサーおよび微弱蛍光減衰波形エミュレーターの考案·設計·製作と評価を行い，その有用性を報告した．

Academic Paper (Unrefereed Paper):

1.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Hyperspectral single-pixel imaging with dual optical combs, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.10076, 100761C, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2251250 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85020300077 (DOI: 10.1117/12.2251250, Elsevier: Scopus)

Academic Letter:

1.	Yasuyuki Kurosu, Yasuyo Satou, Yoshiko Shisa and Tetsuo Iwata : Comparison of the Reproducibility in Migration Times between a Constant-Current and a Constant-Voltage Mode of Operation in Capillary Zone Electrophoresis, Journal of Chromatography. A, Vol.802, No.11, 391-394, 1998. (Summary) キャピラリー電気泳動には，定電圧モードと定電流モードの二種類の動作モードが存在している．しかし，定電圧モードで使用するのが一般的であった．本論文ではこの点に関して考察を行い，定電流モードでの分析が定量精度向上の観点では望ましいことを実験的に示した．
2.	Yasuyuki Kurosu, Tetsuo Iwata, Akio Tsuji and Masaki Maeda : Indirect Time-Resolved Fluorescence Detection of Both Non-Fluorescent and Fluorescent Compounds Separeted by High Performance Liquid Chromatography, Journal of Chromatography. A, Vol.787, No.1-2, 261-265, 1997. (Summary) 遅延蛍光性のユーロピウムキレートをバッファ溶液とした間接時間分解蛍光測定による高速液体クロマトグラフィーの提案を行い，非蛍光性試料の検出が可能であることを初めて示した． (Link to Publication Site) ● Publication site (DOI): 10.1016/S0021-9673(97)00622-5 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0030734287 (DOI: 10.1016/S0021-9673(97)00622-5, Elsevier: Scopus)

Review, Commentary:

1.	Eiji Hase, Takeo Minamikawa, Takahiko Mizuno, Katsuya SATO, Yoshiaki Nakajima, 浅原彰文, Kaoru Minoshima, Yasuhiro Mizurani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : スキャンレス光コム顕微鏡~光コムを用いたスキャンレス共焦点位相イメージング~, JAPANESE JOURNAL OF OPTICS, Vol.48, No.6, 227, Jun. 2019.
2.	Takeo Minamikawa, Yi-Da Hsieh, Kyuki Shibuya, Eiji Hase, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizurani, Hirotsugu Yamamoto, Tetsuo Iwata and Takeshi Yasui : Dual-comb spectroscopic ellipsometry, JAPANESE JOURNAL OF OPTICS, Vol.47, No.6, 242, Jun. 2018.
3.	Takeo Minamikawa, Sho Okubo, Hajime Inaba, Tetsuo Iwata and Takeshi Yasui : 光コムを用いた分光エリプソメトリー法, Optical Alliance, Vol.29, No.5, 53-58, May 2018. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1521136280613856512 (CiNii: 1521136280613856512)
4.	Kyuki Shibuya, Takeo Minamikawa, Takeshi Yasui and Tetsuo Iwata : 光コムを用いたスキャンレス超高密度ハイパースペクトルイメージング -デュアルコム分光とシングル・ピクセル・イメージングの融合-, OPTRONICS, Vol.36, No.10, 81-86, Oct. 2017.
5.	Eiji Hase, Takeo Minamikawa, Takahiko Mizuno, Katsuya SATO, Yoshiaki Nakajima, 浅原彰文, Kaoru Minoshima, Yasuhiro Mizurani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : 光コムを用いたスキャンレス共焦点位相イメージング, JAPANESE JOURNAL OF OPTICS, Vol.48, No.6, 227, Jun. 2016.
6.	Tetsuo Iwata, Hiroaki Uemura, Yasuhiro Mizutani and Takeshi Yasui : 塗装膜厚測定のための二重変調方式反射型THzエリプソメータ, 塗装工学, Vol.50, No.1, 13-24, Jan. 2015.
7.	Tetsuo Iwata : 2001年光学会の進展 4.分光, JAPANESE JOURNAL OF OPTICS, Vol.31, No.4, 390-391, Apr. 2002. (Summary) 2002年度の日本の光に関する講演，著作のうち，分光に関する内容について調査報告した．
8.	Tetsuo Iwata : 光による膜厚の計測, Jasco Report, Vol.33, No.8, 87-92, Aug. 1991. (Summary) 薄膜計測法を分類した後，エリプソメトリーの原理と応用について解説した．
9.	Tetsuo Iwata and Shiro Endo : Computer-Enhanced Fluorescence Spectroscopy, International Laboratory, No.9, 68-74, Sep. 1986. (Summary) コンピュータ制御方式の蛍光分光器のシステム構成について，主としてマルチタスクコンピュータソフトの観点から解説を行った．
10.	Tetsuo Iwata, 内田照雄 and 南茂夫 : 光子計数法を用いた過渡光計測装置, インターフェース, Vol.70, No.3, 171-185, Mar. 1983. (Summary) バーニアクロノトロン方式マルチチャネル光子計数型過渡発光計測装置の原理，装置の詳細について解説した．

Proceeding of International Conference:

