Graduate school of engineering
/Research Center for Ultra-High Voltage Electron Microscopy,
The University of Osaka, JAPAN
Research projects visualizing excited carriers in semiconductors
(Shuhei ICHIKAWA' research group)
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Welcome to our research page!
This webpage presents research achievements and other information of research projects led by Shuhei ICHIKAWA working as an Associate Professor in Graduate School of Engineering, The University of Osaka.
Our research group focuses on characterization of physical properties and fabrication of devices using next-generation semiconductor materials, such as GaN, SiC, and perovskite. Please feel free to contact us if you are interested in our research activities and collaboration.
News!!
News!!
2026/7/22
A press release has been published regarding a project on "Development of novel optical devices using host-guest semiconductor materials".
One LED, four stable colors!
https://resou.osaka-u.ac.jp/en/research/2026/20260722_12026/7/1
A paper regarding a project on "Development of novel optical devices using host-guest semiconductor materials" has been published. The paper is selected as an Editor's Pick in Applied Physics Letters.
S. Yamazaki, S. Ichikawa, T. Iwaya, J. Tatebayashi, and Y. Fujiwara,
"Ultra-stable multiple emission wavelengths produced by Tb-doped AlxGa1-xN-based light-emitting diodes",
Applied Physics Letters 128(26), 261112 (2026).
DOI: 10.1063/5.03317342026/5/11
A press release has been published regarding a project on "Development of novel optical devices using host-guest semiconductor materials".
Brighter, more stable red LEDs for next-generation micro-LED displays!
https://resou.osaka-u.ac.jp/en/research/2026/20260511_12026/4/10
A press release has been published regarding a project on "Fabrication of integrable optical-polarization-controlled devices".
An advance in single-chip, energy-efficient LEDs!
~New LEDs structure reduces energy loss and enables compact light sources for AR/VR, 3D displays, and quantum technologies~
https://resou.osaka-u.ac.jp/en/research/2026/20260410_12026/4/1
Associate Prof. Shuhei ICHIKAWA was selected as "Outstanding Young Researcher" in Center for Future Innovation (CFi), Graduate School of Engineering, The University of Osaka.
We promotes a research project on "Pioneering Research on Combinational Analyses of Electron & Luminescence Spectroscopy Visualizing Excited Carriers in Semiconductors".2026/3/19
A press release has been published regarding a project on "Fabrication of integrable optical-polarization-controlled devices".
Tiny LED design could power next-generation technology!
~Proposal of a compact LED design that directly emits circularly polarized light, potentially simplifying optical devices~
https://resou.osaka-u.ac.jp/en/research/2026/20260319_32026/3/19
A paper regarding a project on "Development of novel optical devices using host-guest semiconductor materials" has been published.
A. Takeo, S. Ichikawa, D. Timmerman, J. Tatebayashi, and Y. Fujiwara,
"Preferential formation of highly efficient Eu luminescent centers in Eu-doped GaN grown on semipolar (20-21) GaN",
Applied Physics Letters 128(11), 113304 (2026).
DOI: 10.1063/5.03084002026/3/12
A paper regarding a project on "Fabrication of integrable optical-polarization-controlled devices" has been published.
Yuki Murata, Shintaro Toda, Yasufumi Fujiwara, Kazunobu Kojima, and Shuhei Ichikawa,
"Metasurface-integrated semipolar (20-21) InxGa1-xN quantum wells towards efficient circularly-polarized LEDs",
Optical Materials Express 16(4), 924 (2026).
DOI: 10.1364/OME.5886322026/2/27
Feature article written by Associate Prof. Shuhei ICHIKAWA regarding "Fabrication of integrable optical-polarization-controlled devices" has been published.
"メタサーフェスを直接結合したInGaN 単一円偏光デバイスの設計と作製",
Electronics Stage 1(5), 38 (2026).
https://www.gijutu.co.jp/doc/magazine/es_2026_02.htm2026/2/26
A paper regarding a project on "Fabrication of integrable optical-polarization-controlled devices" has been published.
Yohei Taguchi, Yuki Murata, Kyohei Suzuki, Shintaro Toda, Hiroshi Tabata, Kazunobu Kojima, and Shuhei Ichikawa,
"Circularly polarized (0001) InGaN-based LED integrated with GaN metasurface",
Optics Letters 51(5), 1287 (2026).
