Updated on 2024/03/14

写真a

 
FUKANO Hideki
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Dr. Eng. ( 1994.12   Tokyo Institute of Technology )

 

Papers

  • High-Power Laser Irradiative Optical Fiber Probe Integrated with a Short Temperature Sensor for Laser Ablation Reviewed

    Kazuma Ooshima, Hideki Fukano

    TECHNICAL DIGEST OF THE TWENTY-EIGHTH MICROOPTICS CONFERENCE, MOC 2023   77 - 78   2023.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    A novel optical fiber probe with a very short integrated temperature sensor for high-power laser ablation is proposed and was successfully fabricated. Both optical mode and wavelength multiplication were simultaneously performed using a double-clad fiber for laser irradiation and temperature monitoring.

    DOI: 10.23919/MOC58607.2023.10302844

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  • Multi-point Optical Fiber Remote Temperature Measurement System by Combining Fabry-Perot-interference Sensors and a Wavelength Division Multiplexing Filter Reviewed

    Hideki Fukano, Mikihiro Kamada

    TECHNICAL DIGEST OF THE TWENTY-EIGHTH MICROOPTICS CONFERENCE, MOC 2023   67 - 68   2023.9

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    A multi-point temperature sensing system was developed using reflection-type sensors consisting of a Fabry-Perot interference structure with good temperature characteristics. It can be simply fabricated using a short temperature-sensing region sandwiched between single-mode fibers. It was operated in a dense wavelength division multiplexing configuration using an arrayed waveguide filter.

    DOI: 10.23919/MOC58607.2023.10302841

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  • 反射型光ファイバ温度センサを集積したレーザ加熱治療器の高出力化の検討

    大島和真, 相木崇宏, 深野秀樹

    電子情報通信学会技術研究報告(Web)   122 ( 380(OFT2022 52-66) )   71 - 74   2023.2

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  • High-sensitivity multipoint refractive index measurement system composed of multimode interference sensors and arrayed waveguide wavelength filters Reviewed

    Hideki Fukano, Takahito Mukai

    JAPANESE JOURNAL OF APPLIED PHYSICS   61 ( SK )   2022.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing Ltd  

    A multipoint sensing measurement system with high sensitivity was developed by combining multimode interference (MMI) sensors and a wavelength selection configuration. MMI optical fibers and an arrayed waveguide (AWG) wavelength filter work as refractive index sensors and wavelength selector, respectively. They were operated with a fine calibration technique using dual AWG wavelength filters and defined wavelength light from a tunable laser source. By employing narrow-core single-mode fibers for the input and output ports of the MMI, the optical fiber improved the average sensitivity up to 820 dB/RIU under multipoint sensing conditions.

    DOI: 10.35848/1347-4065/ac5d87

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  • Multipoint Sensing System with a Fine Refractive Index Resolution by Combining Multimode-interference-sensors and Wavelength Selection Reviewed

    Hideki Fukano and Takahito Mukai

    Proceedings of 26th Microoptics Conference (MOC2021)   186 - 187   2021.9

  • Development of New Multipoint Measurement System using Optical Fiber Refractive Index Sensor

    深野秀樹

    Annual Report of the Okayama Foundation for Science and Technology   ( 30 )   2021

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  • 光ファイバ屈折率センサを用いた透析液濃度モニタへの検討

    田上 周路, 宇都宮 大地, 近藤 洋平, 能勢 秀俊, 小林 正樹, 深野 秀樹

    日本レーザー医学会誌   39 ( 3 )   270 - 270   2018.9

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  • Optically Pumped Atomic Magnetometer for AC Magnetic Field―Calibration of Output Signals and Utilizing Permanent Magnets― Reviewed

    TAUE Shuji, SHINOHARA Masaru, TOYOTA Yoshitaka, FUJIMORI Kazuhiro, FUKANO Hideki

    J100-B ( 3 )   158 - 165   2017.3

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    We investigate the optical magnetometer for AC magnetic fields at several tens of kilohertz. The sensor requires a DC magnetic field to enhance its sensitivity. In this study, at first, we calibrated the signal response of the sensor using coils. The linear response for applied an AC field was obtained, and its sensitivity was 0.4 nT at 20 kHz. Subsequently, signal responses are investigated for comparison with using permanent magnets applying a DC field. The signal intensity was slightly decreased to about 81% by using magnets. These results suggest the possibility of miniaturization and metal-free configuration of the optical magnetometer.

    DOI: 10.14923/transcomj.2016pep0010

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  • Thermally annealed gold film on optical fiber for multimode interferometric refractive index measurement Reviewed

    Hosokawa, Yuki, Taue, Shuji, Fukano, Hideki

    2017 22ND MICROOPTICS CONFERENCE (MOC)   240 - 241   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    A simple method to form gold nanoparticles was applied to a fiber-optic interferometer to measure the refractive index. To form nanoparticles on the fiber, sputter-deposited gold thin film was thermally annealed. The sensitivity was improved when combining the gold nanoparticles with the optical fiber-based multimode interference sensor.

