Fiber-coupled terahertz time-domain spectrometer with 10 THz bandwidth

We present a fiber-coupled terahertz (THz) time-domain spectrometer with InGaAs photoconductive membranes (PCM) antennas on silicon as emitter and receiver. With these novel antennas we achieve a very high peak dynamic range of 115 dB and a record bandwidth of 10 THz. This represents an increase of 3.5 THz compared to state-of-the art photoconductive antennas (PCAs), which are restricted by THz absorption in the InP:Fe substrate.