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Noninvasive Near-Field Spectroscopy of Single Subwavelength Complementary Resonators

Hale, LL; Keller, J; Siday, T; Hermans, RI; Haase, J; Reno, JL; Brener, I; ... Mitrofanov, O; + view all (2020) Noninvasive Near-Field Spectroscopy of Single Subwavelength Complementary Resonators. Laser and Photonics Reviews , 14 (4) , Article 1900254. 10.1002/lpor.201900254. Green open access

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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.

Type: Article
Title: Noninvasive Near-Field Spectroscopy of Single Subwavelength Complementary Resonators
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/lpor.201900254
Publisher version: https://doi.org/10.1002/lpor.201900254
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Physical Sciences, Optics, Physics, Applied, Physics, Condensed Matter, Physics, aperture probes, complementary resonators, inter-resonator coupling, metasurfaces, near-field microscopy, surface waves, terahertz spectroscopy, TERAHERTZ, WAVES, ARRAYS, MODES
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/10098136
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