Generation Of Terahertz Radiation From Semiconductor Optoelectronic Devices

Recently, we observed terahertz radiation induced by femtosecond optical excitation of semiconductor optoelectronic devices [ 1). In the first part of this talk, we present a systematic experimental study of the physical origin of this THz radiation. In the second part, we study electron velocity overshoot in bulk GaAs under high bias field using THz radiation as a probe.