1.	Masatomo Yamagiwa, Takeo Minamikawa, Clément Trovato, Hirotsugu Yamamoto, Takeshi Yasui, Yusuke Kawahito, Ryo Oe, Kyuki Shibuya, Takahiko Mizuno, Emmanuel Abraham, Yasuhiro Mizutani, Tetsuo Iwata, Kaoru Minoshima and Dahi Abdelsalam G. Ibrahim : Wide axial dynamic range digital holography using multicascade-linked synthetic wavelengths and optical wavelength10944-39, Proceedings of SPIE, Vol.10944, 10944-39, San Francisco, Feb. 2019. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2509354 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85068062795 (DOI: 10.1117/12.2509354, Elsevier: Scopus)
2.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Dual-comb-spectroscopic single-pixel Imaging with high frequency resolution and accuracy, Progress In Electromagnetics Research Symposium (PIERS) 2018, Toyama, Aug. 2018.
3.	Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto and Takeshi Yasui : Application of scan-less two-dimensional confocal microscopy achieved by a combination of confocal slit with wavelength/space conversion, Proceedings of SPIE, Vol.10711, 10711-55, Yokohama, Apr. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2318671 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85049258723 (DOI: 10.1117/12.2318671, Elsevier: Scopus)
4.	Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Yasuhiro Mizutani, Tetsuo Iwata, Tetsuo Iwata and Takeshi Yasui : Scan-less, line-filed, confocal phase imaging with dual-comb microscopy, Proceedings of SPIE, Vol.10711, 10711-69, Yokohama, Apr. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2317029 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85049249855 (DOI: 10.1117/12.2317029, Elsevier: Scopus)
5.	Kyuki Shibuya, Hiroyuki Araki, Shinya Adachi and Tetsuo Iwata : Single-pixel diffraction-phase microscopic imaging combined with photon counting, SPIE Photonics West BIOS, San Francisco (USA), Jan. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2288667 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85046340258 (DOI: 10.1117/12.2288667, Elsevier: Scopus)
6.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Takeshi Yasui and Tetsuo Iwata : Dual-comb single-pixel imaging in both amplitude and phase, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.10505, 10505-31, San Francisco, Jan. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2288709 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85047370814 (DOI: 10.1117/12.2288709, Elsevier: Scopus)
7.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Mode-resolved amplitude and phase imaging by dual-comb spectroscopy combined with a single-pixel imaging, 24th General Congress of International Commission for Optics, P3-03, Tokyo, Aug. 2017.
8.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Dual-comb single-pixel imaging for scan-less hyperspectral imaging, Conference on Lasers and Electro-Optics (CLEO) 2017, STh3L.5, San Jose, May 2017. (Link to Publication Site) ● Publication site (DOI): 10.1364/CLEO_SI.2017.STh3L.5 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85044176680 (DOI: 10.1364/CLEO_SI.2017.STh3L.5, Elsevier: Scopus)
9.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Hyperspectral single-pixel imaging with dual optical comb, SPIE Photonics West, Biomedical Optics (BiOS 2017), 10076-47, San Francisco, Feb. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2251250 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85020300077 (DOI: 10.1117/12.2251250, Elsevier: Scopus)
10.	Takeo Minamikawa, Yi-Da Hsieh, Kyuki Shibuya, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Dual-optical-comb spectroscopic ellipsometry, Conference on Lasers and Electro-Optics (CLEO) 2016, SW1H.5, San Jose, Jun. 2016. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85010702323 (Elsevier: Scopus)
11.	Kyuki Shibuya, Takuma Matsumoto, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Scan-less dual comb spectroscopic imaging with a single pixel detector, Conference on Lasers and Electro-Optics (CLEO) 2016, SM2I.2, San Jose, Jun. 2016. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85010700178 (Elsevier: Scopus)
12.	Tetsuo Iwata, Akihiro Sato and Takeshi Yasui : Direct measurement of the geometric phase of metal screw hole arrays in THz-TDS, EMN Meeting on Tearhertz Energy Materials Nanotechnology, 139, San Sebastian, Spain, May 2016.
13.	Kouki Ichihashi, Tomoyuki Maehara, Yasuhiro Mizutani and Tetsuo Iwata : Optical design and numerical simulations for an object-side-telecentric surface-plasmon-resonance microscope with a diffraction grating, 10th Onternational Conference on Optics-Photonics Design & Fabrication (ODF'16), Weingarten, Germany, Feb. 2016.
14.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : Proposal of a Hadamard-Transform Fluorescence-Lifetime Imaging Method, The 14th Conference on Methods and Applications in Fluorescence (MAF-14) Würzburg, Germany, Sep. 2015.
15.	Kyuki Shibuya, Yasuhiro Mizurani, Hirotsugu Yamamoto, Takeshi Yasui and Tetsuo Iwata : Optical Detection of Micro defect by single-pixel imaging, CLEO Pacific Rim 2015, 27I2-3, Busan, Aug. 2015. (Link to Publication Site) ● Publication site (DOI): 10.1109/CLEOPR.2015.7376458 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84962832712 (DOI: 10.1109/CLEOPR.2015.7376458, Elsevier: Scopus)
16.	Takeshi Yasui, Eiji Hase, Ryosuke Tanaka, Tetsuo Iwata, Shuichiro Fukushima and Tsutomu Araki : In situ visualization of dermal collagen dynamics during skin burn healing using second-harmonic-generation microscopy, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.9531, 95313U, Rio de Janeiro, May 2015. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2180895 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84938944863 (DOI: 10.1117/12.2180895, Elsevier: Scopus)
17.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Ohtani : Photothermal detection of single nanoparticle by using single element interferometer, CLEO 2015 Laser Science to Photonic Applications, San Jose Convention Center, San Jose, CA, USA, May 2015. (Link to Publication Site) ● Publication site (DOI): 10.1364/CLEO_SI.2015.STh3K.6 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84935425899 (DOI: 10.1364/CLEO_SI.2015.STh3K.6, Elsevier: Scopus)
18.	Yasuhiro Mizutani and Tetsuo Iwata : Ghost imaging and its potential application to dimensional measurement for the weak signal field, SPIE/COS Photonics Asia, Beijing, Oct. 2014.
19.	Kyuki Shibuya, Katsuhiro Nakae, Yasuhiro Mizutani and Tetsuo Iwata : Reduction effect of the accumulated number of ghost imaging by circulatory pattern, Proceedings of SPIE, Vol.9225, 4, Aug. 2014. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2061711 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84922721008 (DOI: 10.1117/12.2061711, Elsevier: Scopus)
20.	Tomoyuki Maehara, Koki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : Development of surface plasmon resonance microscope with gratings for nanocomposite dispersion state observation, EUSPEN, Dubrovnik, Croatia,, 4, Jun. 2014.
21.	Hiroaki Uemura, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : Measurements of the thickness of a paint film on a metal surface by a double-modulation terahertz ellipsometer, 14th EUSPEN, Dubrovnik, Croatia, Jun. 2014.
22.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Single nanoparticle imaging method based on photothermal effect by use of single element interferometer, International Conference on Optical Prticle Characterization, Tokyo, Mar. 2014.
23.	Koki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : Enhancement of the Sensitivity of a Diffraction Grating Based Surface Plasmon Resonance Sensor (G-SPRS) Utilizing Two Opposite Signed Different Diffraction Orders, 9th International Conference on Optics-photonics Design & Fabrication, Tokyo, Feb. 2014.
24.	Yasuhiro Mizutani, Naoya Taki, Tetsuo Iwata, Takao Kojima, Hiroki Yamamoto and Takahiro Kozawa : Optical-trapping-combinerd ellipsometer for evaluation of nanocomposite material, International Symposium on Optomechatoronic Technologies, Jeju, Korea, Oct. 2013.
25.	Emanuel Abraham, Mukesh Jewariya, Tetsuo Iwata, Tsutomu Araki and Takeshi Yasui : Fast 3D computed tomography using intense terahertz pulses, 38th International Conference on Infrared, Millimeter, and Terahertz Waves(IRMMW-THz2013), Mainz, Germany, Sep. 2013.
26.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Method for Single Nanoparticle Detection Using Single Element Interferometer, JSAP-OSA Joint Symposia 2013, 17p-D5-3, Kyoto, Sep. 2013.
27.	Naoya Taki, Yasuhiro Mizutani, Tetsuo Iwata, Takao Kojima, Hiroki Yamamoto and Takahiro Kozawa : Polarization detection of optical trapped nano-particles on anisotoropically-shaped sub-wavelength structure, The 6th International Conference on Spectroscopic Ellipsometry, 231, Kyoto, Jun. 2013.
28.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Low-voltage driven method of ferroelectric memory device using optical polarization property, ISOT 2012 International Symposium on Optomechatronic Technologies, Paris, Oct. 2012.
29.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Photothermal imaging for single nanoparticle using near-common path interferometer, ISOT 2012 International Symposium on Optomechatronic Technologies, Paris, Oct. 2012.
30.	Yuki Iyonaga, Yoshiyuki Sakaguchi, Shuko Yokoyama, Hajime Inaba, Kaoru Minoshima, Tetsuo Iwata, Takeshi Yasui and Tsutomu Araki : Improvement of spectral accuracy in asynchronous-optical-sampling THz time-domain spectroscopy by sweeping of mode-locked frequency in dual fiber lasers, 3rd EOS Meeting on Terahertz Science & Technology (TST2012), Praha, Jun. 2012.
31.	Tetsuo Iwata, Shuji Yoshioka, Shota Nakamura, Yasuhiro Mizutani and Takeshi Yasui : Prediction of a thickness of a paint film by applying a PLS1 method to data obtained in terahertz reflectometry, 3rd EOS Topical Meeting on Terahertz Science and Technology (TST2012), Praha, Jun. 2012.
32.	Yi-Da Hsieh, Yuki Iyonaga, Yoshiyuki Sakaguchi, Shuko Yokoyama, Hajime Inaba, Kaoru Minoshima, Tetsuo Iwata, Takeshi Yasui and Tsutomu Araki : Interpolation of frequency gaps between THz comb modes by precise tuning of laser mode-locked frequency, 3rd EOS Topical Meeting on Terahertz Science & Technology (TST2012), Praha, Jun. 2012.
33.	Makoto Ginya, Yasuhiro Mizutani and Tetsuo Iwata : All polarization properties of PLZT ferroelectric ceramics observed in two dimensional distributions under applied voltage by the Muller matrix, International Workshop on Piezoelectric Materials and Applications in Actuators 2012, 1aOB02, Hirosaki, Apr. 2012.
34.	Naoya Taki, Yasuhiro Mizutani, Tetsuo Iwata, Takao Kojima, Hiroki Yamamoto and Takahiro Kozawa : Ellipsometric detection of optical trapped nanoparticles by periodic localized light, Proceedings of SPIE, Vol.8430, 35, Brussels, Belgium, Apr. 2012. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.922879 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1117/12.922879 (DOI: 10.1117/12.922879)
