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Terahertz detectors based on all-dielectric photoconductive metasurfaces

Mitrofanov, O; Siday, T; Vabishchevich, PP; Hale, L; Harris, CT; Luk, TS; Reno, JL; (2019) Terahertz detectors based on all-dielectric photoconductive metasurfaces. In: Proceedings Volume 11124, Terahertz Emitters, Receivers, and Applications X, 1112410 (2019). SPIE: San Diego, CA, USA. Green open access

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Abstract

Performance of terahertz (THz) photoconductive devices, including detectors and emitters, has been improved recently by means of plasmonic nanoantennae and gratings. However, plasmonic nanostructures introduce Ohmic losses, which limit gains in device performance. In this presentation, we discuss an alternative approach, which eliminates the problem of Ohmic losses. We use all-dielectric photoconductive metasurfaces as the active region in THz switches to improve their efficiency. In particular, we discuss two approaches to realize perfect optical absorption in a thin photoconductive layer without introducing metallic elements. In addition to providing perfect optical absorption, the photoconductive channel based on all-dielectric metasurface allows us to engineer desired electrical properties, specifically, fast and efficient conductivity switching with very high contrast. This approach thus promises a new generation of sensitive and efficient THz photoconductive detectors. Here we demonstrate and discuss performance of two practical THz photoconductive detectors with integrated all-dielectric metasurfaces.

Type: Proceedings paper
Title: Terahertz detectors based on all-dielectric photoconductive metasurfaces
Event: SPIE Optical Engineering + Applications, 11 August 2019 - 15 August 2019
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2529393
Publisher version: https://doi.org/10.1117/12.2529393
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10093491
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