Terahertz optical science and technology in semiconductors

* This project is implemented as ACCEL in the JST-MIRAI R&D Program.

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Research Director

Koichiro Tanaka

Koichiro Tanaka

(Professor, Faculty of Science, Kyoto University)

1990 Dr. of Science, Kyoto University
1990 Research Associate, Institute for solid state physics, The University of Tokyo
1995 Researcher (Group Leader), Hirao-Active-Glass Project (ERATO, JST)
1997 Associate Professor, Department of Physics, Kyoto University
2004 Professor, Department of Physics, Kyoto University
2008-present Adjunct PI,Professor, iCeMS, Kyoto University
2014-present Professor, Department of Physics, Kyoto University

Program Manager

Ryoichi Fukasawa

Ryoichi Fukasawa

(ACCEL Program Manager, Japan Science and Technology Agency)

1989 Ph.D. in Physics, Niigata University
1989 Japan Spectroscopic Corporation
1993 Researcher, Department of Physics, Emory University
1995 Researcher, Communications Research Laboratory, Ministry of Posts and Telecommunications
1998 Tochigi Nikon Corporation
2004 Established Spectra Design Ltd.
2008 President, Spectra Design Ltd.
2017 ACCEL Program Manager, JST

Outline of R&D Project

In our CREST project, we achieved in 2011 a record electric field intensity in the terahertz (THz) region1), as large as 1 MV/cm, and opened up the field of terahertz nonlinear optics. In addition, we realized a high-speed (video rate2)) THz microscope system with a spatial resolution of 1/30 of the wavelength and successfully observed living cells with high resolution in real time. Subsequently, we expanded our research field toward a THz imaging system based on the semiconductor terahertz technology. Through these development activities, we have established the guideline for the proof of concept (POC) in the ACCEL project.
In our ACCEL project, we will improve the output power of semiconductor-based THz emitters and the sensitivity of semiconductor-based THz detectors. By arraying and modularizing THz emitters and detectors, we will construct a basic THz imaging system including optics, control system, and analysis software. The system will facilitate the development of a THz body scanner for security inspection and a THz non-destructive inspection equipment for industrial production, both of which are expected to become important steps in the realization of a safe and secure society.

1) Terahertz region
Frequency band of light wave between 300 GHz (GHz = 109 Hz) and 3 THz (THz = 1012 Hz), which corresponds to 1 mm and 100 μm in wavelength.

2) Video-rate
Frame rate of the conventional video system ranging from 20 Hz to 50 Hz which is valuable for real-time observation.


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