35.	Shota Tanaka, Yasuhiro Mizutani and Tetsuo Iwata : Three-dimensional Surface Profile Measurement by Shape-from-focus Method Using MEMS Mirror Orojector, 26th Annual Meeting of the American Society for Precision Engineering, Denvor, USA, Nov. 2011.
36.	Yoshiki Kaneoka, Yasuhiro Mizutani and Tetsuo Iwata : Polarization measurements of surface plasmon - coupled emission (SPCE), ISOT 2011 International Symposium on Optomechatronic Technologies, 26, Hong Kong, China, Nov. 2011.
37.	Tetsuo Iwata, Yusuke Wada, Kentaro Nishigaki and Yasuhiro Mizutani : Two-dimensional thickness measurement of a dielectric thin layer on a metal by use of surface-plasmon-resonance-based ellipsometry, Proceedings of SPIE, Vol.8169, Marseille, France, Sep. 2011. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.896767 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-80355143408 (DOI: 10.1117/12.896767, Elsevier: Scopus)
38.	Tsuyoshi Miyata, Tetsuo Iwata, Susumu Nakayama and Tsutomu Araki : A Nanosecond-Gate-Mode-Driven Silicon-Avalanche-Photodiode and Its Application to Measuring Fluorescence, 12th Conference on Methods and Applications of Fluorescence MAF-12, Strasbourg, France, Sep. 2011.
39.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : Phase-modulation fluorometry using a phase-modulated light source, 12th Conference on Methods and Applications of Fluorescence MAF-12, P9, Strasbourg, France, Sep. 2011.
40.	Yasuhiro Mizutani, Takayuki Higuchi, Tetsuo Iwata and Yukitoshi Otani : Time-resolved oblique incidence interferometer for vibration analysis of rough surface, Proceedings of SPIE, Vol.8082, Munich, Germany, May 2011. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.889464 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84861087785 (DOI: 10.1117/12.889464, Elsevier: Scopus)
41.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and Otani Yukitoshi : Polarization Properties of PLZT Under Applied Voltage Measured by Dual-Rotating Retarder Polarimeter, International Conference on Optics in Precision Engineering and Nanotechnology (ICOPEN2011), Singapore, Mar. 2011.
42.	Takayuki Higuchi, Yasuhiro Mizutani, Tetsuo Iwata and Otani Yukitoshi : Stroboscopic Oblique-Incidence Interferometer for Motion Visualization of Stator of Ultrasonic Motor, International Conference on Optics in Precision Engineering and Nanotechnology (ICOPEN2011), Singapore, Mar. 2011.
43.	Yasuhiro Mizutani, Tetsuo Iwata and Yukitoshi Otani : Time-resolved vibrational surface profile measurement of ultrasonic motor using stroboscopic oblique incidence interferometer, Proceedings of SPIE, Vol.7855, Beijing, China, Nov. 2010. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.871749 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-78650910925 (DOI: 10.1117/12.871749, Elsevier: Scopus)
44.	Yasuhiro Mizutani, Tsutsumi Akihiro, Otani Yukitoshi and Tetsuo Iwata : Optically Driven Method for Magnetically Levitating a Diamagnetic Material Using the Photothermal Effect, ISOT 2010 International Symposium on Optomechatronic Technologies, A-5, Toronto, Canada, Oct. 2010.
45.	Yasuhiro Mizutani and Tetsuo Iwata : Thin film thickness measurement by surface prasmon resonance using modified Otto's configuration combined with ellipsometry, 10th international symposium on Measurement and Quality Control 2010, E5-064-1-E5-064-4, Osaka, Sep. 2010.
46.	Takeshi Yasui, Tetsuo Iwata and Tsutomu Araki : (Invited) Real-time terahertz color scanner, 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2010), Mo-C3.1, Rome, Italy, Sep. 2010.
47.	Tetsuo Iwata and Yasuhiro Mizutani : Comparison of a Pulsed-Excitation and a Phase-Modulation Method for Estimating Fluorescence Lifetimes Using a Convolved-Autoregressive Model and a High-Gain PMT, 30th European Congress on Molecular Spectroscopy with GISR 2010 (EUCMOS 2010), Florence Italy, Sep. 2010.
48.	Tetsuo Iwata : (Invited) UV Light-Emitting Diodes and Their Application to Phase Modulation Fluorometry, 11th Conference on Methods and Applications of fluorescence Spectroscopy, Imaging and Probes (MAF-11), Budapest, Hungary, Sep. 2009.
49.	Syuichiro Fukuskima, P. Mahakkanukrauh, Y. Tohno, Tetsuo Iwata and Tsutomu Araki : Hemodynamic Effect on Arterial Calcification, 3rd Switzerland-Japan Workshop on Biomechanics 2009 (SBJ2009), Engerberg, Swizerland, Sep. 2009.
50.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : A Reflection-Type Pulse Oximeter Using a Gain-Enhanced Gated Avalanche Photodiode, 4th Asian and Pacific Rim Symposium on Biophotonics 2009 (APBP2009), Jeju Island, South Korea, May 2009.
51.	Tetsuo Iwata and Hisashi Ochi : Pseudo-Lock-in Light-Detection System by Sinusoidal Modulation of Bias Voltages for Two Dynodes in a Photomultiplier Tube, 4th Asian and Pacific Rim Symposium on Biophotonics 2009 (APBP2009), Jeju Island, South Korea, May 2009.
52.	Hironobu Shibata and Tetsuo Iwata : A Precise Deconvolution Procedure for Deriving a Fluorescence Decay Waveform of a Biomedical Sample, 13th International Conference on Biomedical Engineering 2008, Singapore, Dec. 2008.
53.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : A Reflection-Type Pulse Oximeter Using Four Wavelengths Equipped with a Gain-Enhanced Gated-Avalanche-Photodiode, 13th International Conference on Biomedical Engineering 2008, Singapore, Dec. 2008.
54.	Ritsuki Ito, Akitaka Muneshige and Tetsuo Iwata : Analysis of Data Obtained from a Frequency-Multiplexed Phase-Modulation Fluorometer Using an Autoregressive Model, 3rd Asian and Pacific Rim Symposium on Biophotonics 2007, 85-86, Cairns, Australia, Jul. 2007.
55.	T Takahashi, M Ito, Takeshi Yasui, Tetsuo Iwata and Tsutomu Araki : Optical-Sectioning, Second-Harmonic-Generation Imaging of Dermal Collagen Fiber Using a Mode-Locked Cr:Forsterite Laser, 3rd Asian and Pacific Rim Symposium on Biophotonics 2007, 110-111, Cairns, Australia, Jul. 2007.
56.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Pulse Oximeter Using a Gain-Modulated Avalanche Photodiode Operated in a Pseudo-Lock-In Light Detection Mode, ICO XX 20th Congress of the International Comission for Optics, 116-117, Changchun, China, Aug. 2005.
57.	Hironobu Shibata and Tetsuo Iwata : Construction of a Fourier-Transform Phase-Modulation Fluorometer, ICO XX 20th Congress of the International Comission for Optics, 15-16, Changchun, China, Aug. 2005.
58.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Pulse Oximeter Using a Gated Avalanche Photodiode, Proc. 6th Asian-Pacific Conference on Medical and Biological Engineering (APCMBE 2005)(CD), PA-2-74, Tsukuba, Apr. 2005. (Summary) 二次元アレー状のドップラーソナーから得られる出力信号データに対して，不要波を抑圧しつつ信号波到来方向を予測するために，DCMP法とMUSIC法を繰り返し適用可能とするアルゴリズムを報告した．
59.	Makoto Nii, Tetsuo Iwata and Hironori Susaki : Consecutive Application of the MUSIC and the DCMP Method for Data Obtained from Arrayed Sonar Receivers for Optimizing the DOA Pattern, OCEANS'04 MTS/IEEE/TECHNO OCEAN'04 (OTO'04), 1175-1180, Kobe, Nov. 2004. (Summary) 二次元アレー状のドップラーソナーから得られる出力信号データに対して，不要波を抑圧しつつ信号波到来方向を予測するために，DCMP法とMUSIC法を繰り返し適用可能とするアルゴリズムを報告した． (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-19644364562 (Elsevier: Scopus)
60.	Takeshi Yasui, Takashi Yasuda, Tetsuo Iwata and Tsutomu Araki : Simultaneous Measurement of Thickness and Drying Process of Paint by Terahertz Electromagnetic Pulse, The 5th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2003), 480, Taipei, Dec. 2003.
61.	Tetsuo Iwata and Takafumi Inoue : Lock-in-Like Light Detection Method for a Gain-Modulated photomultiplier-Tube, The 5th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2003), 223, Taipei, Dec. 2003. (Summary) 光電子増倍管のダイノード電圧を正弦波変調させ，出力部にそれと同期して動作する簡易ロックイン方式のアンプを接続して微弱光を検出するf-2f方式能動型光検出器を考案·試作した．評価実験の結果，当初の目的が達成できていることを報告した．
62.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Temporal Emission Chracteristics of Pulse-Driven and Sinusoidally-Modulated White Light-Emitting Diodes, The 5th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2003), 645, Taipei, Dec. 2003. (Summary) 白色LEDを大電流パルス駆動させた場合と高周波正弦波変調駆動させた場合の，いくつかの波長における時間的な挙動の測定結果と応用の可能性について報告した．
63.	Katsuhisa Yamashina, Hironori Susaki, Osamu Arai, Yoji Goto and Tetsuo Iwata : Application of the 2D-MUSIC Method for ADR Data Obtained from GPS Receivers Aligned in Array, 2003 International Symposium on GPS/GNSS, 149-154, Tokyo, Nov. 2003. (Summary) アレー上に配置したGPSレシーバ群から得られるADRデータに，二次元MUSIC法を適用することにより，位置計測が実行できる可能性について報告した．
64.	Takeshi Yasui, Takashi Yasuda, Tetsuo Iwata and Tsutomu Araki : Simultaneous Monitoring of Thickness and Drying Process of Paint Film Based on Terahertz Electric Pulse, THz2003, Sendai, Sep. 2003. (Summary) テラヘルツ光によって得られた測定データに，データフィッティングアルゴリズムを適用して，自動車ボディの塗装膜の厚さが従来より薄い範囲まで計測できることを報告した．
65.	Yoji Goto, Tetsuo Iwata, Katsuhisa Yamashina and Hironori Susaki : Estimation of High Precision Carrier-Phase by Accumulated-Delta-Range (ADR) Data for Reduction of the Multipath Problem and Evaluation by 2D-MUSIC, ION GPS/GNSS 2003, 1098-1913, Portland, Sep. 2003. (Summary) GPSにおけるマルチパス軽減の目的で，衛星からの搬送波位相から得られるADRデータにMUSIC法を適用し，さらに二重補正のテクニックを導入して位置計測ができる可能性を報告した．
66.	Tsuyoshi Miyata, Youhei Imamoto, Tetsuo Iwata and Tsutomu Araki : Temporal Emission Characteristics of White Light-Emitting Diodes for High-Speed Pulsed Current, ICO XIX Optics for Quality of Life, 19th Congress of the International Commission for Optics (ICO19, 2002), Vol.4829, 695-696, Firenze, Aug. 2002. (Summary) 白色LEDを高速大電流パルス駆動させた場合の，青色励起光とそれより長波長の蛍光の過渡発光特性の差異について報告した．
67.	Tetsuo Iwata, Takeshi Kamada and Tsutomu Araki : Fourier-Transform Phase-Modulation Fluorometer, ICO XIX Optics for Quality of Life, 19th Congress of the International Commission for Optics (ICO19, 2002), Vol.4829, 883-884, Firenze, Aug. 2002. (Summary) 従来，位相変調蛍光寿命法では蛍光減衰波形の取得は原理的に不可能であったが，励起光の変調波長をある周波数範囲で高速掃引させることにより，これを可能にする手法を考案し報告した．
68.	Tetsuo Iwata, Akio Hori and Takeshi Kamada : Photon-Counting Phase-Modulation Fluorometer for Fluorescence Lifetime Measurements, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), 462-465, Yokohama, Jun. 2001. (Summary) 極微弱光に対応可能なフォトンカウンティングタイプの位相変調型蛍光寿命計を始めて考案し，提案を行った．そして，実際に装置を設計·製作し，当初の予想通りの性能を得られることを報告した．
69.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : Simple, Small-Sized, Lock-in Light Detection System Using a Gated Si Avalanche Photodiode, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), 444-447, Yokohama, Jun. 2001. (Summary) ゲート動作させたアバランシェフォトダイオードと位相敏感検出用ICを使用して，安価，簡便なロックイン光検出システムが構成できることを報告した．
70.	Teruo Uchida, Tetsuo Iwata, Kouzi Kuwata and Minami Shigeo : Application of Time-Resolved Photometry to Atomic Fluorescence Spectrochemicail Analysis, 9th Internatinal Conference onAtomic Spectroscopy and XXIIColloquium SpectroscopicumInternatinale, 161, Tokyo, Aug. 1981. (Summary) 通常，原子吸用光源として用いられるホローカソードランプを高速大電流パルス動作させ，さらにバースト状高周波を重畳させて発光輝度の増大を図った．共鳴線とイオン線の過渡発光特性の差異を見出し，最終的にそれを利用した原子蛍光分析が可能であることを報告した．