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  • アルカリ金属を用いた交流磁界の光学的検出における静磁界の空間不均一による感度への影響—Effect of spatial nonuniformity of DC magnetic field on AC magnetic field detection with atomic magnetometer—環境電磁工学

    田上 周路, 篠原 優, 豊田 啓孝, 藤森 和博, 深野 秀樹

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 320 )   7 - 12   2016.11

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    Language:Japanese   Publisher:電子情報通信学会  

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  • Coating-free reflection technique for fiber-optic sensors based on multimode interference: A temperature sensing study Reviewed

    Shuji Taue, Tsuyoshi Takahashi, Hideki Fukano

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 8 )   2016.8

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    A novel reflection technique for use in fiber-optic sensors is investigated and applied to a multimode interference structure. The reflectivity at a fiber end face is increased with two operations. Firstly, the light intensity is increased toward the periphery of the end-face by adjusting the fiber length, which is determined theoretically. Secondly, the fiber end-face is deformed into an ellipsoid by heating it with a gas torch. The deformed shape is characterized from microscopic images. The reflected light intensity is increased by more than 10 dB as a result of controlling the fiber length and deforming its end-face. Temperature sensing was performed using the reflection-type multimode interference structure immersed in temperature-controlled silicone oil. The resulting sensitivity was 0.028 degrees C for a 29.60 mm sensing region, achieved without using any reflection coating. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.08RE03

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  • 半球形先端をもつ反射型光ファイバセンサ : マルチモード干渉を利用した温度センシングへの適用—特集 光ファイバが面白い : さまざまな応用へのヒント(1)

    田上 周路, 高橋 毅, 深野 秀樹

    光アライアンス / 光アライアンス編集委員会 編   27 ( 5 )   10 - 14   2016.5

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    Language:Japanese   Publisher:日本工業出版  

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  • Highly Sensitive Reflection-type Optical Fiber Refractive Index Sensor with Rounded-Edge Structure Reviewed

    Fukano, Hideki, Kataoka, Rvo, Taue, Shuji

    2016 IEEE SENSORS   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    A reflection-type refractive index sensor with an edge-rounded end face of a multimode fiber is proposed and fabricated. The fabricated sensor with the designed structure shows a two-mode interference spectrum. The measured and calculated free spectral ranges in the spectra agree well with each other. The fabricated sensor coated with titanium shows sensitivity as high as 311 nm/RIU even with a sensor length less than 1 mm.

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  • Reflection-type optical fiber refractive-index sensor using a multimode interference structure with high sensitivity Reviewed

    Hideki Fukano, Takuya Hashimoto, Shuji Taue

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 4 )   2014.4

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    A high-sensitivity reflection-type refractive-index (RI) sensor using a multimode interference structure has been fabricated by forming a gold mirror at the end of a sensor fiber. The sensor part is composed of single-mode fibers (SMFs) attached to a multimode fiber (MMF) with an end-face mirror. This structure has the same function as an MMF sandwiched by SMFs, which is called a multimode interference (MMI) structure. The fabricated sensor shows a sensitivity as high as 6.8 x 10(-6) (at 1 pm wavelength resolution), which is estimated from the relationship between the change in RI and the shift in wavelength in a wide RI range, and 1.0 x 10(-5) (at 0.01 dB power resolution), which is estimated from the relationship between the change in RI and the variation of interference power at a fixed wavelength, despite the sensor having only half the length of a conventional two-port multimode interference RI sensor. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.53.04EG05

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  • High-sensitivity fiber-optic refractive index sensor based on multimode interference using small-core single-mode fiber for biosensing Reviewed

    Hideki Fukano, Tomohiro Aiga, Shuji Taue

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 4 )   2014.4

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    A fiber-optic refractive index (RI) sensor using multimode interference (MMI) composed of an unclad multimode fiber (MMF) sandwiched by small-core single-mode fibers (SMFs) has been proposed and demonstrated. The small-core SMF at the input port enhances the diffraction of the light outputted to the MMF, and that at the output port provides a steep coupling characteristic of interfered light at the end of the MMF, resulting in the generation of a sharp signal. This leads to high sensitivity to small RI changes. A very high sensitivity of less than 6 x 10(-6) at an RI of more than 1.35 has been realized. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.53.04EL08

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  • Fiber-optic Biosensor based on Multimode Interference

    Doi Mayuko, Taue Shuji, Yanase Yuhki, Fukano Hideki

    JSAP Annual Meetings Extended Abstracts   2014.1   2596 - 2596   2014.3

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    Language:Japanese   Publisher:The Japan Society of Applied Physics  

    DOI: 10.11470/jsapmeeting.2014.1.0_2596

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  • Phononic-Crystal Acoustic Lens by Design for Energy-Transmission Devices Reviewed

    Yusuke Kanno, Kenji Tsuruta, Kazuhiro Fujimori, Hideki Fukano, Shigeji Nogi

    ELECTRONICS AND COMMUNICATIONS IN JAPAN   97 ( 1 )   22 - 27   2014.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal/ceramic cylinders placed periodically in water. The lens effect is observed for the far-field wave in phononic crystals with two-layered and graded-index structure. We compare the focal intensity and the energy transmission efficiency in these numerical experiments, and show that a novel energy-transmission device can be designed using phononic crystals. (c) 2013 Wiley Periodicals, Inc. Electron Comm Jpn, 97(1): 22-27, 2014; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.11491

    DOI: 10.1002/ecj.11491

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  • Optically Powered Voltage Supply Device for Effective Utilization of Optical Energy in the Fiber-to-the-Home Network Reviewed

    Hideki Fukano, Takeshi Shinagawa, Kenji Tsuruta

    ELECTRONICS AND COMMUNICATIONS IN JAPAN   96 ( 10 )   37 - 42   2013.10

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    SUMMARYAn optically powered device using an InGaAs photodiode has been developed. This study aims to harvest light energy (2.8 to 500 mu W) from the FTTH (fiber-to-the-Home) network and to utilize it for operating remote sensors without an external energy source. We designed the booster circuit and evaluated its characteristics, confirming that it could boost an input voltage of 0.3 V to 3.0 V. We also evaluated the characteristics of an InGaAs photodiode and confirmed that it could output a voltage over 0.3 V using 10-mu W input light. We demonstrate that a ready-made sensor can be operated with an input optical power as low as 10 mu W. (c) 2013 Wiley Periodicals, Inc. Electron Comm Jpn, 96(10): 37-42, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.11472

