学術論文
2024
- High-efficiency green light emission from InGaN/GaN using localized surface plasmon resonance tuned by combination of Ag nanoparticles and dielectric thin film
Yuki Kamei, Seiya Kaito, Tetsuya Matsuyama, Kenji Wada, Mitsuru Funato, Yoichi Kawakami, and Koichi Okamoto
Optics Express 32(12), 21389-21399 (2024) https://doi.org/10.1364/OE.521486 - Evaluation of Phototoxicity of Short-Wavelength Laser Light Utilizing PCNA Accumulation
Tetsuya Matsuyama1*, Noboru Osaka1, Mikiya Yamaguchi1, Naohiro Kanamaru1, Kenji Wada1, Ai Kawakita2, Kaori Murata2, Kenji Sugimoto2, Koichi Okamoto1*
Micromachines 2024, 15(5), 646. https://doi.org/10.3390/mi15050646 - Effect of thermal annealing on the surface plasmon properties of gold and silver nanodisk structures fabricated by electron beam lithography
Kota Yamasaki, Masaki Ozawa, Ryohei Hatsuoka, Tetsuya Matsuyama, Kenji Wada, and Koichi Okamoto
Optical Materials Express 14(5), 1349-1358 (2024) https://doi.org/10.1364/OME.521588 - Design and Optimization of Silver Nanostructured Arrays in Plasmonic Metamaterials for Sensitive Imaging Applications
Koichi Okamoto1, Daisuke Tanaka2, Tetsuya Matsuyama1, Kenji Wada1, Yusuke Arima3 and Kaoru Tamada3
Photonics 2024, 11(4), 292; https://doi.org/10.3390/photonics11040292 - Novel Plasmonic Metamaterials Based on Metal Nano-Hemispheres and Metal-Dielectric Composites
Rei Niguma,Tetsuya Matsuyama,Kenji Wada and Koichi Okamoto*
Photonics 2024, 11(4), 356; https://doi.org/10.3390/photonics11040356 - Ultrasonic velocity change imaging of a human forearm
Koki Nakata1*, Kenji Wada1*, Tetsuya Matsuyama1, Koichi Okamoto1, and Toshiyuki Matsunaka2
Jpn. J. Appl. Phys. 63, 04SP41 (2024) https://doi.org/10.35848/1347-4065/ad32e1
2023
- Spatial and time-resolved properties of emission enhancement in polar/semi-polar InGaN/GaN by surface plasmon resonance
Kento Ikeda , Kanata Kawai , Jun Kametani , Tetsuya Matsuyama , Kenji Wada , Narihito Okada , Kazuyuki Tadatomo and Koichi Okamoto
Nanophotonics, 2024. https://doi.org/10.1515/nanoph-2023-0758 - Propagation loss in polyfluorene waveguides due to nanometer-roughness at their interfaces, studied by amplified spontaneous emission measurements
Hironobu Azuma1, Koichi Okamoto1 and Hiroyoshi Naito2,3
Jpn. J. Appl. Phys, 63(2), 02SP02 (2024) - Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy
Kenji Wada, Tokihiro Kitagawa, Tetsuya Matsuyama, Koichi Okamoto
Spectroscopy Journal 1(3), 137-151 (2023) - Plasmonic red-light-emission enhancement by honeycomb-latticed InGaN/GaN ordered fine nanocolumn arrays
Takao Oto1, Aoto Aihara1, Kai Motoyama2, Shunsuke Ishizawa2, Koichi Okamoto3, Rie Togashi2,4 and Katsumi Kishino2,4
Appl. Phys. Express, 16, 115001 (2023) - ライブセルイメージングを用いた青色レーザー照射による光毒性の定量評価
大坂 昇 1，松山 哲也 1，和田 健司 1，岡本 晃一 1，川喜多 愛 2， 村田 香織 2，杉本 憲治 2
レーザー研究, Vol. 51, No. 6, 393-398 - Plasmonic Metamaterial Ag Nanostructures on a Mirror for Colorimetric Sensing
Sayako Maeda, Noboru Osaka, Rei Niguma, Tetsuya Matsuyama, Kenji Wada, and Koichi Okamoto
Nanomaterials 2023, 13(10), 1650 - Flexible tuning of the peak wavelength and intensity of localized surface plasmon resonance by heat treatment of nanodisk structures fabricated by electron beam lithography
Osaka, Noboru; Ozawa, Masaki; Matsuyama, Tetsuya; Wada, Kenji; Okamoto, Koichi
Optical Materials Express 13(5), 1504-1512 (2023) - Enhancement of the bandgap emission from GaN epilayer by surface plasmon resonance in the quadrupole oscillation mode using Ag nanoparticles protected by an oxide thin film
Seiya Kaito, Tetsuya Matsuyama, Kenji Wada, Mitsuru Funato, Yoichi Kawakami, and Koichi Okamoto
Appl. Phys. Lett. 122, 151110 (2023) - プラズモニクスに基づくIII-V 族窒化物半導体の高効率緑色発光
岡本晃一，垣内晴也，亀井勇希，松山哲也，和田健司，船戸充，川上養一
レーザー研究，Vol. 51, No. 2, 97-102 (2023)
2022
- Deep-ultraviolet localized surface plasmon resonance using Ga nanoparticles
Soshi Endo, Kohei Shimanoe, Tetsuya Matsuyama, Kenji Wada, and Koichi Okamoto
Optical Materials Express Vol. 12, Issue 7, pp. 2444-2452(2022) - Unraveling the reasons behind lead phthalocyanine acting as a good absorber for near‑infrared sensitivedevices
