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Active liquid crystal-loaded metasurfaces for THz and IR applications

Active liquid crystal-loaded metasurfaces for THz and IR applications
Active liquid crystal-loaded metasurfaces for THz and IR applications
One of the important steps towards practical application of the metamaterials is the implementation of an efficient active control over their optical response. This can be achieved by hybridising the fabric of these man-made photonic materials with naturally available functional media. Among such media liquid crystals possess arguably the largest and most broadband optical nonlinearity, while their properties can be readily controlled by light, temperature, electric and magnetic fields. Here we experimentally demonstrate active planar metamaterials (or metasurfaces) - artificially structured thin metal films loaded with liquid crystals, where the resonant response can be dynamically controlled both in terms of its magnitude and wavelength using externally applied electric field. The electric control has been implemented for THz and near-IR metasurfaces by engaging for the first time the in-plane switching of liquid crystals at micro- and nano-scale. As a result, it became possible to realise an optically thin large-area modulator of THz radiation with the absolute change in intensity and phase of correspondingly 20 % and 40 deg, achieved for a single pass transmission at only 20 V. For the near-IR metasurface we were able to bring the control voltage below 2 V demonstrating spectral tuning of its response by as larger as 100 nm.
Buchnev, O.
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Wallauer, J.
ca1290d9-09cf-4ad4-bc83-6e8af5758737
Walther, M.
79136385-d7a0-4d2e-923e-45cb852b7938
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Buchnev, O.
60cdb0d2-3388-47be-a066-61b3b396f69d
Wallauer, J.
ca1290d9-09cf-4ad4-bc83-6e8af5758737
Walther, M.
79136385-d7a0-4d2e-923e-45cb852b7938
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25

Buchnev, O., Wallauer, J., Walther, M., Podoliak, Nina, Kaczmarek, M., Zheludev, N.I. and Fedotov, V.A. (2014) Active liquid crystal-loaded metasurfaces for THz and IR applications. SPIE Photonics Europe '14, Brussels, Belgium. 14 - 17 Apr 2014.

Record type: Conference or Workshop Item (Paper)

Abstract

One of the important steps towards practical application of the metamaterials is the implementation of an efficient active control over their optical response. This can be achieved by hybridising the fabric of these man-made photonic materials with naturally available functional media. Among such media liquid crystals possess arguably the largest and most broadband optical nonlinearity, while their properties can be readily controlled by light, temperature, electric and magnetic fields. Here we experimentally demonstrate active planar metamaterials (or metasurfaces) - artificially structured thin metal films loaded with liquid crystals, where the resonant response can be dynamically controlled both in terms of its magnitude and wavelength using externally applied electric field. The electric control has been implemented for THz and near-IR metasurfaces by engaging for the first time the in-plane switching of liquid crystals at micro- and nano-scale. As a result, it became possible to realise an optically thin large-area modulator of THz radiation with the absolute change in intensity and phase of correspondingly 20 % and 40 deg, achieved for a single pass transmission at only 20 V. For the near-IR metasurface we were able to bring the control voltage below 2 V demonstrating spectral tuning of its response by as larger as 100 nm.

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More information

e-pub ahead of print date: 2014
Venue - Dates: SPIE Photonics Europe '14, Brussels, Belgium, 2014-04-14 - 2014-04-17
Organisations: Optoelectronics Research Centre, Physics & Astronomy, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 375901
URI: https://eprints.soton.ac.uk/id/eprint/375901
PURE UUID: 108b2f77-86b1-42f2-845d-0c3dc1961348
ORCID for Nina Podoliak: ORCID iD orcid.org/0000-0002-3146-0355
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 21 Apr 2015 14:20
Last modified: 21 Mar 2019 01:37

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Contributors

Author: O. Buchnev
Author: J. Wallauer
Author: M. Walther
Author: Nina Podoliak ORCID iD
Author: M. Kaczmarek
Author: N.I. Zheludev ORCID iD
Author: V.A. Fedotov

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