    DOI: 10.1002/ecj.11472

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  • マルチモード干渉を用いた光ファイババイオセンサの検討

    土井 麻祐子, 田上 周路, 柳瀬 雄輝, 深野 秀樹

    応用物理学会学術講演会講演予稿集   2013.2   3135 - 3135   2013.8

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    Language:Japanese   Publisher:公益社団法人 応用物理学会  

    DOI: 10.11470/jsapmeeting.2013.2.0_3135

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  • 光ファイバを利用した極細エンドスコープにおける色収差の補正

    立石 成, 田上 周路, 深野 秀樹

    応用物理学会学術講演会講演予稿集   2013.2   1681 - 1681   2013.8

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    DOI: 10.11470/jsapmeeting.2013.2.0_1681

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  • マルチモード干渉と局在表面プラズモン共鳴を利用した光ファイバ屈折率センサの検討

    大藤 浩之, 深野 秀樹, 田上 周路

    応用物理学会学術講演会講演予稿集   2012.2   1153 - 1153   2012.8

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    DOI: 10.11470/jsapmeeting.2012.2.0_1153

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  • Experimental Analysis of Optical Fiber Multimode Interference Structure and its Application to Refractive Index Measurement Reviewed

    Shuji Taue, Yoshiki Matsumoto, Hideki Fukano, Kenji Tsuruta

    JAPANESE JOURNAL OF APPLIED PHYSICS   51 ( 4 )   2012.4

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    We investigated a fiber-based multimode interference phenomenon in the wavelength domain by using a white light source and an optical spectrum analyzer. This phenomenon was produced by a larger-core optical fiber joined at both ends with smaller-core optical fibers. We examined the variation of interference wavelength with changes in the length of the larger-core fiber. The interference wavelengths were blue-shifted and the interference signals were sharpened with an increase in the length of the larger-core fiber. The calculated results agreed well with the measured results. Next, we investigated how the input and output fibers with a small core influence the interference signal characteristics. By comparing the amplitude differences of the interference signal we find the conditions of input and output (I/O) fibers for higher sensitivity. In addition, an interference-signal shift was observed by changing the medium surrounding an multimode interference (MMI) structure. The amount of shift increased at a longer wavelength. This leads to the sensitive detection of the refractive index. Finally, a demonstration of the optical fiber refractometer with a multimode interference structure was given by refractive-index measurements of ethanol/water solutions. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.51.04DG14

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  • Negative Refraction and Energy-Transmission Efficiency of Acoustic Waves in Two-Dimensional Phononic Crystal: Numerical and Experimental Study Reviewed

    Yuuki Kasai, Kenji Tsuruta, Kazuhiro Fujimori, Hideki Fukano, Shigeji Nogi

    JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 6 )   2011.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    The negative refraction of acoustic waves in a two-dimensional phononic-crystal slab is studied by numerical simulation based on the finite-difference time-domain (FDTD) method and by ultrasonic measurement. The incident-angle dependences of energy-transmission efficiency in the simulation and experiment are in good agreement in the frequency range of approximately 1.2 MHz. Using the FDTD method, we optimize the efficiency by varying structural parameters such as filling fraction and slab thickness. The effect of deviation from the ideal crystallinity is also evaluated quantitatively via the simulation. These results indicate that an energetically efficient acoustic lens can be fabricated by carefully optimizing the structure of the phononic crystal. (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.50.067301

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  • Acoustic lens using sonic crystal for energy-transmission application Reviewed

    Y. Kanno, Y. Kasai, K. Tsuruta, K. Fujimori, H. Fukano, S. Nogi

    2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2011 - Proceedings   207 - 210   2011

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    We design and characterize a two-dimensional sonic crystal (SC) to manipulate the propagation of acoustic waves by numerical simulation based on the finite-difference time-domain (FDTD) method and by ultrasonic measurement. Two types of SC for an acoustic lens effect are studied. One is a homogeneous periodic structure exhibiting negative refraction, and the other has a hetero-structure. Negative refraction behavior in the simulation is good agreement with the experiment in the frequency range around 1.2MHz. We also observe a lens effect for far-field wave in the hetero-structured SC. These results indicate that a novel energy-transmission/harvesting device can be designed using SCs. © 2011 IEEE.

    DOI: 10.1109/IMWS.2011.5877131

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MISC

  • 光ファイバを用いた温度同時測定可能な加熱用円錐空洞プローブの検討

    弘松亮真, 深野秀樹

    2023年度(第74回)電気・情報関連学会中国支部連合大会   R23-15-01   2023.10

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  • 新規光ファイバ焼灼医療機器の開発~針生検後Tract焼灼への応用~

    馬越紀行, 生口俊浩, 深野秀樹, 櫻井淳, 松井裕輔, 冨田晃司, 宇賀麻由, 川端隆寛, 宗友一晃, 永田翔馬, 平木隆夫

    第1回日本アブレーション研究会   S2-8   2023.2

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  • Measurement of Curvature using Optical Fiber with Multimode Interference Structure

    CUI Haoyang, 深野秀樹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   73rd   2022

  • Evaluation of Reflective Temperature Sensor Using Double-Clad Fiber

    大島和真, 深野秀樹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   73rd   2022

  • Fabrication and Evaluation of Fiber Optic Temperature Sensors for Hyperthermia

    松岡詩織, 深野秀樹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   72nd   2021

  • Proposal of an all-glass fiber-optic temperature sensor for hyperthermia

    三角純平, 深野秀樹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020

  • Simultaneous measurement of temperature and concentration in liquid sampleusing refractive-index-sensing optical comb (2) ~Derivation of temperature and concentration for spectral measurement ~

    Oe Ryo, Minamikawa Takeo, Taue Shuji, Fukano Hideki, Nakajima Yoshiaki, minoshima Kaoru, Yasui Takeshi

