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Title: Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface

Abstract

Terahertz (THz) photoconductive devices are utilized for generation, detection, and modulation of THz waves, and they rely on the ability to switch electrical conductivity on a subpicosecond time scale using optical pulses. Yet, fast and efficient conductivity switching with high contrast has been a challenge, because the majority of photoexcited charge carriers in the switch do not contribute to the photocurrent due to fast recombination. Here, we improve efficiency of electrical conductivity switching using a network of electrically connected nanoscale GaAs resonators, which form a perfectly absorbing photoconductive metasurface. We achieve perfect absorption without incorporating metallic elements, by breaking the symmetry of cubic Mie resonators. As a result, the metasurface can be switched between conductive and resistive states with extremely high contrast using an unprecedentedly low level of optical excitation. We integrate this metasurface with a THz antenna to produce an efficient photoconductive THz detector. The perfectly absorbing photoconductive metasurface opens paths for developing a wide range of efficient optoelectronic devices, where required optical and electronic properties are achieved through nanostructuring the resonator network.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [2];  [2];  [2]; ORCiD logo [2];  [3]
  1. Univ. College London (UCL), London (United Kingdom)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Univ. College London (UCL), London (United Kingdom); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1515200
Report Number(s):
[SAND-2019-4733J]
[Journal ID: ISSN 1530-6984; 675053]
Grant/Contract Number:  
[AC04-94AL85000]
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
[ Journal Volume: 19; Journal Issue: 5]; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Terahertz; perfect absorption; metasurface; photoconductive detector

Citation Formats

Siday, Thomas, Vabishchevich, Polina P., Hale, Lucy, Harris, Charles Thomas, Luk, Ting Shan, Reno, John L., Brener, Igal, and Mitrofanov, Oleg. Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.8b05118.
Siday, Thomas, Vabishchevich, Polina P., Hale, Lucy, Harris, Charles Thomas, Luk, Ting Shan, Reno, John L., Brener, Igal, & Mitrofanov, Oleg. Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface. United States. doi:10.1021/acs.nanolett.8b05118.
Siday, Thomas, Vabishchevich, Polina P., Hale, Lucy, Harris, Charles Thomas, Luk, Ting Shan, Reno, John L., Brener, Igal, and Mitrofanov, Oleg. Thu . "Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface". United States. doi:10.1021/acs.nanolett.8b05118.
@article{osti_1515200,
title = {Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface},
author = {Siday, Thomas and Vabishchevich, Polina P. and Hale, Lucy and Harris, Charles Thomas and Luk, Ting Shan and Reno, John L. and Brener, Igal and Mitrofanov, Oleg},
abstractNote = {Terahertz (THz) photoconductive devices are utilized for generation, detection, and modulation of THz waves, and they rely on the ability to switch electrical conductivity on a subpicosecond time scale using optical pulses. Yet, fast and efficient conductivity switching with high contrast has been a challenge, because the majority of photoexcited charge carriers in the switch do not contribute to the photocurrent due to fast recombination. Here, we improve efficiency of electrical conductivity switching using a network of electrically connected nanoscale GaAs resonators, which form a perfectly absorbing photoconductive metasurface. We achieve perfect absorption without incorporating metallic elements, by breaking the symmetry of cubic Mie resonators. As a result, the metasurface can be switched between conductive and resistive states with extremely high contrast using an unprecedentedly low level of optical excitation. We integrate this metasurface with a THz antenna to produce an efficient photoconductive THz detector. The perfectly absorbing photoconductive metasurface opens paths for developing a wide range of efficient optoelectronic devices, where required optical and electronic properties are achieved through nanostructuring the resonator network.},
doi = {10.1021/acs.nanolett.8b05118},
journal = {Nano Letters},
number = [5],
volume = [19],
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 4, 2020
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Cited by: 1 work
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