  The emission properties of terahertz(THz) photoconductive antenna (PCA) have
been numerically studied by three-dimensional finite-difference-time-domain
method based on the full-wave model. The dependence of the THz radiation on
various parameters, such as laser power, bias voltage, substrate's material,
pulse duration of the laser, beam spot's size, dimension of the antenna, were
comprehensively simulated and analyzed. This work, on one hand, reveals the
internal relationship between the THz radiation of a PCA and the involved
parameters, so that one can have a better understanding of the PCA. On the
other hand, it can inspire new PCA's design that aims at improved performance,
such as high radiation power, enhanced optics-to-THz conversion efficiency, and
broadband spectrum.
