Photoconductive THz detectors based on iron doped InGaAs with 4.5 THz bandwidth

We present continuous-wave terahertz (cw THz) detectors employing iron doped InGaAs as photoconductive material. The iron doped photoconductor shows improved properties compared to low-temperature grown InGaAs used in many state-of-the-art cw THz detectors. We fabricated photoconductive antennas on Fe-doped InGaAs, which allow for a bandwidth of 4.5 THz with 112 dB peak dynamic range in a coherent setup for the first time.