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Giant gyrotropy in bi-layered chiral structures

Giant gyrotropy in bi-layered chiral structures
Giant gyrotropy in bi-layered chiral structures
We show that a layered structure consisting of two identical planar metal patterns can show exceptionally strong resonant gyrotropy if one pattern is twisted with respect to the other thus creating a 3D-chiral object. This effect is analogous to the gyrotropy of bulk media comprised of chiral molecules was and was first theoretically analyzed in [Appl. Phys. Lett. 78, 498 (2001)]. Using helicoidally arranged planar metal rosettes of 4-fold rotational symmetry we achieved enantiomerically sensitive polarization plane rotation (optical activity) of about 30 degrees and circular dichroism in the microwave part of the spectrum. The ability to create gyrotropic structures utilizing planar technology provides opportunities for manufacturing artificial gyrotropic materials, which can be use to manipulate the polarization state of radiation in the optical and microwave ranges. The range of possible applications of such structures includes computer displays and various opto-electronic devices. Its exceptionally strong gyrotropy can also be used for developing so-called negative refractive-index media wherein simultaneous electric and magnetic resonances at optical frequencies are needed to achieve negative refraction. Using appropriately scaled subwavelength nano-structures we expect to confirm this strong gyrotropy in the optical part of the spectrum.
Rogacheva, A.V.
07e3c6ce-4e4d-4660-87fd-b04e7061b3ee
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Schwanecke, A.S.
ee362335-ee3e-4c26-8035-5c397e10b274
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Rogacheva, A.V.
07e3c6ce-4e4d-4660-87fd-b04e7061b3ee
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Schwanecke, A.S.
ee362335-ee3e-4c26-8035-5c397e10b274
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Rogacheva, A.V., Fedotov, V.A., Schwanecke, A.S. and Zheludev, N.I. (2006) Giant gyrotropy in bi-layered chiral structures. QEP-17 at Photon06, Manchester, UK. 03 - 06 Sep 2006.

Record type: Conference or Workshop Item (Paper)

Abstract

We show that a layered structure consisting of two identical planar metal patterns can show exceptionally strong resonant gyrotropy if one pattern is twisted with respect to the other thus creating a 3D-chiral object. This effect is analogous to the gyrotropy of bulk media comprised of chiral molecules was and was first theoretically analyzed in [Appl. Phys. Lett. 78, 498 (2001)]. Using helicoidally arranged planar metal rosettes of 4-fold rotational symmetry we achieved enantiomerically sensitive polarization plane rotation (optical activity) of about 30 degrees and circular dichroism in the microwave part of the spectrum. The ability to create gyrotropic structures utilizing planar technology provides opportunities for manufacturing artificial gyrotropic materials, which can be use to manipulate the polarization state of radiation in the optical and microwave ranges. The range of possible applications of such structures includes computer displays and various opto-electronic devices. Its exceptionally strong gyrotropy can also be used for developing so-called negative refractive-index media wherein simultaneous electric and magnetic resonances at optical frequencies are needed to achieve negative refraction. Using appropriately scaled subwavelength nano-structures we expect to confirm this strong gyrotropy in the optical part of the spectrum.

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More information

Published date: September 2006
Venue - Dates: QEP-17 at Photon06, Manchester, UK, 2006-09-03 - 2006-09-06

Identifiers

Local EPrints ID: 57756
URI: http://eprints.soton.ac.uk/id/eprint/57756
PURE UUID: 4002a51a-d02d-47c8-bce1-ec5a13a20dd0
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 11 Aug 2008
Last modified: 12 Dec 2021 02:45

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Contributors

Author: A.V. Rogacheva
Author: V.A. Fedotov
Author: A.S. Schwanecke
Author: N.I. Zheludev ORCID iD

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