Fiber-coupled terahertz time-domain spectrometer with 10 THz bandwidth using InGaAs photoconductive membranes on silicon

A. Dohms; S. Keyvaninia; M. Gruner; S. Breuer; S. Nellen; L. Liebermeister; M. Schell; R. B. Kohlhaas

doi:10.1117/12.3003030

11 March 2024 Fiber-coupled terahertz time-domain spectrometer with 10 THz bandwidth using InGaAs photoconductive membranes on silicon

A. Dohms, S. Keyvaninia, M. Gruner, S. Breuer, S. Nellen, L. Liebermeister, M. Schell, R. B. Kohlhaas

Author Affiliations +

Proceedings Volume 12885, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII; 1288503 (2024) https://doi.org/10.1117/12.3003030
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

We present a fiber-coupled terahertz (THz) time-domain spectrometer with a record bandwidth of 10 THz. This significant increase of 3.5 THz in bandwidth compared to state-of-the-art spectrometers is enabled by improved photoconductive antennas (PCAs). In particular, we show that THz absorption in the polar InP:Fe substrate of the standard InGaAs PCAs is the main limiting factor for the bandwidth. To overcome this issue, we have developed a wafer-scale substrate transfer-process for the thin photoconductive InGaAs layer from InP:Fe to low loss, high resistivity float-zone (HRFZ) silicon. The resulting photoconductive membrane (PCM) antennas combine the advantages of ultrafast iron-doped InGaAs photoconductors as efficient THz emitters and receivers with nearly absorption-free and spectrally flat transmission of HRFZ-Si up to 17 THz.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

A. Dohms, S. Keyvaninia, M. Gruner, S. Breuer, S. Nellen, L. Liebermeister, M. Schell, and R. B. Kohlhaas "Fiber-coupled terahertz time-domain spectrometer with 10 THz bandwidth using InGaAs photoconductive membranes on silicon", Proc. SPIE 12885, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII, 1288503 (11 March 2024); https://doi.org/10.1117/12.3003030

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