Multi-channel detection of ultrashort THz-pulses based onphotoconductive antennas

摘要

We report on multi-channel detection of ultrashort THz pulses by a linear array of 16 photoconductive dipole antennas. The dipole antennas built on low-temperature grown GaAs are excited by a line focus of fs-pulses. By the parallel detection of a complete line of ultrashort THz pulses, the measurement speed of THz ultrashort pulse time domain systems can be accelerated by an order of magnitude. For demonstration, the THz beam profile along the line detector is determined, and its spectral dependence of the electric field distribution is compared and verified by wave-optical simulations.