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Title: Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators

Abstract

Abstract Subwavelength metallic resonators provide a route to achieving strong light–matter coupling by means of tight confinement of resonant electromagnetic fields. Investigation of such resonators however often presents experimental difficulties, particularly at terahertz (THz) frequencies. A single subwavelength resonator interacts weakly with THz beams, making it difficult to probe it using far‐field methods, whereas arrays of resonators exhibit inter‐resonator coupling, which affect the resonator spectral signature and field confinement. Here, traditional far‐field THz spectroscopy is systematically compared with aperture‐type THz near‐field microscopy for investigating complementary THz resonators. While the far‐field method proves impractical for measuring single resonators, the near‐field technique gives high signal‐to‐noise spectral information, only achievable in the far‐field with resonator arrays. At the same time, the near‐field technique allows to analyze single resonators without significant interaction with the near‐field probe. Furthermore, the near‐field technique allows highly confined fields and surface waves to be mapped in space and time. This information gives invaluable insight into spectral response in resonator arrays. This near‐field microscopy and spectroscopy method enables investigations of strong light–matter coupling at THz frequencies in the single‐resonator regime.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1];  [3];  [4];  [4]; ORCiD logo [2];  [2]; ORCiD logo [5]
  1. Electronic and Electrical Engineering University College London London WC1E 7JE UK
  2. Institute of Quantum Electronics ETH Zürich Zürich 8093 Switzerland
  3. Paul Scherrer Institute Villigen 5232 Switzerland
  4. Sandia National Laboratories Albuquerque NM 87185 USA
  5. Electronic and Electrical Engineering University College London London WC1E 7JE UK, Sandia National Laboratories Albuquerque NM 87185 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1603381
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Laser & Photonics Reviews
Additional Journal Information:
Journal Name: Laser & Photonics Reviews Journal Volume: 14 Journal Issue: 4; Journal ID: ISSN 1863-8880
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Hale, Lucy L., Keller, Janine, Siday, Thomas, Hermans, Rodolfo I., Haase, Johannes, Reno, John L., Brener, Igal, Scalari, Giacomo, Faist, Jérôme, and Mitrofanov, Oleg. Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators. Germany: N. p., 2020. Web. doi:10.1002/lpor.201900254.
Hale, Lucy L., Keller, Janine, Siday, Thomas, Hermans, Rodolfo I., Haase, Johannes, Reno, John L., Brener, Igal, Scalari, Giacomo, Faist, Jérôme, & Mitrofanov, Oleg. Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators. Germany. https://doi.org/10.1002/lpor.201900254
Hale, Lucy L., Keller, Janine, Siday, Thomas, Hermans, Rodolfo I., Haase, Johannes, Reno, John L., Brener, Igal, Scalari, Giacomo, Faist, Jérôme, and Mitrofanov, Oleg. Thu . "Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators". Germany. https://doi.org/10.1002/lpor.201900254.
@article{osti_1603381,
title = {Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators},
author = {Hale, Lucy L. and Keller, Janine and Siday, Thomas and Hermans, Rodolfo I. and Haase, Johannes and Reno, John L. and Brener, Igal and Scalari, Giacomo and Faist, Jérôme and Mitrofanov, Oleg},
abstractNote = {Abstract Subwavelength metallic resonators provide a route to achieving strong light–matter coupling by means of tight confinement of resonant electromagnetic fields. Investigation of such resonators however often presents experimental difficulties, particularly at terahertz (THz) frequencies. A single subwavelength resonator interacts weakly with THz beams, making it difficult to probe it using far‐field methods, whereas arrays of resonators exhibit inter‐resonator coupling, which affect the resonator spectral signature and field confinement. Here, traditional far‐field THz spectroscopy is systematically compared with aperture‐type THz near‐field microscopy for investigating complementary THz resonators. While the far‐field method proves impractical for measuring single resonators, the near‐field technique gives high signal‐to‐noise spectral information, only achievable in the far‐field with resonator arrays. At the same time, the near‐field technique allows to analyze single resonators without significant interaction with the near‐field probe. Furthermore, the near‐field technique allows highly confined fields and surface waves to be mapped in space and time. This information gives invaluable insight into spectral response in resonator arrays. This near‐field microscopy and spectroscopy method enables investigations of strong light–matter coupling at THz frequencies in the single‐resonator regime.},
doi = {10.1002/lpor.201900254},
journal = {Laser & Photonics Reviews},
number = 4,
volume = 14,
place = {Germany},
year = {Thu Mar 05 00:00:00 EST 2020},
month = {Thu Mar 05 00:00:00 EST 2020}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1002/lpor.201900254

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Cited by: 7 works
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