    JSAP Annual Meetings Extended Abstracts   2019.1   835 - 835   2019.2

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    Language:Japanese   Publisher:The Japan Society of Applied Physics  

    DOI: 10.11470/jsapmeeting.2019.1.0_835

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  • Refractive-index sensing using fiber optical frequency comb mode-locked by saturableabsorbed mirror

    Oe Ryo, Minamikawa Takeo, Taue Shuji, Fukano Hideki, Nakajima Yoshiaki, Minoshima Kaoru, Yasui Takeshi

    JSAP Annual Meetings Extended Abstracts   2019.1   836 - 836   2019.2

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    Language:Japanese   Publisher:The Japan Society of Applied Physics  

    DOI: 10.11470/jsapmeeting.2019.1.0_836

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  • Simultaneous measurement of temperature and concentration in liquid sample using refractive-index-sensing optical comb

    Oe Ryo, Minamikawa Takeo, Taue Shuji, Fukano Hideki, Nakajima Yoshiaki, Minoshima Kaoru, Yasui Takeshi

    JSAP Annual Meetings Extended Abstracts   2018.2   821 - 821   2018.9

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    DOI: 10.11470/jsapmeeting.2018.2.0_821

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  • Refractive index measurement based on disturbance-to-RF conversion in fiber optical comb cavity ~Observation of refractive-index-dependent shift of repetition frequency~

    Oe Ryo, Nagai Kosuke, Minamikawa Takeo, Taue Shuji, Fukano Hideki, Nakajima Yoshiaki, Minoshima Kaoru, Yasui Takeshi

    JSAP Annual Meetings Extended Abstracts   2018.1   1000 - 1000   2018.3

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    DOI: 10.11470/jsapmeeting.2018.1.0_1000

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  • Refractive index measurement based on disturbance-to-RF conversion in fiber optical comb cavity

    Oe Ryo, Nagai Kosuke, Minamikawa Takeo, taue Syuji, Fukano Hideki, Nakajima Yoshiaki, Minoshima Kaoru, Yasui Takeshi

    JSAP Annual Meetings Extended Abstracts   2017.2   719 - 719   2017.8

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    DOI: 10.11470/jsapmeeting.2017.2.0_719

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  • AC Magnetic Field Imaging by using Digital Micro-mirror Device Reviewed

    Taue, Shuji, Toyota, Yoshitaka, Fujimori, Kazuhiro, Fukano, Hideki

    2017 22ND MICROOPTICS CONFERENCE (MOC)   2017-November   212 - 213   2017

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    Language:English   Publisher:IEEE  

    We demonstrated optical imagings of AC magnetic fields. A digital micro-mirror device and a lock-in detection allowed obtaining sub-millimeter resolution images without using magnetic shields. Images of gradient field from a wire suggested its potential to apply for signal-source estimations.

    DOI: 10.23919/MOC.2017.8244562

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  • B-13-12 Theoretical Analysis of Optical-Fiber Sensor using Multi-Mode Interference for Sensitivity Improvement

    Taue Shuji, Fukano Hideki

    Proceedings of the Society Conference of IEICE   2014 ( 2 )   299   2014.9

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • B-4-5 Investigation of low-frequency electromagnetic wave measurement using alkali metal atoms

    Nagaoka Takayuki, Taue Shuji, Fukano Hideki

    Proceedings of the Society Conference of IEICE   2014 ( 1 )   232   2014.9

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • Effect on acoustic wave propagation by the interior structure of waveguide filled up with water

    Tsubouchi Kazuya, Tadokoro Masaaki, Fujimori Kazuhiro, Ishikawa Atsushi, Tsuruta Kenji, Fukano Hideki

    The Proceedings of The Computational Mechanics Conference   2014.27   325 - 326   2014

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecmd.2014.27.325

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  • Investigation of SPR optical fiber refractive index sensor using a copper thin film

    Okada Takanori, Taue Shuji, Fukano Hideki

    Proceedings of the Society Conference of IEICE   2013 ( 1 )   154   2013.9

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • Design and characteristics of optically powered electronic circuit operatable under low power condition

    Nishikawa Ryo, Taue Shuji, Fukano Hideki

    Proceedings of the Society Conference of IEICE   2013 ( 2 )   389   2013.9

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • B-13-19 Characteristics of optically powered device with InGaAs-photodiode

    Shinagawa Takeshi, Fukano Hideki, Taue Shuji

    Proceedings of the IEICE General Conference   2012 ( 2 )   523   2012.3

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • B-13-36 High-Sensitive Optical-Fiber Refractometer with Multimode Interference Structure

    Matsumoto Yoshiki, Fukano Hideki, Taue Shuji

    Proceedings of the IEICE General Conference   2012 ( 2 )   540   2012.3

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • Phononic-crystal acoustic lens by design for energy-transmission devices

    Yusuke Kanno, Kenji Tsuruta, Kazuhiro Fujimori, Hideki Fukano, Shigeji Nogi

    IEEJ Transactions on Electronics, Information and Systems   132 ( 5 )   686 - 690   2012

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    Language:English   Publisher:Institute of Electrical Engineers of Japan  

    Lens effect of acoustic wave in two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal/ceramic cylinders placed periodically in water. Lens effect is observed for far-field wave in the phononic crystals with two-layered and graded-index structure. We compare the focal intensity and the energy transmission efficiency in these numerical experiments, and show that a novel energy-transmission device can be designed using phononic crystals. © 2012 The Institute of Electrical Engineers of Japan.

