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...
Koji Uematsu   Ken-ichiro Maki   Chiko Otani   
OPTICS EXPRESS 20(20) 22914-22921 2012年9月 [査読有り]
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...
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...
Koji Uematsu   Ken-ichiro Maki   Chiko Otani   
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...
It was formerly confirmed by experiment that hypervelocity impacts on aluminum plates cause microwave emission. In this study, we have carried out experiments in order to clarify the mechanism of the emission. The microwave is detected by heterody...
We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz radiation at higher frequencies into free space...
We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz radiation at higher frequencies into free space...