Ultrabroadband Detection of Terahertz Radiation from 0.1 to 100 THz with Photoconductive Antenna

We demonstrate ultrabroadband detection of terahertz electric field from 0.1 up to 100 THz with a dipole-type photoconductive antenna using an ultrashort pulse laser whose pulse width is approximately 10 fs. Ultrabroadband terahertz pulses are generated with a thin GaSe crystal and a low-temperature grown GaAs photoconductive antenna. The sensitivity of the photoconductive antenna is examined in mid-infrared region.