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Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy

Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy
Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy
Dichroic polarizers and waveplates exploiting anisotropic materials have vast applications in displays and numerous optical components, such as filters, beamsplitters and isolators. Artificial anisotropic media were recently suggested for the realization of negative refraction, cloaking, hyperlenses, and controlling luminescence. However, extending these applications into the terahertz domain is hampered by a lack of natural anisotropic media, while artificial metamaterials offer a strong engineered anisotropic response. Here we demonstrate a terahertz metamaterial with anisotropy tunable from positive to negative values. It is based on the Maltese-cross pattern, where anisotropy is induced by breaking the four-fold symmetry of the cross by displacing one of its beams. The symmetry breaking permits the excitation of a Fano mode active for one of the polarization eigenstates controlled by actuators using microelectromechanical systems. The metamaterial offers new opportunities for the development of terahertz variable waveplates, tunable filters and polarimetry.
1-6
Zhu, W.M.
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Liu, A.Q.
b1a9be75-8e2d-4e6c-8fcf-f532a7a83d71
Bourouina, T.
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Tsai, D.P.
ac188460-c076-41ee-bce4-7aa873f757e3
Teng, J.H.
ee2f6ca3-8daf-420b-a835-030b2bd3a875
Zhang, X.H.
9331bd91-eb07-4b46-aa37-5e5348d9505c
Lo, G.Q.
19836cca-596c-4575-92df-b63c7169189c
Kwong, D.L.
9c0450a2-945d-4e3f-b7c4-94e0d18f9c8a
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Zhu, W.M.
e170dfcf-121f-48ff-8a3a-211f4521c051
Liu, A.Q.
b1a9be75-8e2d-4e6c-8fcf-f532a7a83d71
Bourouina, T.
2aae2e1b-41a9-4380-84ed-99d661c49d73
Tsai, D.P.
ac188460-c076-41ee-bce4-7aa873f757e3
Teng, J.H.
ee2f6ca3-8daf-420b-a835-030b2bd3a875
Zhang, X.H.
9331bd91-eb07-4b46-aa37-5e5348d9505c
Lo, G.Q.
19836cca-596c-4575-92df-b63c7169189c
Kwong, D.L.
9c0450a2-945d-4e3f-b7c4-94e0d18f9c8a
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Zhu, W.M., Liu, A.Q., Bourouina, T., Tsai, D.P., Teng, J.H., Zhang, X.H., Lo, G.Q., Kwong, D.L. and Zheludev, N.I. (2012) Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy. Nature Communications, 3, 1-6. (doi:10.1038/ncomms2285).

Record type: Article

Abstract

Dichroic polarizers and waveplates exploiting anisotropic materials have vast applications in displays and numerous optical components, such as filters, beamsplitters and isolators. Artificial anisotropic media were recently suggested for the realization of negative refraction, cloaking, hyperlenses, and controlling luminescence. However, extending these applications into the terahertz domain is hampered by a lack of natural anisotropic media, while artificial metamaterials offer a strong engineered anisotropic response. Here we demonstrate a terahertz metamaterial with anisotropy tunable from positive to negative values. It is based on the Maltese-cross pattern, where anisotropy is induced by breaking the four-fold symmetry of the cross by displacing one of its beams. The symmetry breaking permits the excitation of a Fano mode active for one of the polarization eigenstates controlled by actuators using microelectromechanical systems. The metamaterial offers new opportunities for the development of terahertz variable waveplates, tunable filters and polarimetry.

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Published date: 11 December 2012
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 369629
URI: https://eprints.soton.ac.uk/id/eprint/369629
PURE UUID: b9afd4c9-48e3-448f-ab4d-8d836f5a148c
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

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Date deposited: 08 Oct 2014 12:21
Last modified: 03 Dec 2019 02:03

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Contributors

Author: W.M. Zhu
Author: A.Q. Liu
Author: T. Bourouina
Author: D.P. Tsai
Author: J.H. Teng
Author: X.H. Zhang
Author: G.Q. Lo
Author: D.L. Kwong
Author: N.I. Zheludev ORCID iD

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