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Transient-type stimulated emission in the terahertz frequency range has been achieved from silicon crystals doped by phosphorus and bismuth donors under optical excitation by a few picosecond-long pulses generated by the infrared free electron lasers, FELIX and CLIO. The lasing emission occurs due to a population inversion based mechanism for different interpulse intervals (40 ns, 20 ns, 16 ns, 1...
We applied terahertz (THz) time-domain spectroscopy (THz-TDS) 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...
The optical excitation effect on the transmission of a terahertz pulse through aligned silver nanowires on a silicon substrate was studied. Terahertz pulses almost pass through the silver nanowires without optical excitation. However, the optically excited sample significantly reduces the transmittance, comparing with the excited silicon substrate only.
Terahertz light-matter interactions within a semiconductor-filled waveguide can be tuned in space and time via photoexcited regions created on ultrafast time scales and sub-THz wavelength length scales by a patterned optical pulse. These light-induced metal-dielectric structures can be used to dynamically modify the photonic band structure of THz light within the waveguide, controlling the amplitude,...
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