Abstract
A photoconductive antennas (PCA) are fed by a femtosecond pulsed laser and a DC bias voltage to generate the terahertz (THz) radiation. The physical modeling of these systems requires both carrier dynamic and Maxwell's equations at the same time. The generated THz photocurrent acts as a current source for the antenna. Due to their very low efficiency, the applied laser power and the DC bias are increased as much as possible to generate more photocurrent and as a result, more THz radiation. In these situations, the physical modeling of the PCA requires a more accurate model than the current models, which are based on the drift-diffusion equations. We have used energy balance transport model to explain the physical phenomena, which are responsible for generating more photocurrent. In this model, saturation of the DC photocurrent and velocity overshoot phenomenon are predicted based on Hot carrier effect.
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