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Electrogyration in metamaterials: chirality and polarization rotatory power that depend on applied electric field

Electrogyration in metamaterials: chirality and polarization rotatory power that depend on applied electric field
Electrogyration in metamaterials: chirality and polarization rotatory power that depend on applied electric field
One of the most fascinating properties of chiral molecules is their ability to rotate the polarization of light. Since Faraday’s experiments in 1845 it has been known that non-reciprocal polarization rotatory power can be induced by a magnetic field. But can reciprocal polarization rotation in chiral molecules be influenced by an electric field? In the 1960s Aizu and Zheludev introduced the phenomenon of electrogyration. While the linear (Pockels) and quadratic (Kerr) electro-optical effects describe how an external electric field changes linear birefringence and dichroism, electrogyration describes how a field changes the circular birefringence and dichroism of a medium. Electrogyration has been observed in dielectrics, semiconductors and ferroelectrics, but the effect is small. This work demonstrates a nanostructured photonic metamaterial that exhibits quadratic electrogyration – proportional to the square of the applied electric field – six orders of magnitude stronger than in any natural medium. Giant quadratic electrogyration emerges as electrostatic forces acting against forces of elasticity change the chiral configuration of the metamaterial’s nanoscale building blocks and consequently its polarization rotatory power. This observation of giant electrogyration alters the perception of the effect from that of an esoteric phenomenon into a functional part of the electro-optic toolkit with application potential.
NEMS, circular birefringence, circular dichroism, electrogyration, electrooptics, metamaterial, nanomembrane metamaterial, optical activity
2195-1071
Zhang, Qiang
7e3b7a43-bfc5-4d7a-8f4b-4e930d6ba356
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Pi, Hailong
32718fa6-ab51-4d28-b147-ce16a3235ac7
Li, Junqing
43e92e31-aaa1-4d2c-ac51-c86f74b3686a
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Zhang, Qiang
7e3b7a43-bfc5-4d7a-8f4b-4e930d6ba356
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Pi, Hailong
32718fa6-ab51-4d28-b147-ce16a3235ac7
Li, Junqing
43e92e31-aaa1-4d2c-ac51-c86f74b3686a
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6

Zhang, Qiang, Plum, Eric, Ou, Jun-Yu, Pi, Hailong, Li, Junqing, MacDonald, Kevin F. and Zheludev, Nikolai (2020) Electrogyration in metamaterials: chirality and polarization rotatory power that depend on applied electric field. Advanced Optical Materials, 9 (4), [2001826]. (doi:10.1002/adom.202001826).

Record type: Article

Abstract

One of the most fascinating properties of chiral molecules is their ability to rotate the polarization of light. Since Faraday’s experiments in 1845 it has been known that non-reciprocal polarization rotatory power can be induced by a magnetic field. But can reciprocal polarization rotation in chiral molecules be influenced by an electric field? In the 1960s Aizu and Zheludev introduced the phenomenon of electrogyration. While the linear (Pockels) and quadratic (Kerr) electro-optical effects describe how an external electric field changes linear birefringence and dichroism, electrogyration describes how a field changes the circular birefringence and dichroism of a medium. Electrogyration has been observed in dielectrics, semiconductors and ferroelectrics, but the effect is small. This work demonstrates a nanostructured photonic metamaterial that exhibits quadratic electrogyration – proportional to the square of the applied electric field – six orders of magnitude stronger than in any natural medium. Giant quadratic electrogyration emerges as electrostatic forces acting against forces of elasticity change the chiral configuration of the metamaterial’s nanoscale building blocks and consequently its polarization rotatory power. This observation of giant electrogyration alters the perception of the effect from that of an esoteric phenomenon into a functional part of the electro-optic toolkit with application potential.

Text
Electrogyration in metamaterials: Chirality and polarization rotatory power that depend on applied electric field - Accepted Manuscript
Restricted to Repository staff only until 16 December 2021.
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More information

Accepted/In Press date: 25 November 2020
e-pub ahead of print date: 16 December 2020
Keywords: NEMS, circular birefringence, circular dichroism, electrogyration, electrooptics, metamaterial, nanomembrane metamaterial, optical activity

Identifiers

Local EPrints ID: 445353
URI: http://eprints.soton.ac.uk/id/eprint/445353
ISSN: 2195-1071
PURE UUID: 73b5c09c-d4a9-464f-8528-d12e2cc34403
ORCID for Eric Plum: ORCID iD orcid.org/0000-0002-1552-1840
ORCID for Jun-Yu Ou: ORCID iD orcid.org/0000-0001-8028-6130
ORCID for Kevin F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for Nikolai Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 03 Dec 2020 17:33
Last modified: 26 Nov 2021 02:57

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Contributors

Author: Qiang Zhang
Author: Eric Plum ORCID iD
Author: Jun-Yu Ou ORCID iD
Author: Hailong Pi
Author: Junqing Li

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