Journal Article Mechanism of relativistic Doppler reflection from a photo-induced moving plasma front studied by terahertz time-domain spectroscopy

河野, 七瀬  ,  板倉, 隆二  ,  坪内, 雅明

94 ( 15 )  , p.155205 , 2016-10 , the American Physical Society
We applied terahertz (THz) time-domain spectroscopy to reveal the mechanism of the relativistic Doppler reflection of THz light from a photo-induced plasma front in a silicon wafer. The frequency up-shift caused by the Doppler reflection was identified by measurement of the reflected THz waveforms and compared to the calculated results obtained using the one-dimensional finite-difference time-domain method. The relation between the energy density of the pump light and the frequency up-shift was also explored. We found that the interaction time of the moving plasma front and the reflected THz pulse is a key factor in understanding the mechanism of the relativistic Doppler reflection.

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