    DOI: 10.1541/ieejeiss.132.686

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  • Optically-powered voltage-supply-device for effective utilization of optical energy in the fiber-to-the-home network

    Hideki Fukano, Takeshi Shinagawa, Kenji Tsuruta

    IEEJ Transactions on Electronics, Information and Systems   132 ( 4 )   495 - 499   2012

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    An optically powered device with using InGaAs-Photodiode has been developed. This study aims to harvest light energy (2.8∼500 μW) from the FTTH (Fiber To The Home) network and to utilize it for operating remote sensors without external energy sources. First, we designed and evaluated the characteristics of the booster circuit and confirmed that it could boost an input voltage of 0.3 V to 3.0 V. Next, we also evaluated the characteristics of InGaAs photodiode and confirmed that it can output a voltage over 0.3 V at 10-μW input light. We demonstrate that a ready-made sensor can be operated with an input optical power as low as 10 μW. © 2012 The Institute of Electrical Engineers of Japan.

    DOI: 10.1541/ieejeiss.132.495

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Presentations

  • High-Power Laser Irradiative Optical Fiber Probe Integrated with a Short Temperature Sensor for Laser Ablation

    Kazuma Ooshima, Hideki Fukano

    28th Microoptics Conference (MOC2023)  2023.9.25 

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    Event date: 2023.9.24 - 2023.9.27

    Language:English  

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  • Multi-point Optical Fiber Remote Temperature Measurement System by Combining Fabry–Perot-interference Sensors and a Wavelength Division Multiplexing Filter

    Hideki Fukano, Mikihiro Kamada

    28th Microoptics Conference (MOC2023)  2023.9.25 

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    Event date: 2023.9.24 - 2023.9.27

    Language:English  

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  • 新しい温度センサを集積した光ファイバプローブを用いたレーザ照射加熱治療器

    深野秀樹, 生口俊浩, 馬越紀行, 櫻井淳

    日本ハイパーサーミア学会第 40 回大会  2023.9.8 

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    Event date: 2023.9.8 - 2023.9.9

    Presentation type:Oral presentation (general)  

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  • 光ファイバを用いた温度同時測定可能な加熱用円錐空洞プローブの検討

    弘松亮真, 深野秀樹

    2023年度(第74回)電気・情報関連学会中国支部連合大会  2023.10.28 

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  • 反射型光ファイバ温度センサを集積したレーザ加熱治療器の高出力化の検討

    大島 和真, 相木 崇宏, 深野 秀樹

    光ファイバ応用技術研究会(OFT)  2023.2.17 

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Industrial property rights

  • 温度変化検出装置及び加熱治療装置

    深野 秀樹

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    Applicant:国立大学法人 岡山大学

    Application no:特願2022-087853  Date applied:2022.5.30

    Announcement no:特開2023-175422  Date announced:2023.12.12

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  • 物理量の測定装置及び温度測定装置

    深野 秀樹

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    Applicant:国立大学法人 岡山大学

    Application no:特願2020-161279  Date applied:2020.9.25

    Announcement no:特開2022-054215  Date announced:2022.4.6

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  • ガソリン中の硫黄成分の濃度を推定する方法

    本田 暁拡, 深野 秀樹

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    Applicant:トヨタ自動車株式会社

    Application no:特願2019-210427  Date applied:2019.11.21

    Announcement no:特開2021-081356  Date announced:2021.5.27

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  • ガソリン中の硫黄成分の濃度を推定する方法

    本田 暁拡, 深野 秀樹

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    Applicant:トヨタ自動車株式会社

    Application no:特願2019-210427  Date applied:2019.11.21

    Announcement no:特開2021-081356  Date announced:2021.5.27

    Patent/Registration no:特許第7144388号  Date registered:2022.9.20 

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  • 温度変化検出装置及び温熱治療装置

    深野 秀樹

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    Applicant:国立大学法人 岡山大学

    Application no:特願2019-190978  Date applied:2019.10.18

    Announcement no:特開2021-065292  Date announced:2021.4.30

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  • 温熱治療器

    深野 秀樹

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    Applicant:国立大学法人 岡山大学

    Application no:特願2018-190480  Date applied:2018.10.5

    Announcement no:特開2020-058481  Date announced:2020.4.16

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  • 測定システム

    森 信彦, 菅 延達, 伊藤 彰浩, 野澤 逸平, 深野 秀樹

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    Applicant:株式会社エィ・ダブリュ・サービス

    Application no:特願2018-180093  Date applied:2018.9.26

    Announcement no:特開2020-051841  Date announced:2020.4.2

    Patent/Registration no:特許第6804499号  Date registered:2020.12.4 

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  • 光学装置

    森 信彦, 菅 延達, 伊藤 彰浩, 野澤 逸平, 深野 秀樹

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    Applicant:株式会社エィ・ダブリュ・サービス

    Application no:特願2018-180093  Date applied:2018.9.26

    Announcement no:特開2020-051841  Date announced:2020.4.2

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  • 光ファイバ式計測装置及び光ファイバ式計測方法

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:JP2018013667  Date applied:2018.3.30

    Patent/Registration no:特許第7006964号  Date registered:2022.1.11 

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  • 温熱治療器

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:JP2018013869  Date applied:2018.3.30

    Publication no:WO2019-026347  Date published:201927

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  • 光ファイバ式計測装置及び光ファイバ式計測方法

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:JP2018013667  Date applied:2018.3.30

    Publication no:WO2019-073623  Date published:2019418

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  • 温熱治療器

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2019-533892  Date applied:2018.3.30

