PROCEEDINGS OF THE IEEE 101(6) 1438-1447 2013年6月 [査読有り]
A solar power satellite (SPS) is a renewable energy system that converts the sun's energy into electricity in space and transmits it to Earth using microwaves. The SPS concept, first proposed in 1968 in the United States, has recently started attr...
A terahertz (THz) beam steering method is demonstrated by applying the characteristic of grating lobe (GL) radiation from a linear array antenna and the interference of femtosecond optical pulses. A photoconductive device is illuminated by two fem...
Ken-ichiro Maki Takayuki Shibuya Chiko Otani Koji Suizu Kodo Kawase
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES 32(5) 603-617 2011年5月 [査読有り]
We have investigated the characteristics of a terahertz (THz) beam steering method based on a combination of difference-frequency generation (DFG) with the principle of the phased array antenna. In the DFG of THz radiation from a nonlinear optical...
2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2011年 [査読有り]
We present a THz beam steering method that is based on the generation of grating lobe(GL) radiation from linear array antenna and interference principle of femtosecond laser beam. THz GL radiation with the bandwidth of 110GHz was generated from a ...
35TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ 2010) 2010年 [査読有り]
The generation of terahertz (THz) radiation is demonstrated by using the spatial dispersion of an femtosecond optical pulse. The overlap of two dispersed beams with a spatial shift allows us to generate a narrowband radiation on the basis of photo...
2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2012 - Proceedings 131-134 2012年 [査読有り]
Toward the orbital demonstration of a solar power satellite (SPS), a breadboard model of the SPS has been developed for preliminary experiments including wireless power transmission. The model forms a thin panel structure with a thickness of 6 cm,...
Koji Tanaka Maki Kenichiro Masashi Takahashi Tadashi Ishii Susumu Sasaki
2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2012 - Proceedings 191-194 2012年 [査読有り]
We are developing a bread board model for a microwave wireless power transmission (WPT) from a satellite in orbit to the ground. WPT using microwaves is one of the critical and important technologies toward a solar power satellite (SPS). We have c...
Ken-ichiro Maki Takayuki Shibuya Chiko Otani Koji Suizu Kodo Kawase
APPLIED PHYSICS EXPRESS 2(2) 022301 2009年2月
Terahertz (THz) beam steering is demonstrated based on the phased-array antenna principle without using actual phase shifters. A periodically-poled lithium niobate crystal is pumped with infrared radiation generated from a dual-wavelength optical ...
Ken-ichiro Maki Takayuki Shibuya Chiko Otani Koji Suizu Kodo Kawase
APPLIED PHYSICS EXPRESS 2(2) 022301 2009年2月
Terahertz (THz) beam steering is demonstrated based on the phased-array antenna principle without using actual phase shifters. A periodically-poled lithium niobate crystal is pumped with infrared radiation generated from a dual-wavelength optical ...
M. Theuer D. Molter K. Maki C. Otani J. A. L'huillier R. Beigang
APPLIED PHYSICS LETTERS 93(4) 041119 2008年7月
We report on terahertz generation by Cherenkov-type optical rectification in lithium niobate using an actively controlled femtosecond pumped enhancement cavity. In this way a much higher pump power is available inside the cavity and an increased t...
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