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Mechanically tunable terahertz metamaterial perfect absorber

Mechanically tunable terahertz metamaterial perfect absorber
Mechanically tunable terahertz metamaterial perfect absorber
The development of a wide range of technologies based on terahertz (THz) electromagnetic radiation drives a strong demand for flexible optical elements. Metasurfaces based on metallic resonators offer a versatile toolkit that permits easy tuning over a wide spectral range by the geometric design. Herein, a mechanically tuned metasurface perfect absorber comprised of split-ring resonators in combination with a metallic mirror in a microcavity arrangement, is demonstrated. By mechanically tuning the length of the microcavity in the range of 10 μm and above, precise control over the perfect absorption condition is exhibited. A maximum recorded extinction of 45.8 dB is obtained at the perfect absorption condition, corresponding to a suppression of the reflected radiation by almost five orders of magnitude. Experiments are performed in a reflection arrangement using a terahertz time-domain spectrometer. Simulations of the experimental arrangement show that near-field effects are weak and the enhancement of metamaterial perfect absorption is in agreement with purely interferometric effects.
2699-9293
2100136
Piper, Lewis K.
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Singh, H. Johnson
02620e1e-88b7-4f50-a281-f88e6da55916
Woods, Jonathan R. C.
469cd675-1074-4b44-a0d4-b72a4915fa36
Sun, Kai
b7c648a3-7be8-4613-9d4d-1bf937fb487b
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Apostolopoulos, Vasilis
8a898740-4c71-4040-a577-9b9d70530b4d
Piper, Lewis K.
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Singh, H. Johnson
02620e1e-88b7-4f50-a281-f88e6da55916
Woods, Jonathan R. C.
469cd675-1074-4b44-a0d4-b72a4915fa36
Sun, Kai
b7c648a3-7be8-4613-9d4d-1bf937fb487b
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Apostolopoulos, Vasilis
8a898740-4c71-4040-a577-9b9d70530b4d

Piper, Lewis K., Singh, H. Johnson, Woods, Jonathan R. C., Sun, Kai, Muskens, Otto L. and Apostolopoulos, Vasilis (2021) Mechanically tunable terahertz metamaterial perfect absorber. Advanced Photonics Research, 2 (12), 2100136. (doi:10.1002/adpr.202100136).

Record type: Article

Abstract

The development of a wide range of technologies based on terahertz (THz) electromagnetic radiation drives a strong demand for flexible optical elements. Metasurfaces based on metallic resonators offer a versatile toolkit that permits easy tuning over a wide spectral range by the geometric design. Herein, a mechanically tuned metasurface perfect absorber comprised of split-ring resonators in combination with a metallic mirror in a microcavity arrangement, is demonstrated. By mechanically tuning the length of the microcavity in the range of 10 μm and above, precise control over the perfect absorption condition is exhibited. A maximum recorded extinction of 45.8 dB is obtained at the perfect absorption condition, corresponding to a suppression of the reflected radiation by almost five orders of magnitude. Experiments are performed in a reflection arrangement using a terahertz time-domain spectrometer. Simulations of the experimental arrangement show that near-field effects are weak and the enhancement of metamaterial perfect absorption is in agreement with purely interferometric effects.

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Advanced Photonics Research - 2021 - Piper - Mechanically Tunable Terahertz Metamaterial Perfect Absorber - Version of Record
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Published date: 1 December 2021

Identifiers

Local EPrints ID: 454357
URI: http://eprints.soton.ac.uk/id/eprint/454357
ISSN: 2699-9293
PURE UUID: 0c8ab778-5a78-45d2-9ea8-48be78200f4a
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504
ORCID for Vasilis Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

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Date deposited: 08 Feb 2022 17:33
Last modified: 09 Feb 2022 02:39

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Contributors

Author: Lewis K. Piper
Author: Jonathan R. C. Woods
Author: Kai Sun
Author: Otto L. Muskens ORCID iD

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