Researcher Database

（Last updated : 2025-01-16 17:13:59）　

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NUMAI Takahiro

Department / Course College of Science and Engineering Department of Electrical and Electronic Engineering

Title / Position Professor

Other Affiliations
1.	Graduate School of Science and Engineering

Academic background
1.	1992/09/14 Degree Acquisition	│ Keio University Ph. D. (Electron device and electronic equipment)
2.	1983/04/01～1985/03/30	Doctoral Program (1st Semester) │ Electrical Engineering Major │ Graduate School, Division of Engineering │ Keio University │ Completed
3.	～1983	Department of Electrical Engineering │ Faculty of Engineering │ Keio University │ Graduated

Business career
1.	1985/04/01 ～ 1994/03/31	│ Opto-Electronics Research Laboratories │ NEC Corporation
2.	1994/04/01 ～ 1997/12/31	Associate Professor │ Research Institute for Electronic Science │ Hokkaido University
3.	1998/01/01 ～ 2003/03/31	│ Canon Research Center │ Canon Inc.

Research activities
1.		The Japan Society of Applied Physics
2.		The Institute of Electronics, Information and Communication Engineers (IEICE)
3.		Physical Society of Japan

Subject of research
1.	Semiconductor Laser
2.	Optical Fiber Transmission System
3.	Color Sensor
4.	Semiconductor Micro-Fabrication Process

Research summary
Quantum Electronics Devices/System I will control interaction (quantum electronics) between material and electromagnetic wave, and create devices and systems with new features installed.

Present specialized field
Keyword：Quantum Electronics, Opto-Electronics, Imprint, Holographic Lithography, Stacked Color Sensor

Books
1.	2019/08/25	Fundamentals of Solid State Physics
2.	2019/08/25	Fundamentals of Materials Science
3.	2015	Fundamentals of Semiconductor Lasers, Second Edition
4.	2013/10/10	Problems and Solutions in Quantum Mechanics for College Students
5.	2012/10/20	Solid State Technology │ ,pp.1-35
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Papers
1.	2022/07/17	Induced Electric Charge Density on Grounded Sphere and Image Electric Charge │ Physics Education in University │ 28 (2),pp.79-82
2.	2022/02/10	Simulation of a ridge‑type semiconductor laser with transversal difraction gratings │ Optical and Quantum Electronics │ 54 (153),pp.1-9
3.	2021/01/25	Over 100 GHz 3‑dB down bandwidth by direct modulation of a coupled cavity DFB‑LD due to photon‑photon resonance │ Optical and Quantum Electronics │ 53 (92),pp.1-12
4.	2020/02	High resonance frequency in a coupled cavity DFB-LD with phase-shifted/uniform gratings by photon-photon resonance │ Optik │ 202,pp.163614
5.	2020/02	High resonance frequency in a coupled cavity DFB-LD with two phase-shifts │ Optical and Quantum Electron. │ 52 (3),pp.1-11
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Academic conference presentation
1.	2024/09/26	Horizontal Transverse Modes in Ridge-Type Laser Diodes with Transversal Diffraction Gratings
2.	2023/09/18	Effect of Flat Region between Mesa and Gratings in Ridge-Type Semiconductor Lasers with Transversal Diffraction Gratings
3.	2022/09/12	Single Transverse Mode Operation of Over 10 micron Wide Ridge-Type Semiconductor Lasers with Transversal Diffraction Gratings
4.	2021/09/14	Simulation of a Ridge-Type Semiconductor Laser with Transversal Diffraction Gratings
5.	2020/09/14	Over 100 GHz 3-dB down Bandwidth by Direct Modulation of a Coupled Cavity DFB-LD due to Photon-Photon Resonance
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Winning science prize
1.	2017/09	Optical Society of America OSA Fellow (For seminal contribution to wavelength/frequency division multiplexing optical fiber communications systems and optical interconnects through the development of wavelength tunable semiconductor lasers/optical filters and system simulation)

E-Mail Address