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Efficient photoconductive terahertz detector with all-dielectric optical metasurface

Mitrofanov, O; Siday, T; Thompson, RJ; Luk, TS; Brener, I; Reno, JL; (2018) Efficient photoconductive terahertz detector with all-dielectric optical metasurface. APL Photonics , 3 (5) , Article 051703. 10.1063/1.5011420. Green open access

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Abstract

We designed an optically-thin photoconductive channel as an all-dielectric metasurface comprising an array of low-temperature grown GaAs nanobeams and a sub-surface distributed Bragg reflector. The metasurface exhibited enhanced optical absorption, and it was integrated into a photoconductive THz detector, which showed high efficiency and sensitivity as a result. The detector produced photocurrents over one order of magnitude higher compared to a similar detector with unstructured surface with only 0.5 mW of optical excitation, while exhibiting high dark resistance required for low-noise detection in THz time-domain spectroscopy and imaging. At that level of optical excitation the metasurface detector showed a high signal to noise ratio of 106 . The detector showed saturation above that level.

Type: Article
Title: Efficient photoconductive terahertz detector with all-dielectric optical metasurface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.5011420
Publisher version: http://doi.org/10.1063/1.5011420
Language: English
Additional information: Copyright © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5011420
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10046450
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