Proceeding of Domestic Conference:

1.	荒木洋之, 岩浅修平, 澁谷九輝 and Tetsuo Iwata : 二波長直交回折位相顕微鏡の検討, Optics&Photonics Japan2018, Nov. 2018.
2.	長谷悠樹 and Tetsuo Iwata : FPGAを用いた光子統計測定装置, Optics&Photonics Japan2018, Nov. 2018.
3.	宮内智大 and Tetsuo Iwata : OFDM励起光を用いた位相変調蛍光寿命計, Optics&Photonics Japan2018, Nov. 2018.
4.	多賀貴規, 水野孝彦 and Tetsuo Iwata : 連続遅延掃引型光電子パルス列同時検出方式蛍光寿命計, Optics&Photonics Japan2017, Oct. 2017.
5.	荒木洋之, 足立真弥, 澁谷九輝 and Tetsuo Iwata : 光子計数型シングルピクセル回折位相顕微鏡の提案, Optics&Photonics Japan2017, Oct. 2017.
6.	宮内智大, 多賀貴規, 水野孝彦 and Tetsuo Iwata : ランダム励起1ビット光子相関型蛍光寿命計, Optics&Photonics Japan2017, Oct. 2017.
7.	Takeo Minamikawa, Yi-Da Hsieh, Kyuki Shibuya, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizurani, Tetsuo Iwata and Takeshi Yasui : デュアル光コム分光法を用いた分光エリプソメトリーの開発, 2017年度精密工学会秋季大会学術講演会, P44, Sep. 2017.
8.	多賀貴規, 水野孝彦 and Tetsuo Iwata : 励起周波数掃引方式光子計数型位相変調方式蛍光寿測定計, 第78回応用物理学会秋季学術講演会, Sep. 2017.
9.	荒木洋之, 澁谷九輝 and Tetsuo Iwata : シングルピクセル回折位相顕微鏡の提案, 第78回応用物理学会秋季学術講演会予稿集, Sep. 2017.
10.	銀屋真 and Tetsuo Iwata : Jones N行列で表される系の極分解の検討, 第78回応用物理学会秋季学術講演会予稿集, Sep. 2017.
11.	長谷悠樹, 水野孝彦 and Tetsuo Iwata : 1ビット光子自己相関計による非同期方式蛍光寿命測定, 第78回応用物理学会秋季学術講演会予稿集, Sep. 2017.
12.	長谷悠樹, 水野孝彦 and Tetsuo Iwata : 1ビット光子自己相関計による蛍光寿命計, 第64回応用物理学会春季学術講演会, Mar. 2017.
13.	水野孝彦, 多賀貴規 and Tetsuo Iwata : 高効率光子計数型位相変調方式方式蛍光寿命計, Optics&Photonics Japan2016, Oct. 2016.
14.	水野孝彦, 多賀貴規 and Tetsuo Iwata : 高効率光電子パルス列同時検出方式蛍光寿命計, Optics&Photonics Japan2016, Oct. 2016.
15.	多賀貴規, 水野孝彦 and Tetsuo Iwata : 光子計数型位相変調方式蛍光寿命測定計の製作, Optics&Photonics Japan2016, Oct. 2016.
16.	鉄野翔太, Kyuki Shibuya and Tetsuo Iwata : 疑似逆行列を用いたサブピクセルシフト巡回型アダマールイメージング, Optics&Photonics Japan2016, Oct. 2016.
17.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : デュアルコム分光シングルピクセルイメージング, Optics&Photonics Japan2016, 1aE3, Oct. 2016.
18.	水野孝彦, 多賀貴規 and Tetsuo Iwata : FPGAを用いた高効率光電子パルス列同時検出方式蛍光寿命計, 第77回応用物理学会秋季学術講演会予稿集, Sep. 2016.
19.	鉄野翔太, 澁谷九輝 and Tetsuo Iwata : 疑似逆行列を用いたサブピクセルシフト巡回型アダマールイメージング, 第77回応用物理学会秋季学術講演会予稿集, Sep. 2016.
20.	多賀貴規, 水野孝彦 and Tetsuo Iwata : FPGAを用いた光子計数型位相変調方式蛍光寿命測定計の製作, 第77回応用物理学会秋季学術講演会予稿集, Sep. 2016.
21.	Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : スキャンレスデュアルコム分光イメージング法の提案, 第77回応用物理学会秋季学術講演会予稿集, 15p-C32-4, Sep. 2016.
22.	Shota Tetsuno, Kyuki Shibuya and Tetsuo Iwata : サブピクセルシフト巡回型アダマール変換イメージングにおけるデコンボリューション, 第63回応用物理学会春季学術講演会予稿集, Mar. 2016.
23.	Yoshiki Kaneoka, Takeshi Yasui and Tetsuo Iwata : SC光を用いた表面プラズモン共鳴分光エリプソメータ, 第63回応用物理学会春季学術講演会予稿集, 21p-P15-14, Mar. 2016.
24.	Takeo Minamikawa, Yi-Da Hsieh, Kyuki Shibuya, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : デュアル光コム分光エリプソメトリー, 第63回応用物理学会春季学術講演会予稿集, 21p-P15-8, Mar. 2016.
25.	Kyuki Shibuya, Takuma Matsumoto, Yasuhiro Mizurani, Tetsuo Iwata and Takeshi Yasui : スキャンレスデュアルコム分光イメージング法の提案, 第63回応用物理学会春季学術講演会予稿集, 21a-H116-7, Mar. 2016.
26.	Yi-Da Hsieh, Kyuki Shibuya, Yoshiki Kaneoka, Sho Okubo, Hajime Inaba, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : デュアル光コム分光エリプソメトリーに関する基礎研究, Optic & Photonics Japan 2015, 30pD1, Oct. 2015.
27.	Tomoyuki Maehara, 市橋宏基, 水谷康弘 and Tetsuo Iwata : グレーティング結合型SPRセンサによる屈折率の高感度測定, Optics & Photonics Japan 2015, Oct. 2015.
28.	Takahiko Mizuno and Tetsuo Iwata : 巡回アダマール励起パターンと単一検出器を用いた蛍光寿命イメージング法の提案, Optics & Photonics Japan 2015, Oct. 2015.
29.	Akihiro Sato, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : テラヘルツ周波数領域での幾何学的位相の直接測定, Optics & Photonics Japan 2015, P25, Oct. 2015.
30.	鉄野翔太, 澁谷九輝, Yasuhiro Mizutani and Tetsuo Iwata : 計算機ゴーストイメージングの高解像度化の検討(第1 報) サブピクセルシフトとデコンボリューションの適用, 2015年度精密工学会春季大会学術講演会, Mar. 2015.
31.	澁谷九輝, Yasuhiro Mizutani and Tetsuo Iwata : 近接場ゴーストイメージングによるナノ粒子マッピング法の開発, 2015年度精密工学会春季大会学術講演会, Mar. 2015.
32.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージング法の開発(第7 報)ナノ粒子の3 次元ポジションイメージング, 2015年度精密工学会春季大会学術講演会, Mar. 2015.
33.	水野孝彦, Yasuhiro Mizutani and Tetsuo Iwata : 相互相関に基づく蛍光寿命イメージング法の提案, 第61回応用物理学会春季学術講演会, Mar. 2015.
34.	兼岡良樹, Yasuhiro Mizutani and Tetsuo Iwata : 表面プラズモン結合発光を用いたワンショットエリプソメータ, Optics & Photonics Japan 2014, Nov. 2014.
35.	水野孝彦, Yasuhiro Mizutani and Tetsuo Iwata : 周波数変調光源を用いた光子計数型位相変調方式蛍光寿命計, Optics & Photonics Japan 2014, Nov. 2014.
36.	木村誠, Yasuhiro Mizutani and Tetsuo Iwata : 幾何学的位相の非線形挙動を利用した高感度旋光分散測定, Optics & Photonics Japan 2014, Nov. 2014.
37.	澁谷九輝, Yasuhiro Mizutani and Tetsuo Iwata : 循環パターンゴーストイメージング顕微鏡による生体イメージングの検討, Optics & Photonics Japan 2014, Nov. 2014.
38.	鉄野翔太, Yasuhiro Mizutani and Tetsuo Iwata : 超解像ゴーストイメージングの開発, Optics & Photonics Japan 2014, Nov. 2014.
39.	瀧直也, Yasuhiro Mizutani and Tetsuo Iwata : サブ波長構造上に形成したナノ粒子構造体の偏光特性, Optics & Photonics Japan 2014, Nov. 2014.
40.	Takashi Ogura, Kenta Hayashi, Tetsuo Iwata and Takeshi Yasui : 可搬型THzコム参照型スペクトラム・アナライザーの開発, Optics & Photonics Japan2014, Nov. 2014.
41.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : 1.0 GHz光子計数型位相変調方式蛍光寿命計, 第75回応用物理学会秋季学術講演会, Sep. 2014.
42.	Hiroaki Uemura, Yasuhiro Mizurani, Takeshi Yasui and Tetsuo Iwata : 二重変調方式反射型THzエリプソメータの製作と金属表面上の塗装膜厚の測定, 第75回応用物理学会秋季学術講演会, 20a-C6-11, Sep. 2014.
43.	長田悠希, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージング法の開発, 2014年度精密工学会秋季大会学術講演会, Q40, Sep. 2014.
44.	渋谷九輝, Yasuhiro Mizutani, 中江雄大 and Tetsuo Iwata : 循環パターンゴーストイメージングによる一分子蛍光イメージング法の開発, 2014年度精密工学会秋季大会学術講演会, Q40, Sep. 2014.
45.	前原知侑, Yasuhiro Mizutani, 市橋宏基 and Tetsuo Iwata : ナノコンポジット分散状態観測のための表面プラズモン共鳴顕微鏡の開発, 2014年度精密工学会秋季大会学術講演会, P09, Sep. 2014.
46.	中江雄大, Yasuhiro Mizutani, 渋谷九輝 and Tetsuo Iwata : ゴーストイメージングエリプソメトリの開発, 2014年度精密工学会秋季大会学術講演会, C10, Sep. 2014.
47.	立嶋知彦, Yasuhiro Mizutani, 若山俊隆, 高和宏之, Tetsuo Iwata and 大谷幸利 : z 偏光を用いた 3 次元偏光計の開発(第1報), 2014年度精密工学会秋季大会学術講演会, F05, Sep. 2014.
48.	Takashi Ogura, Kenta Hayashi, Tetsuo Iwata and Takeshi Yasui : THzコム参照型スペクトラム・アナライザー用高速カレント・プリアンプ一体型光伝導アンテナモジュールの開発, 第75回応用物理学会秋季学術講演会, 19p-C6-16, Sep. 2014.
49.	Ippei Yonei, Yasuhiro Mizutani and Tetsuo Iwata : 位相差制御方式進行波型超音波モータの温度特性, 第14回日本機械学会機素潤滑設計部門講演会, 1109, Apr. 2014.
