Influence of Substrate Material on Radiation Characteristics of THz Photoconductive Emitters

Figure 4

Schematic drawing of the setup for measuring radiation patterns (a). The fiber-coupled THz detector is movable in -, -, and -direction with stepper motors. At each position a TDS scan can be performed. The dimension of the active area of the detector antenna is considerably small compared to the THz wavelength. An example of a measured beam profile in -plane is shown for a better understanding of the results (b).

(a)

(b)