Influence of Substrate Material on Radiation Characteristics of THz Photoconductive Emitters

Figure 2

Schematic of a standard THz-TDS experimental setup. The optical pulse is split into two halves. The one through the beam splitter reaches the emitter antenna after a fixed flight time and gives rise to the THz pulse to be emitted into the free space and travel through THz optics to the detector. The reflected part of the optical pulse is delayed by means of the delay line before reaching the detector antenna against the arrival time of the THz pulse. Depending on the delay line position the optical pulse “opens” the antenna to detect different elementary sections along the electric field amplitude envelope of THz pulse.