Optical activity in toroidal metamaterials
Optical activity in toroidal metamaterials
Toroidal, doughnut-like structures are frequent in nature, particularly on the molecular level (phages, proteins, carbon nanostructures). However, in spite of numerous predictions of their unusual electromagnetic properties, that include non-reciprocal interactions, invisibility and non-radiative behavior, virtually no experimental evidence is available to confirm this. Toroidal structures can also be chiral and one of the intriguing questions is the relation of toroidal chirality and electromagnetic properties. Here we report the first experimental observation of optical activity in artificial toroidal metamaterials. The studied structures consisting of toroidal wire windings embedded in dielectric, display resonant bands of strong circular dichroism, where the polarization eigenstates of the system are close to circular. By calculating the induced multipole moments for the structure we demonstrate that its electromagnetic response possesses a non-negligible toroidal component and discuss its contribution to the gyrotropy of the structure.
Papasimakis, N.
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Marinov, K.
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Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Boardman, A.D.
ad63ed1d-aef9-401a-bae3-5d08b5ac1680
2008
Papasimakis, N.
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Marinov, K.
9cd1e0a3-6dd8-4acf-b33b-3a47d070fcb3
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Boardman, A.D.
ad63ed1d-aef9-401a-bae3-5d08b5ac1680
Papasimakis, N., Marinov, K., Fedotov, V.A., Zheludev, N.I. and Boardman, A.D.
(2008)
Optical activity in toroidal metamaterials.
QEP-18, Edinburgh, UK.
25 - 28 Aug 2008.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Toroidal, doughnut-like structures are frequent in nature, particularly on the molecular level (phages, proteins, carbon nanostructures). However, in spite of numerous predictions of their unusual electromagnetic properties, that include non-reciprocal interactions, invisibility and non-radiative behavior, virtually no experimental evidence is available to confirm this. Toroidal structures can also be chiral and one of the intriguing questions is the relation of toroidal chirality and electromagnetic properties. Here we report the first experimental observation of optical activity in artificial toroidal metamaterials. The studied structures consisting of toroidal wire windings embedded in dielectric, display resonant bands of strong circular dichroism, where the polarization eigenstates of the system are close to circular. By calculating the induced multipole moments for the structure we demonstrate that its electromagnetic response possesses a non-negligible toroidal component and discuss its contribution to the gyrotropy of the structure.
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Published date: 2008
Venue - Dates:
QEP-18, Edinburgh, UK, 2008-08-25 - 2008-08-28
Identifiers
Local EPrints ID: 63362
URI: http://eprints.soton.ac.uk/id/eprint/63362
PURE UUID: 4e7ec553-d7cd-42ce-835f-24ece1c78d8a
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Date deposited: 20 Oct 2008
Last modified: 18 Jan 2022 02:39
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Contributors
Author:
N. Papasimakis
Author:
K. Marinov
Author:
V.A. Fedotov
Author:
N.I. Zheludev
Author:
A.D. Boardman
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