Fiber Coupled Transceiver with 6.5 THz Bandwidth for Terahertz Time-Domain Spectroscopy in Reflection Geometry

Robert B Kohlhaas; Lars Liebermeister; Steffen Breuer; Marcel Amberg; David de Felipe; Simon Nellen; Martin Schell; Björn Globisch

doi:10.3390/s20092616

Fiber Coupled Transceiver with 6.5 THz Bandwidth for Terahertz Time-Domain Spectroscopy in Reflection Geometry

Sensors (Basel). 2020 May 4;20(9):2616. doi: 10.3390/s20092616.

Authors

Robert B Kohlhaas¹, Lars Liebermeister¹, Steffen Breuer¹, Marcel Amberg¹, David de Felipe¹, Simon Nellen¹, Martin Schell^{1

2}, Björn Globisch^{1

2}

Affiliations

¹ Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Einsteinufer 37, 10587 Berlin, Germany.
² Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, EW 5-1, 10623 Berlin, Germany.

Abstract

We present a fiber coupled transceiver head for terahertz (THz) time-domain reflection measurements. The monolithically integrated transceiver chip is based on iron (Fe) doped In_0.53Ga_0.47As (InGaAs:Fe) grown by molecular beam epitaxy. Due to its ultrashort electron lifetime and high mobility, InGaAs:Fe is very well suited as both THz emitter and receiver. A record THz bandwidth of 6.5 THz and a peak dynamic range of up to 75 dB are achieved. In addition, we present THz imaging in reflection geometry with a spatial resolution as good as 130 µm. Hence, this THz transceiver is a promising device for industrial THz sensing applications.

Keywords: THz imaging; THz time-domain spectroscopy; THz transceiver; non-destructive testing; photoconductive antennas.

Grants and funding

2533/2-1/Deutsche Forschungsgemeinschaft