Efficient photoconductive terahertz detection through photon trapping in plasmonic nanocavities

Yardimci, N. T.; Turan, D.; Jarrahi, M.

doi:10.1063/5.0055332

Title: Efficient photoconductive terahertz detection through photon trapping in plasmonic nanocavities

Journal Article · 10 August 2021 · APL Photonics

DOI: https://doi.org/10.1063/5.0055332 · OSTI ID:1852356

^[1]; Turan, D. ^[2];

^[2]

Lookin, Inc., Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States)

We present a photoconductive terahertz detector that employs a plasmonic nanocavity to offer high-sensitivity and broadband operation when used in a terahertz time-domain spectroscopy system even at very low optical pump power levels. By employing a plasmonic nanocavity, all of the photocarriers are generated within a 100 nm distance from the photoconductor contact electrodes, enabling a short transport time for almost all of the photogenerated carriers. As a result, the photoconductive detector maintains high quantum efficiency and ultrafast operation simultaneously, enabling high-sensitivity and broadband operation at very low optical pump power levels. We utilize a photoconductive detector based on a plasmonic nanocavity optimized for operation at a 770 nm optical wavelength in a terahertz time-domain spectroscopy system and demonstrate a 100 dB signal-to-noise ratio and a 0.1–6 THz noise-equivalent bandwidth at a record-low average optical pump power of 0.1 mW, compared to the state-of-the-art photoconductive terahertz detectors. The extremely low optical power budget of the demonstrated photoconductive detector makes this detector attractive for multi-pixel terahertz imaging systems.

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Research Organization:: Lookin, Inc., Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States); University of California, Los Angeles, CA (United States)

Sponsoring Organization:: Burroughs Wellcome Fund; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0016925; SC0020521

OSTI ID:: 1852356

Journal Information:: APL Photonics, Journal Name: APL Photonics Journal Issue: 8 Vol. 6; ISSN 2378-0967

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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