Terahertz Receivers for Time-Domain Spectroscopy Made of Transition Metal Doped InGaAs: Up to 105 dB Dynamic Range

Transition metal doped photoconductors are investigated as terahertz (THz) receivers in time-domain spectroscopy (TDS). Compared to state-of-the-art receivers based on low-temperature-grown InGaAs/lnAIAs, rhodium-doped InGaAs receivers allow for an improvement in dynamic range (DR) of 15 dB over the whole spectral range, resulting in a peak DR of 105 dB. This improvement increases the resolution in nondestructive testing applications of thin films with THz TDS.