Masahiro Kato, Hayato Yoshizawa, Masato Nakaya, Yasutaka Kitagawa, Koichi Okamoto, Tomoaki Yamada, Masahito Yoshino, Kentaro Tanaka, and Jun Onoe
Scientific Reports, 12(1), 8810(2022) - 超音波速度変化イメージング法の生体への適用条件の検討
和田健司，園田華，南裕貴，伊藤祐輝，松山哲也，岡本晃一，松中敏行
超音波TECHNO，Vol. 34, No. 4, 75-79 (2022)
2021
- Plasmonics and Plasmonic Metamaterials Using Random Metal Nanostructures for Highly Efficient Light-Emitting Devices
Koichi Okamoto
Journal of the Imaging Society of Japan, 60(2021), 631-648 - 近赤外線デバイスの高効率化に向けたプラズモン共鳴波長の制御
島ノ江考平，長谷川遼，松山哲也，和田健司，岡本晃一
日本赤外線学会誌, 31 (2021), 139 - Transient Nascent Adhesion at the Initial Stage of Cell Adhesion Visualized on a Plasmonic Metasurface
Shi Ting Lee, Thasaneeya Kuboki, Satoru Kidoaki, Yukiko Aida, Sou Ryuzaki, Koichi Okamoto, Yusuke Arima, Kaoru Tamada
Advanced Nanobiomed Research, 2(2022), 2100100 - Comparison of surface plasmon polariton characteristics of Ag- and Au-based InGaN/GaN nanocolumn plasmonic crystals
徳永和成，内藤勇志，松山哲也，和田健司，岡本晃一
日本赤外線学会誌, 30(1), 69-74(2020) - Tuning the Emission Colors of Self-Assembled Quantum Dot Monolayers via One-Step Heat Treatment for Display Applications
Takao Oto, Masato Namazuta, Shotaro Hayakawa, Koichi Okamoto, Rie Togashi and Katsumi Kishino
Appl. Phys. Express 14(2021), 105002 - Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells
Masahiro Kato, Masato Nakaya, Shinta Watanabe, Koichi Okamoto, and Jun Onoe
AIP Advances 11(2021), 075227 - Effect of chemically induced permittivity changes on the plasmonic properties of metal nanoparticles
N. Saito, S. Ryuzaki, Y. Tsuji, Y. Noguchi, R. Matsuda, P. Wang, D. Tanaka, Y. Arima, K. Okamoto, K. Yoshizawa & K. Tamada
Communications Materials, 2(2021), 54
2020
- Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror
Koichi Okamoto, Kota Okura, Pangpang Wang, Sou Ryuzaki and Kaoru Tamada
Nanophotonics, 9(2020), 3409-3418 - Localized surface plasmon resonance in deep ultraviolet region below 200 nm using a nanohemisphere on mirror structure
Kohei Shimanoe, Soshi Endo, Tetsuya Matsuyama, Kenji Wada and Koichi Okamoto
Scientific Reports, 11(2021), 5169. - Metallic nanovoid and nano hemisphere structures fabricated via simple methods to control localized surface plasmon resonances in UV and near IR wavelength regions
Kohei Shimanoe, Soshi Endo, Tetsuya Matsuyama, Kenji Wada and Koichi Okamoto
Appl. Phys. Express 14(2021),042007 - 近赤外光パルスの線形相互相関を利用した光ファイバーの熱時定数測定
徳永和成，内藤勇志，松山哲也，和田健司，岡本晃一
日本赤外線学会誌, 30(1), 69-74(2020) - Tuning the Emission Colors of Self-Assembled Quantum Dot Monolayers via One-Step Heat Treatment for Display Applications
Junfu Leng, Yang Xu, Yinthai Chan, Pangpang Wang, Sou Ryuzaki, Koichi Okamoto, and Kaoru Tamada
ACS Applied Nano Materials, 3(2020), 3214-3222 - Finite-difference time-domain simulations of inverted cone-shaped plasmonic nanopore structures
Rintaro Matsuda, Sou Ryuzaki, Koichi Okamoto, Yusuke Arima, Makusu Tsutsui, Masateru Taniguchi, and Kaoru Tamada
Journal of Applied Physics, 127(2020), 243109 - Morphological and optical properties of α- and β-phase zinc (||) phthalocyanine thin films for application to organic photovoltaic cells
Masahiro Kato, Masato Nakaya, Yuki Matoba1, Shinta Watanabe, Koichi Okamoto, Jean-Pierre Bucher, and Jun Onoe
Journal of Chemical Physics, 153 (2020), 144704 - High Axial and Lateral Resolutions on Self-Assembled Gold Nanoparticle Metasurfaces for Live-Cell Imaging
Shihomi Masuda, Thasaneeya Kuboki, Satoru Kidoaki, Shi Ting Lee, Sou Ryuzaki, Koichi Okamoto, Yusuke Arima, and Kaoru Tamada
ACS Applied Nano Materials, 3(2020), 11135-11142 - Layer Number-Dependent Enhanced Photoluminescence from a Quantum Dot Metamaterial Optical Resonator
Haruka Takekuma, Junfu Leng, Kazutaka Tateishi, Yang Xu, Yinthai Chan, Sou Ryuzaki, Pangpang Wang, Koichi Okamoto, and Kaoru Tamada
ACS Applied Electronic Materials, 3(2021), 468-475 - Evaluation of high-stability optical beats in laser chaos by plasmonic photomixing
Fumiyoshi Kuwashima, Mona Jarrahi, Semih Cakmakyapan, Osamu Morikawa, Takuya Shirao, Kazuyuki Iwao, Kazuyoshi Kurihara, Hideaki Kitahara, Takashi Furuya, Kenji Wada, Makoto Nakajima, and Masahiko Tani
Optics Express 28(2020), 24833-24844 - 多モード半導体レーザーの利得変調動作におけるノイズの影響
和田健司
レーザー研究, 48(2020), 218-223