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Optical activity in toroidal metamaterials

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-recipocal 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.
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.
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. 26 - 29 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-recipocal 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, 2008-08-26 - 2008-08-29

Identifiers

Local EPrints ID: 63362
URI: https://eprints.soton.ac.uk/id/eprint/63362
PURE UUID: 4e7ec553-d7cd-42ce-835f-24ece1c78d8a
ORCID for N. Papasimakis: ORCID iD orcid.org/0000-0002-6347-6466
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 20 Oct 2008
Last modified: 14 Mar 2019 01:53

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Contributors

Author: N. Papasimakis ORCID iD
Author: K. Marinov
Author: V.A. Fedotov
Author: N.I. Zheludev ORCID iD
Author: A.D. Boardman

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