50.	銀屋真, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 反射型偏光顕微鏡による強誘電体表面の光学的異方性評価, 第61回応用物理学会春季学術講演会, Mar. 2014.
51.	Yoshiki Kaneoka, Yasuhiro Mizutani and Tetsuo Iwata : 表面プラズモン結合発光を用いた複数波長での偏光測定, 第61回応用物理学会春季講演会, Mar. 2014.
52.	Ippei Yonei, Yasuhiro Mizutani and Tetsuo Iwata : 位相差制御方式進行波型超音波モータの恒温動作について, 2014年度精密工学会春季大会学術講演会, C84, Mar. 2014.
53.	Yuki Nagata, Yasuhiro Mizutani and Tetsuo Iwata : 光熱変換効果による単一ナノ粒子イメージング法の開発(第 5 報)̶ナノ粒子近傍における局所熱伝導解析̶, 2014年度精密工学会春季大会学術講演会, B73, Mar. 2014.
54.	Tomoyuki Maehara, Kohki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : ナノコンボジット分散状態観測のための表面プラズモン共鳴顕微鏡の開発, 2014年度精密工学会春季大会学術講演会, B68, Mar. 2014.
55.	Kyuki Shibuya, Katsuhiro Nakae, Yasuhiro Mizutani and Tetsuo Iwata : 循環パターンゴーストイメージングによる一分子蛍光イメージング法の開発(第 1 報), 2014年度精密工学会春季大会学術講演会, B61, Mar. 2014.
56.	Tomohiko Tateshima, Makoto Ginya, Yasuhiro Mizutani and Tetsuo Iwata : 全方位ミュラー行列偏光顕微鏡の開発, 2014年度精密工学会春季大会学術講演会, B44, Mar. 2014.
57.	Hiroaki Uemura, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : 二重変調方式THzエリプソメータによる塗装膜厚測定, 第29回塗料・塗装研究発表会, Mar. 2014.
58.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : 蛍光寿命測定用レーザダイオード光源の高速パルス駆動, 第74回応用物理学会秋季学術講演会, 17a-P11-5, Nov. 2013.
59.	Ryoichi Sakashita, Yasuhiro Mizutani and Tetsuo Iwata : マイクロレンズアレイを用いた表面プラズモン共鳴による2次元薄膜測定法の開発, 精密工学会中四国支部広島地方講演会, Nov. 2013.
60.	Tomohiko Tateshima, Makoto Ginya, Yasuhiro Mizutani and Tetsuo Iwata : 全方位ミュラー行列偏光顕微鏡の開発(第一報)角度スペクトルの測定, 精密工学会中四国支部広島地方講演会, Nov. 2013.
61.	Tomoyuki Maehara, Kohki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : ナノコンポジット分散状態観測のための表面プラズモン共鳴顕微鏡の開発(第一報) 回折格子の最適化, 精密工学会中四国支部広島地方講演会, Nov. 2013.
62.	Yoshiki Kaneoka, Yasuhiro Mizutani and Tetsuo Iwata : 表面プラズモン結合発光を用いた偏光測定, Optics & Photonics Japan 2013, 12pP16, Nov. 2013.
63.	Kohki Ichihashi, Yasuhiro Mizutani and Tetsuo Iwata : グレーティング結合型表面プラズモン共鳴センサーの高感度化, Optics & Photonics Japan 2013, 13pP1, Nov. 2013.
64.	Hiroaki Uemura, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : 二重変調方式THzエリプソメータの製作, Optics & Photonics Japan 2013, 12pP17, Nov. 2013.
65.	Makoto Kimura, Yuki Nagata, Yasuhiro Mizutani and Tetsuo Iwata : マルチチャンネルフーリエ分光器を用いた幾何学的位相の測定, Optics & Photonics Japan 2013, 14pP15, Nov. 2013.
66.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : 光子計数型位相変調方式蛍光偏光解消測定装置の提案, Optics & Photonics Japan 2013, 12pP18, Nov. 2013.
67.	Kyuki Shibuya, Yasuhiro Mizutani and Tetsuo Iwata : 循環パターンによるゴーストイメージングの積算回数低減効果, 2013年度精密工学会秋季大会学術講演会, H06, Sep. 2013.
68.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージング法の開発(第4報)高倍率化による金ナノ粒子の挙動解析, 2013年度精密工学会秋季大会学術講演会, H08, Sep. 2013.
69.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : エリプソメトリ顕微鏡を用いた強誘電体表面の分域構造観察, 2013年度精密工学会秋季大会学術講演会, H38, Sep. 2013.
70.	Naoya Taki, Yasuhiro Mizutani, Tetsuo Iwata, 小嶋崇夫, 山本洋揮 and 古澤孝弘 : ナノコンポジット材料分散状態評価のためのナノ粒子検出システムの開発, 2013年度精密工学会秋季大会学術講演会, H43, Sep. 2013.
71.	Yoshiki Kaneoka, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 表面プラズモン結合発光の測定とその可能性について, 第51回光波センシング技術研究会, LST51-29, Jun. 2013.
72.	Makoto Ginya, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : PLZTの全偏光特性を考慮した複屈折性メモリデバイスの開発, 第51回光波センシング技術研究会, LST51-11, Jun. 2013.
73.	Yuki Nagata, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージングの開発(第3報) 粒子の運動の観察, 2013年度精密工学会春季大会学術講演会, A25, Mar. 2013.
74.	Takahiko Mizuno, Yasuhiro Mizutani and Tetsuo Iwata : 位相変調励起光源を用いた光子計数型位相変調方式蛍光寿命測定計, 第60回応用物理学会春季学術講演会, Mar. 2013.
75.	長田悠希, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージング法の開発(第2報)̶ フーリエ変換法を用いたリアルタイム検出̶, 2012年精密工学会秋季大会学術講演会, F82, Sep. 2012.
76.	銀屋真, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : た低電圧駆動型強誘電体メモリデバイスの開発(第1 報)̶偏光特性計測によるメモリ効果の観察̶, 2012年精密工学会秋季大会学術講演会, F74, Sep. 2012.
77.	中江雄大, Yasuhiro Mizutani and Tetsuo Iwata : スキャニングミラープロジェクタを用いた単軸ゴーストイメージング, 2012年精密工学会秋季大会学術講演会, F64, Sep. 2012.
78.	Shota Nakamura, Syuji Yoshioka, Takeshi Yasui, Tetsuo Iwata and Yasuhiro Mizutani : テラヘルツ・パルス・エコー法を用いた不透明薄膜の非接触リモート膜厚計測, 日本機械学会2012年度年次大会, Sep. 2012.
79.	水野孝彦, 宮田剛, Yasuhiro Mizutani and Tetsuo Iwata : 位相変調励起光源を用いたCe: YAGセラミックスの蛍光寿命測定, 第59回応用物理学関係連合講演会, 18a-B9-2, Mar. 2012.
80.	銀屋真, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 2重回転位相子型偏光計を用いたPLZTの全偏光特性計測, 第59回応用物理学関係連合講演会, 16p-B3-13, Mar. 2012.
81.	銀屋真, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : ミュラー行列計測によるPLZTの偏光特性の電圧依存性 ( 第4報) ̶ 分域内の偏光特性分布̶, 2012年精密工学会春季大会学術講演会, M20, Mar. 2012.
82.	滝直也, Yasuhiro Mizutani, Tetsuo Iwata, 小嶋崇夫, 山本洋揮 and 古澤孝弘 : 周期局在光および偏光解析法を用いたナノ粒子トラップシステムの開発 ( 第2報)-ナノ周期構造の形状パラメータの検討̶-, 2012年精密工学会春季大会学術講演会, M08, Mar. 2012.
83.	長田悠希, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : 光熱変換効果による単一ナノ粒子イメージング法の開発(第1報)-光熱変換効果による位相変化の測定-, 2012年精密工学会春季大会学術講演会, M06, Mar. 2012.
84.	西垣健太郎, Yasuhiro Mizutani and Tetsuo Iwata : 表面プラズモン共鳴のための変形Otto 配置測定光学系を用いた金属上の誘電体薄膜の膜厚測定, Optics & Photonics Japan 2011, P9, Nov. 2011.
85.	吉岡修司, Yasuhiro Mizutani, Takeshi Yasui and Tetsuo Iwata : テラヘルツ波を用いた塗装膜の厚さ推定への多変量解析手法の適用, Optics & Photonics Japan 2011, P10, Nov. 2011.
86.	品川幸太, Yasuhiro Mizutani and Tetsuo Iwata : Time Between Photons 法を用いた蛍光寿命測定, Optics & Photonics Japan 2011, P8, Nov. 2011.
87.	中尾星志, Yasuhiro Mizutani and Tetsuo Iwata : 光子計数型位相変調方式蛍光寿命計の構築, Optics & Photonics Japan 2011, 28aF3, Nov. 2011.
88.	水野孝彦, Yasuhiro Mizutani and Tetsuo Iwata : 位相変調励起光源を用いた位相変調方式蛍光寿命測定法, Optics & Photonics Japan 2011, 28aF4, Nov. 2011.
89.	Yuki Nagata, Yasuhiro Mizutani and Tetsuo Iwata : 光熱変換イメージングによるサブナノ粒子二次元検出法の開発, 2011年度精密工学会中国四国支部岡山地方学術講演会, A03, Oct. 2011.
90.	滝直也, Yasuhiro Mizutani, Tetsuo Iwata, 小嶋崇夫 and 古澤孝弘 : 周期局在光を用いたサブナノ粒子トラップシステム, 2011年精密工学会秋季大会学術講演会, M33, Sep. 2011.
91.	銀屋真, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : ミュラー行列計測によるPLZTの偏光特性の電圧依存性 (第3報), 2011年精密工学会秋季大会学術講演会, Sep. 2011.
92.	Yasuhiro Mizutani, Makoto Ginya, Tetsuo Iwata and 大谷幸利 : ミュラー行列計測によるPLZTの偏光特性解析 (第2報), 2011年精密工学会春季大会学術講演会, Feb. 2011.
