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:
-
[1];
[2];
[2];
- Univ. College London (UCL), London (United Kingdom)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- 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)
- 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. https://doi.org/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. https://doi.org/10.1021/acs.nanolett.8b05118. https://www.osti.gov/servlets/purl/1515200.
@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 = {Thu Apr 04 00:00:00 EDT 2019},
month = {Thu Apr 04 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
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