    Patent/Registration no:特許第6915905号  Date registered:2021.7.19 

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  • 屈折率計測装置及び方法

    安井 武史, 南川 丈夫, 麻植 凌, 田上 周路, 深野 秀樹, 美濃島 薫

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    Applicant:国立大学法人徳島大学

    Application no:特願2017-160442  Date applied:2017.8.23

    Announcement no:特開2019-039723  Date announced:2019.3.14

    Patent/Registration no:特許第6985695号  Date registered:2021.11.30 

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  • 屈折率計測装置及び方法

    安井 武史, 南川 丈夫, 麻植 凌, 田上 周路, 深野 秀樹, 美濃島 薫

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    Applicant:国立大学法人徳島大学

    Application no:特願2017-160442  Date applied:2017.8.23

    Announcement no:特開2019-039723  Date announced:2019.3.14

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  • 加熱治療器

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2016-212380  Date applied:2016.10.29

    Announcement no:特開2018-068673  Date announced:2018.5.10

    Patent/Registration no:特許第6752414号  Date registered:2020.8.21 

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  • 光ファイバ装置及びセンサシステム

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2016-212379  Date applied:2016.10.29

    Announcement no:特開2017-102107  Date announced:2017.6.8

    Patent/Registration no:特許第6681070号  Date registered:2020.3.25 

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  • 加熱治療器

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2016-212380  Date applied:2016.10.29

    Announcement no:特開2018-068673  Date announced:2018.5.10

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  • 光ファイバ装置及びセンサシステム

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2016-212379  Date applied:2016.10.29

    Announcement no:特開2017-102107  Date announced:2017.6.8

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  • 光ファイバ装置

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2015-139875  Date applied:2015.7.13

    Announcement no:特開2017-020946  Date announced:2017.1.26

    Patent/Registration no:特許第6866987号  Date registered:2021.4.12 

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  • 光ファイバ装置

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2015-139875  Date applied:2015.7.13

    Announcement no:特開2017-020946  Date announced:2017.1.26

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  • 屈折率の検出方法及び光ファイバセンサシステム

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2014-208299  Date applied:2014.10.9

    Announcement no:特開2016-080366  Date announced:2016.5.16

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  • 屈折率の検出方法及び光ファイバセンサシステム

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2014-208299  Date applied:2014.10.9

    Announcement no:特開2016-080366  Date announced:2016.5.16

    Patent/Registration no:特許第6535856号  Date registered:2019.6.14 

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  • 光ファイバ式計測方法及び光ファイバ式計測装置

    深野 秀樹, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2014-085015  Date applied:2014.4.16

    Announcement no:特開2015-203692  Date announced:2015.11.16

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  • 屈折率の検出方法及び光ファイバセンサシステム

    深野 秀樹, 鶴田 健二, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2011-126942  Date applied:2011.6.7

    Announcement no:特開2012-251963  Date announced:2012.12.20

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  • 屈折率の検出方法及び光ファイバセンサシステム

    深野 秀樹, 鶴田 健二, 田上 周路

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    Applicant:国立大学法人 岡山大学

    Application no:特願2011-126942  Date applied:2011.6.7

    Announcement no:特開2012-251963  Date announced:2012.12.20

    Patent/Registration no:特許第5791073号  Date registered:2015.8.14 

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  • 化合物半導体の製造方法、半導体受光素子の製造方法、化合物半導体及び半導体受光素子

    満原 学, 深野 秀樹, 佐藤 具就, 近藤 康洋

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    Applicant:日本電信電話株式会社

    Application no:特願2008-211295  Date applied:2008.8.20

    Announcement no:特開2010-050176  Date announced:2010.3.4

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  • 半導体光増幅器

    満原 学, 佐藤 具就, 柴田 泰夫, 深野 秀樹, 藤澤 剛, 硴塚 孝明, 近藤 康洋

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    Applicant:日本電信電話株式会社

    Application no:特願2008-039582  Date applied:2008.2.21

    Announcement no:特開2009-200195  Date announced:2009.9.3

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  • 半導体光増幅器

    満原 学, 佐藤 具就, 柴田 泰夫, 深野 秀樹, 藤澤 剛, 硴塚 孝明, 近藤 康洋

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    Applicant:日本電信電話株式会社

    Application no:特願2008-039582  Date applied:2008.2.21

    Announcement no:特開2009-200195  Date announced:2009.9.3

    Patent/Registration no:特許第4944813号  Date registered:2012.3.9 

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  • 光検出器

    深野 秀樹, 満原 学, 佐藤 具就

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    Applicant:日本電信電話株式会社

    Application no:特願2007-297842  Date applied:2007.11.16

    Announcement no:特開2009-124010  Date announced:2009.6.4

    Patent/Registration no:特許第5270136号  Date registered:2013.5.17 

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  • 光検出器

    深野 秀樹, 満原 学, 佐藤 具就

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    Applicant:日本電信電話株式会社

    Application no:特願2007-297842  Date applied:2007.11.16

    Announcement no:特開2009-124010  Date announced:2009.6.4

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  • 光検出器

    深野 秀樹, 満原 学, 佐藤 具就

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    Applicant:日本電信電話株式会社

    Application no:特願2007-198591  Date applied:2007.7.31

    Announcement no:特開2009-038071  Date announced:2009.2.19

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  • 半導体受光素子

    満原 学, 佐藤 具就, 深野 秀樹, 近藤 康洋, 荒井 昌和

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    Applicant:日本電信電話株式会社

    Application no:特願2007-130076  Date applied:2007.5.16

    Announcement no:特開2008-288293  Date announced:2008.11.27

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  • 光検出器

    深野 秀樹, 満原 学, 佐藤 具就

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    Applicant:日本電信電話株式会社

    Application no:特願2007-066081  Date applied:2007.3.15

    Announcement no:特開2008-227328  Date announced:2008.9.25

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  • 光集積デバイス

    深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2005-354336  Date applied:2005.12.8