DOI: 10.1364/OL.587468
Upcoming schedules
Upcoming schedules
2026/6/21-25
Associate Prof. Shuhei ICHIKAWA gave an invited talk in CIMTEC 2026 (10th Forum on New Materials)@Perugia, Italy.
"Time-resolved Photoemission Spectroscopy for Evaluation of Surface Carrier Recombination in Semiconductors"2026/4/20-24
Associate Prof. Shuhei ICHIKAWA gave an invited talk in ALPS 2026 (The 15th Advanced Lasers and Photon Sources)@ Yokohama, Japan.
"Circularly Polarized InGaN Light Emitters Integrated with Metasurface"2026/3/15-18
Hodaka Kubo, Takuto Shintani, and Yuya Hinokuchi attended The 73rd JSAP Spring Meeting 2026 and gave oral presentations.2025/9/7-10
Kouki Mochizuki, Sota Komiyama, Daichi Tanaka, Ryo Kuchino, and Yuki Monnai attended The 86th JSAP Autumn Meeting 2025 and gave oral presentations.2025/3/26
Associate Prof. Shuhei ICHIKAWA gave an invited talk in IIIN-MPD (Advances in III-Nitride Materials & Photonic Devices) @Technical University of Berlin, Germany (Online webinar series, Invited lecturer).
"Impact of killer defects in Al-rich AlGaN on DUV luminescent properties "2024/12/1-6
Associate Prof. Shuhei ICHIKAWA gave an oral presentation in 2024 MRS Fall Meeting (Ultrafast Surface Carrier Recombination in Semiconductors Evaluated by Two-photon Photoemission Spectroscopy ).
"Ultrafast Surface Carrier Recombination in Semiconductors Evaluated by Two-photon Photoemission Spectroscopy "
Archived achievements
Archived achievements
2025/7/25
Associate Prof. Shuhei ICHIKAWA has been awarded a grant "JST FOREST Program (Grant Number JPMJFR243V Japan) [the PANEL headed by Prof. Junichiro SHIOMI]". We promotes a research project on "Ultra-fine 4D detection of excited carriers in semiconductors utilizing an opto-electronic probes".2025/4/1
Associate Prof. Shuhei ICHIKAWA has been awarded a Grant-in-Aid for Scientific Research (B) (No. 25K00063, 2025/4～2029/3). We promotes a research project on "Development of highly-efficient polarized emitters based on the control of electronic and optical states towards integration in microscale".
Past schedules
Past schedules
2024/11/30
市川修平 准教授がOPJ2024 (Optics & Photonics Japan 2024)@電気通信大学において招待講演を行いました。
"メタサーフェス一体型InGaN円偏光デバイスの設計と作製 "2024/11/3-8
Associate Prof. Shuhei ICHIKAWA gave an invited talk in IWN2024 (The 12th International Workshop on Nitride Semiconductors)@Hawai’i, USA.
"Surface Carrier Dynamics of Nitride Semiconductors Evaluated by Time-resolved Photoemission Spectroscopy "2024/7/2-3
市川修平 准教授が応用物理学会 応用電子物性分科会/結晶工学分科会 合同研究会@京都テルサにおいて招待講演を行いました。
"光電子分光を活用した窒化物半導体表面でのキャリアダイナミクス評価 "2024/4/24-25
Associate Prof. Shuhei ICHIKAWA gave an invited talk in LEDIA2024 (10th International Conference on Light-Emitting Devices and Their Industrial Applications)@Yokohama, Japan.
"Combinational integration of Eu-doped GaN and InGaN LEDs and their prospects for miniaturization "2024/3/3-7
Associate Prof. Shuhei ICHIKAWA gave an invited talk in ISPlasma2024 (16th International Conference on Advanced Plasma Science and Its Application to Nitrides and Nanomaterials) @Nagoya Nagoya, Japan.
"Hybrid Integration of Eu-Doped GaN and InGaN LEDs towards Ultrahigh Definition Micro LED Display"2024/3/1
市川修平 准教授がワイドギャップ半導体学会（WideG）第15回研究会「UV系デバイス」@コモレ四谷タワーコンファレンスにおいて招待講演を行いました。
"成長表面の異なる深紫外AlGaN量子井戸の結晶成長と光物性"2024/1/26
市川修平 准教授が電子情報通信学会 発光型／非発光型ディスプレイ合同研究会@龍谷大学 響都ホール校友会館において招待講演を行いました。
"マイクロLEDディスプレイ実現に向けたGaN系RGB LEDのモノリシック集積と微細化に向けた展望"
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