93.	Takayuki Higuchi, Yasuhiro Mizutani and Tetsuo Iwata : ストロボ斜入射干渉計を用いた超音波モータの表面形状解析, 2010年度中国四国支部徳島地方学術講演会, 31-32, Nov. 2010.
94.	Makoto Ginya, Yasuhiro Mizutani and Tetsuo Iwata : 二重回転位相子型偏光計を用いたPLZTの偏光特性の電圧依存性, 2010年度中国四国支部徳島地方学術講演会, 29-30, Nov. 2010.
95.	Akihiro Tsutsumi, Yasuhiro Mizutani and Tetsuo Iwata : 同極対向配置による反磁性物質の非接触光駆動法, 2010年度中国四国支部徳島地方学術講演会, 27-28, Nov. 2010.
96.	Kentaro Nishigaki, Yasuhiro Mizutani and Tetsuo Iwata : 表面プラズモン共鳴に基づく光学系の電場強度計算, Optics & Photonics Japan 2010, 9pP10, Nov. 2010.
97.	Atsushi Endo, Yasuhiro Mizutani and Tetsuo Iwata : インドシアニングリーン溶液の近赤外蛍光寿命測定, Optics & Photonics Japan 2010, 8pP6, Nov. 2010.
98.	Syuji Yoshioka, Masato Kohri, Yasuhiro Mizutani and Tetsuo Iwata : 近赤外拡散反射スペクトル法によるコンクリート中の塩化物イオン濃度の推定, Optics & Photonics Japan 2010, 8pP5, Nov. 2010.
99.	Yasuhiro Mizutani, Nizam Suffan Mohamd and Tetsuo Iwata : 位相制御方式による超音波モータの駆動とその特性, 2010年精密工学会春季大会学術講演会, Mar. 2010.
100.	堤章洋, Yasuhiro Mizutani, Tetsuo Iwata and 大谷幸利 : パッシブ磁気浮上を用いた反磁性物質の非接触光駆動法, 2010年精密工学会春季大会学術講演会, Mar. 2010.
101.	Yusoff Yamin Mohd Muhammad, Yasuhiro Mizutani, Tetsuo Iwata, 大西康司, 相沢隆 and 小池崇文 : PLZT を用いた光学デバイスの開発(第一報), 2010年精密工学会春季大会学術講演会, Mar. 2010.
102.	山崎稔文, 清遠弘重, Yasuhiro Mizutani and Tetsuo Iwata : 蛍光位相変調法のヒト歯試料への適用と拡張指数関数によるデータ解析, Optics & Photonics Japan 2009, 464, Nov. 2009.
103.	大柳雅明, 柴田浩伸, Yasuhiro Mizutani and Tetsuo Iwata : 光電子増倍管応答遅延時間の波長依存性測定手法の提案Ⅱ, Optics & Photonics Japan 2009, 462, Nov. 2009.
104.	Yasuhiro Mizutani, 堤章洋, 大谷幸利 and Tetsuo Iwata : マイクロパッシブ磁気浮上による微小物体位置の光制御, 第14回知能メカトロニクスワークショップ, I2, Sep. 2009.
105.	Masaki Ohyanagi, Tetsuo Iwata and Hironobu Shibata : 光電子増倍管応答遅延時間の波長依存性測定手法の提案, Optics & Photonics Japan 2008, Nov. 2008.
106.	Tsuyoshi Miyata, Tetsuo Iwata and Tsutomu Araki : ゲート動作アバランシェフォトダイオードを用いたYAGセラミックス粉末蛍光寿命測定装置, Optics & Photonics Japan 2008, Nov. 2008.
107.	Hiroshige Kiyotou and Tetsuo Iwata : 高負荷抵抗接続光電子増倍管と自己回帰モデルに基づく蛍光寿命値の推定法, Optics & Photonics Japan 2008, Nov. 2008.
108.	Kentaro Nonaka and Tetsuo Iwata : 拡張指数関数を用いたヒト歯の蛍光減衰波形の解析, Optics & Photonics Japan 2008, Nov. 2008.
109.	Yusuke Wada and Tetsuo Iwata : Otto配置表面プラズモン共鳴測定系へのエリプソメトリーの適用 (II), Optics & Photonics Japan 2008, Nov. 2008.
110.	Hisashi Ochi and Tetsuo Iwata : 光電子増倍管複数ダイノード同時正弦波変調方式による高調波信号光の検出法, Optics & Photonics Japan 2008, Nov. 2008.
111.	Ritsuki Ito and Tetsuo Iwata : 高負荷抵抗接続PMTとARモデルを用いた位相法による蛍光寿命値の推定手法, Optics & Photonics Japan 2008, Nov. 2007.
112.	Yuusuke Wada and Tetsuo Iwata : Otto配置表面プラズモン共鳴へのエリプソメトリーの適用, Optics & Photonics Japan 2007, Nov. 2007.
113.	Ritsuki Ito and Tetsuo Iwata : 自己回帰モデルを用いた位相推定法 (パルス励起法による蛍光寿命の算出), Optics & Photonics Japan 2007, Nov. 2007.
114.	Go Komota and Tetsuo Iwata : Otto配置表面プラズモン共鳴を用いた金属表面状態二次元計測, Optics & Photonics Japan 2007, Nov. 2007.
115.	Shougo Maeda and Tetsuo Iwata : 導波路型SPRセンサへのエリプソメトリーの適用に関する基礎検討, Optics & Photonics Japan 2006, Nov. 2006.
116.	Hironobu Shibata and Tetsuo Iwata : 帯域制限された蛍光減衰波形測定系でのデコンボリューション法, Optics & Photonics Japan 2006, Nov. 2006.
117.	Akitaka Muneshige and Tetsuo Iwata : 位相変調型蛍光寿命測定への自己回帰モデルの適用, Optics & Photonics Japan 2006, Nov. 2006.
118.	前田彰吾 and Tetsuo Iwata : エリプソメトリの手法による表面共鳴プラズモンセンサの試作, 第67回応用物理学会講演会, Sep. 2006.
119.	Hironobu Shibata and Tetsuo Iwata : 帯域制限された蛍光減衰波形測定系でのデコンボリューション法の提案, 第67回応用物理学会講演会, Sep. 2006.
120.	福島修一郎, 安井武志, Tetsuo Iwata and 荒木勉 : レーザ励起ナノ秒蛍光寿命マッピングによる歯の形成と老化の研究, 生体医工学シンポジウム 2006, Sep. 2006.
121.	前田彰吾 and Tetsuo Iwata : エリプソメトリの手法による表面共鳴プラズモンセンサの検討, Optics Japan 2005, Nov. 2005.
122.	Hironobu Shibata and Tetsuo Iwata : FT型位相変調方式蛍光寿命計のための周波数帯域外挿法の提案, Optics Japan 2005, Nov. 2005.
123.	柴田浩伸 and Tetsuo Iwata : フーリエ変換型位相変調方式蛍光寿命計のための周波数帯域外挿法の提案, 第66回応用物理学会講演会, Sep. 2005.
124.	前田彰吾 and Tetsuo Iwata : 表面プラズモン共鳴へのエリプソメトリーの適用に関する検討, 第66回応用物理学会講演会, Sep. 2005.
125.	宮田剛, Tetsuo Iwata and 荒木勉 : ゲート動作アバランシェフォトダイオードを用いた高感度パルスオキシメータ, 生体医工学シンポジウム 2005, Sep. 2005.
126.	前田彰吾 and Tetsuo Iwata : 表面共鳴プラズモンセンサへのエリプソメトリの適用, 第52回応用物理学関係連合講演会, Mar. 2005.
127.	柴田浩伸 and Tetsuo Iwata : フーリエ変換型位相変調方式蛍光寿命計の試作, 第52回応用物理学関係連合講演会, Mar. 2005.
128.	安田敬史, 実吉永典, 安井武史, 荒木勉 and Tetsuo Iwata : テラヘルツ電磁波パルスを用いた塗装膜厚測定の高分解能化, 日本分光学会春季講演会, Nov. 2004.
129.	井上貴文 and Tetsuo Iwata : PMTダイノード変調方式を用いた蛍光寿命計, Optics Japan 2004, Nov. 2004.
130.	宮田剛, Tetsuo Iwata and 荒木勉 : ゲーテッドアバランシェフォトダイオードを用いたパルスオキシメータの試作, Optics Japan 2004, Nov. 2004.
131.	宮田剛, 安井武史, 荒木勉 and Tetsuo Iwata : 紫外LEDを用いた波長選択的高速光検出器, 第51回応用物理学関係連合講演会講演予稿集, Vol.3, Mar. 2004.
132.	Takuya Nakabayashi, Masanobu Haraguchi, Masuo Fukui, Takayuki Okamoto and Tetsuo Iwata : 表面共鳴プラズモン反射率共鳴ディップの角度·波長二次元同時測定光学系の試作, 第51回応用物理学関係連合講演会講演予稿集, Vol.3, No.29p-D-9, 1138, Mar. 2004.
133.	安田敬史, 安井武史, Tetsuo Iwata and 荒木勉 : テラヘルツイメージングを用いた塗装膜の膜厚ムラ計測, Optics Japan 2003, Nov. 2003.
134.	Takuya Nakabayashi, Tetsuo Iwata and Takayuki Okamoto : 表面共鳴プラズモン反射率共鳴ディップのθ-λ二次元表示, 第50回応用物理学関係連合講演会, Mar. 2003.
135.	高須剛, 荒木勉 and Tetsuo Iwata : 時間分解分光測光用ナノ秒ゲート光電子増倍管, Optics Japan 2002, Nov. 2002.
136.	今本洋平, Tetsuo Iwata, 荒木勉 and 内田照雄 : 正弦波電流変調キセノンランプ, Optics Japan 2002, Nov. 2002.
137.	高須剛, 荒木勉 and Tetsuo Iwata : 時間分解分光測光用ナノ秒ゲート光電子増倍管(II), 第63回応用物理学会講演会, Sep. 2002.
138.	高須剛, 荒木勉 and Tetsuo Iwata : 時間分解分光測光用ナノ秒ゲート光電子増倍管, 第49回応用物理学関係連合講演会講演, Mar. 2002.
139.	田中歳己, Tetsuo Iwata, 荒木勉 and 内田照雄 : イグニションコイルを用いたナノ秒Xeパルス光源, Optics Japan 2001, Nov. 2001.
140.	鎌田剛史 and Tetsuo Iwata : 周波数掃引型位相変調蛍光寿命計に関する検討, Optics Japan 2001, Nov. 2001.
141.	高須剛, 宮田剛, 荒木勉 and Tetsuo Iwata : 光電子増倍管内部ゲート方式ロックイン光検出モジュールの試作, 第48回応用物理学関係連合講演会講演, Mar. 2001.
142.	宮田剛, Tetsuo Iwata and 荒木勉 : ゲートバイアス型アバランシェ・フォトダイオードを用いた小型ロックイン光検出システムの試作, Optics Japan 2000, Nov. 2000.
143.	鎌田剛史 and Tetsuo Iwata : 紫外LEDとPLL位相検出を用いた蛍光寿命計, Optics Japan 2000, Nov. 2000.
144.	鎌田剛史 and Tetsuo Iwata : 紫外LEDを用いた位相変調型蛍光寿命計, 日本分光学会春季講演会, May 2000.
145.	田中歳己, 小松敏行, Tetsuo Iwata and 荒木勉 : 高圧半導体スイッチ外部制御ナノ秒白色パルス光源の試作, 第47回応用物理学関係連合講演会, Mar. 2000.

