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.
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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 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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