We report on the application of a photoconductive frozen wave generator (FWG) for the generation of 0.36-THz radiation. Through the excitation of a bipolar photoconductive array, a two-cycle THz electrical transient is created. The THz electrical transient occurs on a time scale much shorter than the carrier lifetime in the semiconductor. Furthermore, variations in the uniformity of the optical excitation intensity across the photoconductive array introduce a controlled THz temporal chirp, thus providing for fine bandwidth tunability of the device. Modeling of the FWG is successful in describing both the time variation and the amplitude spectrum of the photogenerated THz radiation.
© 2000 Optical Society of America
[Optical Society of America ]
(130.5990) Integrated optics : Semiconductors
(320.5390) Ultrafast optics : Picosecond phenomena
(320.7080) Ultrafast optics : Ultrafast devices
(320.7160) Ultrafast optics : Ultrafast technology
Jonathan F. Holzman, Fred E. Vermeulen, and Abdul Y. Elezzabi, "Frozen wave generation of bandwidth-tunable two-cycle THz radiation," J. Opt. Soc. Am. B 17, 1457-1463 (2000)