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Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials

Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials
Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials

Babinet complementary patterns of a spectrally tunable metamaterial incorporating a nematic liquid crystal is normally assumed to exhibit the same tuning range. Here we show that for a hybrid, liquid crystal-loaded metamaterial, the sensitivity of its terahertz resonances to the variations of the refractive index differs substantially for the two complementary patterns. This is due to a mismatch between the alignment of the liquid crystal and the direction of the local electric field induced in the metamaterial patterns. Furthermore, and more intriguingly, our experimental data indicate that it is possible to shift the resonance of the positive metamaterial pattern beyond the limit imposed by the alignment mismatch. Our analysis suggests that the observed anomalous frequency shift results from the orientational optical nonlinearity of a nematic liquid crystal.

THz, metamaterials, nematic liquid crystals, optical nonlinearity
2341-2348
Fedotov, Vasily
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Perivolari, Eleni
a65ec857-cf22-497d-bdb4-66fb449751d3
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Parka, Janusz
be03bdd5-2ef2-4fd4-9335-c4567bae9d50
Fedotov, Vasily
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Perivolari, Eleni
a65ec857-cf22-497d-bdb4-66fb449751d3
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Parka, Janusz
be03bdd5-2ef2-4fd4-9335-c4567bae9d50

Fedotov, Vasily, Perivolari, Eleni, Apostolopoulos, Vasileios, Kaczmarek, Malgosia and Parka, Janusz (2022) Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials. Nanophotonics, 11 (10), 2341-2348. (doi:10.1515/nanoph-2022-0036).

Record type: Article

Abstract

Babinet complementary patterns of a spectrally tunable metamaterial incorporating a nematic liquid crystal is normally assumed to exhibit the same tuning range. Here we show that for a hybrid, liquid crystal-loaded metamaterial, the sensitivity of its terahertz resonances to the variations of the refractive index differs substantially for the two complementary patterns. This is due to a mismatch between the alignment of the liquid crystal and the direction of the local electric field induced in the metamaterial patterns. Furthermore, and more intriguingly, our experimental data indicate that it is possible to shift the resonance of the positive metamaterial pattern beyond the limit imposed by the alignment mismatch. Our analysis suggests that the observed anomalous frequency shift results from the orientational optical nonlinearity of a nematic liquid crystal.

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Accepted/In Press date: 23 March 2022
e-pub ahead of print date: 21 April 2022
Published date: 1 May 2022
Additional Information: Funding Information: Research funding: The authors acknowledge the financial support of the UK Engineering and Physical Sciences Research Council through grant EP/R024421/1 and the Military University of Technology of Warsaw grant for “New crystalline and composite materials for optics and photonics”, UGB 22-793/2022, fund for the year 2020. Publisher Copyright: © 2022 Eleni Perivolari et al., published by De Gruyter, Berlin/Boston.
Keywords: THz, metamaterials, nematic liquid crystals, optical nonlinearity

Identifiers

Local EPrints ID: 456589
URI: http://eprints.soton.ac.uk/id/eprint/456589
PURE UUID: 0d5ea76c-62d4-4bf5-a8f8-fe50324c22fa
ORCID for Vasileios Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

Catalogue record

Date deposited: 05 May 2022 16:44
Last modified: 17 Nov 2022 02:38

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Contributors

Author: Vasily Fedotov
Author: Eleni Perivolari
Author: Janusz Parka

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