Patent:

1.	小勝負純 and Tetsuo Iwata : スペクトルデータ処理方法, 2000-338038 (2000), .
2.	Tetsuo Iwata and 小勝負純 : 高分解能分光装置, 2000-28434 (2000), .
3.	Tetsuo Iwata and 小勝負純 : 測定装置及びその装置における処理方法, 11-173986 (1999), .
4.	Takeshi Yasui, Tetsuo Iwata, Yasuhiro Mizurani, Takeo Minamikawa, Takahiko Mizuno, Eiji Hase and Hirotsugu Yamamoto : 計測装置及び照射装置, 2019-535718 (Aug. 2018), WO2019/031584 (Feb. 2019), 7079509 (May 2022).
5.	Takeshi Yasui, Tetsuo Iwata, Yasuhiro Mizurani, Takeo Minamikawa, Eiji Hase and Hirotsugu Yamamoto : 計測装置及び照射装置, PCT/JP2018/029924 (Aug. 2018), WO2019/031584 (Feb. 2019), US10837906 (Nov. 2021).
6.	Takeshi Yasui, Tetsuo Iwata, Yasuhiro Mizutani, Takeo Minamikawa, Yi-Da Hsieh, Eiji Hase and Hirotsugu Yamamoto : 計測装置, 2017-526246 (Jun. 2016), 2017/002535 (Jan. 2017), .
7.	Takeshi Yasui, Tetsuo Iwata, Yasuhiro Mizurani, Takeo Minamikawa, Yi-Da Hsieh, Eiji Hase and Hirotsugu Yamamoto : 計測装置, PCT/JP2016/66636 (Jun. 2016), WO2017/002535 (Jan. 2017), .
8.	Tetsuo Iwata, 大谷浩史 and 須崎寛則 : アダプティブアレー特性最適化方法, 2004-136502 (Apr. 2004), .
9.	Tetsuo Iwata, 後藤陽児, 須崎寛則 and 山階克久 : 信号到来方向推定装置，アダプティブアレー，受信神郷処理装置および測位装置, 2003-311683 (Sep. 2003), .
10.	Tetsuo Iwata, 大谷浩史 and 須崎寛則 : アダプティブアレーおよび測位装置, 2003-129496 (May 2003), .
11.	Tetsuo Iwata, 荒木勉 and 内田照雄 : キセノンランプ駆動装置，光源装置，分析装置，顕微鏡並びに診断装置及び方法, 2002-318025 (Oct. 2002), 4267897 (Feb. 2009).
12.	Tetsuo Iwata and 久田秀穂 : 収差補正分光器, 9-257918 (Sep. 1997), 11-83626 (Mar. 1999), .

