The conduction current and displacement current in a Terahertz antenna

A semiclassical Monte Carlo model is presented to study the time-varying conduction current and displacement current in a Terahertz photoconductive antenna after photoexcitation. We analyzed conduction current and displacement current in a biased GaAs photoconductive antenna after fs laser pulse excitation as a function of bias voltage, pump pulse energy. While we analyzed conduction current and displacement current contribute on THz wave radiation. The simulation results show that the light-intensity dependence mainly influences the pulse amplitudes of the conduction current and the displacement current and THz wave. At the same light-intensity, higher bias field gives larger conduction current. The simulation results show that conduction current and displacement current are source of THz waveform radiated by bias photoconductive current.