High switching contrast photoconductive terahertz detectors based on plasmonic nanocavities

Mona Jarrahi; Nezih T Yardimci

doi:10.1117/12.2591168

5 March 2021 High switching contrast photoconductive terahertz detectors based on plasmonic nanocavities

Mona Jarrahi, Nezih T Yardimci

Proceedings Volume 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV; 116850W (2021) https://doi.org/10.1117/12.2591168
Event: SPIE OPTO, 2021, Online Only

Abstract

We present a photoconductive terahertz detector, which offers high-sensitivity and broadband detection performance for terahertz time-domain spectroscopy at record-low optical pump power levels. The detector employs a plasmonic nanocavity designed to confine the optical pump photons in a thin photoconductive region. By providing an efficient optical absorption in this thin layer, the carrier transport time to the device contact electrodes is maintained in a sub-picosecond range for the majority of the photo-generated carriers. Therefore, ultrafast operation and high quantum efficiency is achieved simultaneously, which significantly increases the detector responsivity and dynamic range even at very low optical pump power levels. We experimentally demonstrate a 110 dB dynamic range over a 0.1-7 THz frequency range at only a 0.1 mW optical pump power level.

Conference Presentation

Citation Download Citation

Mona Jarrahi and Nezih T Yardimci "High switching contrast photoconductive terahertz detectors based on plasmonic nanocavities", Proc. SPIE 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV, 116850W (5 March 2021); https://doi.org/10.1117/12.2591168

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