    Announcement no:特開2007-158204  Date announced:2007.6.21

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  • 導電性半導体基板上の電極パッド

    赤毛 勇一, 深野 秀樹, 山中 孝之, 齋藤 正

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    Applicant:日本電信電話株式会社

    Application no:特願2006-515332  Date applied:2005.5.18

    Patent/Registration no:特許第4422146号  Date registered:2009.12.11 

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  • 導電性半導体基板上の電極パッド

    赤毛 勇一, 深野 秀樹, 山中 孝之, 齋藤 正

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    Applicant:日本電信電話株式会社

    Application no:JP2005009064  Date applied:2005.5.18

    Publication no:WO2005-112096  Date published:20051124

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  • 光集積デバイス

    深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2005-108282  Date applied:2005.4.5

    Announcement no:特開2006-287144  Date announced:2006.10.19

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  • 光変調器および光変調方法

    中島 裕樹, 山中 孝之, 深野 秀樹, 赤毛 勇一, 田村 宗久, 齋藤 正

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    Applicant:日本電信電話株式会社

    Application no:特願2006-516884  Date applied:2005.3.18

    Patent/Registration no:特許第4184405号  Date registered:2008.9.12 

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  • 光変調器および光変調方法

    中島 裕樹, 山中 孝之, 深野 秀樹, 赤毛 勇一, 田村 宗久, 齋藤 正

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    Applicant:日本電信電話株式会社

    Application no:JP2005004958  Date applied:2005.3.18

    Publication no:WO2005-091056  Date published:2005929

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  • 光集積デバイス

    深野 秀樹, 山中 孝之, 赤毛 勇一

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    Applicant:日本電信電話株式会社

    Application no:特願2005-015114  Date applied:2005.1.24

    Announcement no:特開2006-203099  Date announced:2006.8.3

    Patent/Registration no:特許第4578989号  Date registered:2010.9.3 

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  • 光集積デバイス

    深野 秀樹, 山中 孝之, 赤毛 勇一

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    Applicant:日本電信電話株式会社

    Application no:特願2005-015114  Date applied:2005.1.24

    Announcement no:特開2006-203099  Date announced:2006.8.3

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  • マイクロストリップ線路及び特性インピーダンス制御方法

    赤毛 勇一, 深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2004-206832  Date applied:2004.7.14

    Announcement no:特開2006-033217  Date announced:2006.2.2

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  • 光集積デバイス

    深野秀樹, 田村宗久

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    Applicant:日本電信電話株式会社

    Application no:特願2004-027658  Date applied:2004.2.4

    Announcement no:特開2005-223043  Date announced:2005.8.18

    Patent/Registration no:特許第4629346号  Date registered:2010.11.19 

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  • 光集積デバイス

    深野秀樹, 田村宗久

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    Applicant:日本電信電話株式会社

    Application no:特願2004-027658  Date applied:2004.2.4

    Announcement no:特開2005-223043  Date announced:2005.8.18

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  • 半導体光変調器及び光変調器付きレーザ

    松岡 隆志, 深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2003-321580  Date applied:2003.9.12

    Announcement no:特開2004-133437  Date announced:2004.4.30

    Patent/Registration no:特許第4072107号  Date registered:2008.1.25 

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  • 半導体光変調器及び光変調器付きレーザ

    松岡 隆志, 深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2003-321580  Date applied:2003.9.12

    Announcement no:特開2004-133437  Date announced:2004.4.30

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  • 半導体電界吸収型変調器

    赤毛 勇一, 深野 秀樹

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    Applicant:日本電信電話株式会社

    Application no:特願2003-278514  Date applied:2003.7.23

    Announcement no:特開2005-043722  Date announced:2005.2.17

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  • 半導体電界吸収型変調器およびその製造方法

    赤毛 勇一, 深野 秀樹, 斉藤 正

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    Applicant:日本電信電話株式会社

    Application no:特願2003-113279  Date applied:2003.4.17

    Announcement no:特開2004-319851  Date announced:2004.11.11

    Patent/Registration no:特許第4357866号  Date registered:2009.8.14 

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  • 半導体電界吸収型変調器およびその製造方法

    赤毛 勇一, 深野 秀樹, 斉藤 正

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    Application no:特願2003-113279  Date applied:2003.4.17

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    Application no:特願平11-019460  Date applied:1999.1.28

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    Application no:特願平11-019460  Date applied:1999.1.28

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    Application no:特願平10-192793  Date applied:1998.7.8

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    Application no:特願平10-107377  Date applied:1998.4.17

    Announcement no:特開平11-307804  Date announced:1999.11.5

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    Application no:特願平10-107377  Date applied:1998.4.17

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    Application no:特願平10-008236  Date applied:1998.1.20

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    Announcement no:特開平11-135823  Date announced:1999.5.21

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    Application no:特願平9-164229  Date applied:1997.6.20

    Announcement no:特開平11-017208  Date announced:1999.1.22

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    Announcement no:特開平10-321960  Date announced:1998.12.4

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  • フォトトランジスタ

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    Announcement no:特開平10-321893  Date announced:1998.12.4

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    Application no:特願平9-052760  Date applied:1997.3.7

    Announcement no:特開平10-190042  Date announced:1998.7.21

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    Application no:特願平9-052760  Date applied:1997.3.7

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    Announcement no:特開平10-125948  Date announced:1998.5.15

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    Announcement no:特開平10-116979  Date announced:1998.5.6

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    Application no:特願平7-130525  Date applied:1995.5.29

    Announcement no:特開平8-330622  Date announced:1996.12.13

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    Application no:特願平5-209920  Date applied:1993.8.2

    Announcement no:特開平7-045632  Date announced:1995.2.14

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    Application no:特願平4-131376  Date applied:1992.4.27

    Announcement no:特開平5-304165  Date announced:1993.11.16

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    Application no:特願平4-096022  Date applied:1992.3.24

