Lu, Yuezhen;
Hale, Lucy L;
Zaman, Abdullah M;
Addamane, Sadhvikas J;
Brener, Igal;
Mitrofanov, Oleg;
Degl’Innocenti, Riccardo;
(2023)
Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators.
ACS Photonics
, 10
(8)
pp. 2832-2838.
10.1021/acsphotonics.3c00527.
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Abstract
Metamaterial resonators have become an efficient and versatile platform in the terahertz frequency range, finding applications in integrated optical devices, such as active modulators and detectors, and in fundamental research, e.g., ultrastrong light–matter investigations. Despite their growing use, characterization of modes supported by these subwavelength elements has proven to be challenging and it still relies on indirect observation of the collective far-field transmission/reflection properties of resonator arrays. Here, we present a broadband time-domain spectroscopic investigation of individual metamaterial resonators via a THz aperture scanning near-field microscope (a-SNOM). The time-domain a-SNOM allows the mapping and quantitative analysis of strongly confined modes supported by the resonators. In particular, a cross-polarized configuration presented here allows an investigation of weakly radiative modes. These results hold great potential to advance future metamaterial-based optoelectronic platforms for fundamental research in THz photonics.-
| Type: | Article |
|---|---|
| Title: | Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsphotonics.3c00527 |
| Publisher version: | https://doi.org/10.1021/acsphotonics.3c00527 |
| Language: | English |
| Additional information: | © 2023 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | terahertz, metasurface, near-field spectroscopy, a-SNOM, plasmonics |
| 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-pp.ucl.ac.uk/id/eprint/10175525 |
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