Journal
LASER & PHOTONICS REVIEWS
Volume 14, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201900254
Keywords
aperture probes; complementary resonators; inter-resonator coupling; metasurfaces; near-field microscopy; surface waves; terahertz spectroscopy
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Funding
- EPSRC [EP/P021859/1] Funding Source: UKRI
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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.
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