    Announcement no:特開平5-275730  Date announced:1993.10.22

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    Application no:特願平4-096022  Date applied:1992.3.24

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    Application no:特願平2-232826  Date applied:1990.9.3

    Announcement no:特開平4-113337  Date announced:1992.4.14

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  • 新規光ファイバ焼灼医療機器の開発~経皮的針生検の合併症低減を目指して~

    Grant number:22K12865  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    馬越 紀行, 櫻井 淳, 深野 秀樹, 都地 友紘, 生口 俊浩

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

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  • 温度センサが集積された広い適用性の極細レーザ照射光ファイバ加熱治療器の研究

    Grant number:22H03975  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    深野 秀樹, 馬越 紀行, 櫻井 淳, 生口 俊浩

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    Grant amount:\17680000 ( Direct expense: \13600000 、 Indirect expense:\4080000 )

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  • 測定点に電源不要な多点光ファイバ遠隔温度計測システムの開発

    2019 - 2020

    科学技術振興機構  産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 機能検証フェーズ 試験研究タイプ 

    深野 秀樹

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    Authorship:Principal investigator 

    光ファイバを通信線路として用い、先端に光ファイバ温度センサを配置する。タンク内の温度測定には、センサ部を挿入するのみで先端部の温度測定ができ、多点のセンサからの光情報を用いて温度を一箇所で集中管理するシステムを構築する新しい取組みの研究開発を行う。

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  • Advanced medical measurement technology using optical fiber

    Grant number:18K04167  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Fukano Hideki

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    We developed a Fabry-Perot interference temperature sensor having two reflection interfaces inside a sensor probe. The sensor demonstrates excellent temperature characteristics with a linear relationship between temperature and interference wavelength. This probe operates using wavelength division multiplexing technique. Laser ablation and temperature monitoring are simultaneously performed using near-infrared semiconductor laser light and light with 1.55 μm wavelength range, respectively. The results demonstrate that the new optical fiber probe for laser ablation has high potential because it can monitor the temperature of the ablation region with fine resolution.
    A graded-index multimode fiber that can provide an imaging by means of different principle with an ordinary fiber scope has been investigated using low dispersion wavelength light. It is confirmed that the light is focused with a distance that is more than 10 times longer than that of conventional technique.

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  • 高精度温度モニタ機能付きレーザ照射光ファイバ温熱治療器

    2014 - 2015

    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 探索タイプ 

    深野 秀樹

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    生体内で選択的に温熱処置を可能とする高精度かつ温度モニタ機能付き光熱変換光ファイバ構造の実現を目指して研究開発を行った。ファイバ先端に新規光干渉構造を考案し,温度により屈折率が変化する被覆材料をファイバ先端部に形成することで,温度を高精度に計測する仕組みを確立した。低侵襲温度測定に望まれる温度分解能は0.6 °Cであり,測定分解能としては,その1/6である0.1 °Cの目標値以下の優れた値を実現した。また,光照射による昇温として,ハイパーサーミアで主にターゲットとなる50 °Cの目標値を,ファイバ先端の工夫により,入射光パワー50 mW以下の低入力で余裕を持って達成できることを明らかにした。今後は,装置としての実用化を目指し,研究開発を進める。

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  • 屈折率と温度の計測可能な長波長帯光ファイバ型センサシステム

    2013

    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 探索タイプ 

    深野 秀樹

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    センサ部となるマルチモードファイバ(MMF)の両端をシングルモードファイバ(SMF)で挟み込んだ構造のマルチモード干渉(MMI)構造において,MMF部分に温度変化によってその屈折率が大きく変化する被覆材料の検討を行い,シリコン樹脂において目標の温度分解能0.01 °C以下を実現した。さらに,本研究では,屈折率と温度を同時に測定できる計測システムの実現を目指し,MMI構造により得られる干渉波形の構造依存性を詳細に調べた。屈折率と温度のそれぞれに対して,異なる干渉波長を構造最適設計により割り当て可能な技術を開発し,MMI構造のタンデム接続を行い,それぞれの干渉波長の変化を計測することにより,屈折率と温度の分離,同時測定が可能であることを明らかにした。

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  • Study of near-infrared surface-plasmon-resonance fiber sensor

    Grant number:24656257  2012.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    FUKANO Hideki, TSURUTA Kenji, TAUE Syuji

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    We have studied a super-high sensitivity fiber sensor by a new detection technique. A metallic thin film or metal nanoparticles have formed on the surface of silica fiber used for optical communication system. The free electrons of the metal surface are excited by the electric field of transmitting light, and then collective oscillation of electrons, called surface plasmon resonance occurs. This induces the phase shift of light. This shift has been detected using a multimode interference produced by the special fiber configuration. We clarified that the resonance wavelength of the light can be controlled by changing the metal structure.

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  • エバネッセント波の干渉を用いる長波長帯光ファイバ屈折率センサ

    2011 - 2012

    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 探索タイプ 

    深野 秀樹

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    マルチモード干渉(MMI)構造光ファイバのセンサ部の長さを変えた場合の干渉スペクトル波形の変化を、波長可変レーザ光源を用いることによって波長分解能を向上させ、高精度に測定できるようにして調べた。この手法で、干渉信号を詳しく調べて行くと、主モードの干渉信号の間の波長において、特異的に干渉が強く、また、そのスペクトル幅の小さい信号が出現するポイントがあることが、明らかとなった。この干渉が得られるMMI長を有するセンサにおいて、入射光波長を光通信波長帯の1540.4nmに固定し、水とエタノールの測定結果より、わずかな屈折率差(0.0266nm@25°C)を、光強度変化(32.4 dB)で検出できた。これは、屈折率を8.2×10^-6の精度で測定できることに対応し、平成24年度の目標値の10^-5以下を達成した。

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