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Subpicosecond, freely propagating electromagnetic pulse generation and detection using GaAs:As epilayers
(AIP Publishing, 1991-04-08)
Using GaAs epilayers with arsenic precipitates (GaAs:As) as the photoconductive material in a broad-band optoelectronic terahertz beam system, we have generated and detected freely propagating, subpicosecond electromagnetic ...
Efficient generation of 380 fs pulses of THz radiation by ultrafast laser pulse excitation of a biased metal-semiconductor interface
(AIP Publishing, 1991-01-21)
We have demonstrated a new method of generating pulses of freely propagating THz electromagnetic radiation. The resulting 380 fs pulses are the shortest directly measured THz pulses in free space to date and are more ...
THz commensurate echoes: Periodic rephasing of molecular transitions in free-induction decay
(American Physical Society, 1991-04-08)
We report the first study of coherent transients excited by ultrafast pulses of THz radiation. Using a newly developed optoelectronic source of well-collimated beams of subpicosecond pulses of THz radiation to excite N2O ...
Trap-enhanced electric fields in semi-insulators: The role of electrical and optical carrier injection
(AIP Publishing, 1991-10-14)
We report extremely large field enhancement near the anode of an electrically biased metal/semi-insulator/metal structure. The large anode field results from a trap-enhanced space-charge region and is large enough to cause ...