We investigate the reflection near the reststrahlen band of the optical phonon in bulk GaAs in the time domain, using time-resolved terahertz spectroscopy. We find that the dynamics of the reflection measured for GaAs differs strongly from the reflection dynamics that would be expected for a TO phonon with a frequency-independent dephasing time.
© 2000 Optical Society of America
(300.6250) Spectroscopy : Spectroscopy, condensed matter
(300.6270) Spectroscopy : Spectroscopy, far infrared
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
G. C. Cho, P. Y. Han, X.-C. Zhang, and H. J. Bakker, "Optical phonon dynamics of GaAs studied with time-resolved terahertz spectroscopy," Opt. Lett. 25, 1609-1611 (2000)