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Efficient Terahertz Detection with Perfectly-Absorbing Metasurface

Hale, L; Siday, T; Vabishchevich, PP; Harris, CT; Luk, TS; Reno, JL; Brener, I; (2019) Efficient Terahertz Detection with Perfectly-Absorbing Metasurface. In: Proceedings of the 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE: Paris, France. Green open access

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Abstract

We demonstrate a unique photoconductive design for terahertz (THz) detection based on a perfectly absorbing, all-dielectric metasurface. Our design exploits Mie resonances in electrically connected cubic resonators fabricated in low-temperature grown (LT) GaAs. Experimentally, the detector achieves very high contrast between ON/OFF conductivity states (107) whilst also requiring extremely low optical power for optimal operation (100 muW). We find that the Mie resonances dissipate sufficiently fast and maintain the detection bandwidth up to 3 THz.

Type: Proceedings paper
Title: Efficient Terahertz Detection with Perfectly-Absorbing Metasurface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IRMMW-THz.2019.8874412
Publisher version: https://doi.org/10.1109/IRMMW-THz.2019.8874412
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Optical device fabrication , Optical polarization , Detectors , Optical detectors , Optical switches , Optical pulses , Optical reflection
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/10094140
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