Optical phonon dynamics of GaAs studied with time-resolved terahertz spectroscopy
Opt. Lett. , Volume 25 p. 1609- 1611
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.