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Ghost Imaging Ellipsometry (Project/Area Number: 15K13914 )
Development of a blood sugar level sensor by use of the geometric phase in the polarized light (Project/Area Number: 26560213 )
Development of a double-modulation terahertz ellipsometer and analysis of the synthesized polarized light (Project/Area Number: 26289066 )
Frequency-swept discrete Fourier transform spectroscopy ~demonstration and application in THz and near-infrared region~ (Project/Area Number: 26246031 )
Development of instrumental methods and systems for fluorescence lifetime measurements for a screening purpose of tumor diagnosis (Project/Area Number: 21300167 )
Development and application of real-time molecular microscope based on non-linear optical effect for biological specimen (Project/Area Number: 20240044 )
Construction of a high-sensitive and high-speed fluorescence lifetime measurement system and its application for tumor diagnosis (Project/Area Number: 18300152 )
Development of staining-free molecular imaging microscope for biological molecules and its application for quality control of cultured cells (Project/Area Number: 17200032 )
Construction of a Fourier-transform Phase-Modulation Fluorometer and a Fluorescence-Lifetime Mapping System and Its Application for Tumor Diagnosis Using a Microscope (Project/Area Number: 16300157 )
Development of molecular imaging microscope for biological specimen and its application for tissue examination (Project/Area Number: 15300161 )
Development of a Phase-Modulation Fluorometer and a Fluorescence-Lifetime Mapping System and ~ Its Application for Tumor Diagnosis Using a Microscope (Project/Area Number: 14380407 )
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Professor Emeritus : Iwata, Tetsuo

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Proceeding of Domestic Conference:

Patent:

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)