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Optical activity Enhanced by strong inter-molecular coupling in planar chiral metamaterials

Kim, Teun-Teun, Oh, Sang Soon ORCID:, Park, Hyun-Sung, Zhao, Rongkuo, Kim, Seong-Han, Choi, Wonjune, Min, Bumki and Hess, Ortwin 2014. Optical activity Enhanced by strong inter-molecular coupling in planar chiral metamaterials. Scientific Reports 4 (1) , 5864. 10.1038/srep05864

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The polarization of light can be rotated in materials with an absence of molecular or structural mirror symmetry. While this rotating ability is normally rather weak in naturally occurring chiral materials, artificial chiral metamaterials have demonstrated extraordinary rotational ability by engineering intra-molecular couplings. However, while in general, chiral metamaterials can exhibit strong rotatory power at or around resonances, they convert linearly polarized waves into elliptically polarized ones. Here, we demonstrate that strong inter-molecular coupling through a small gap between adjacent chiral metamolecules can lead to a broadband enhanced rotating ability with pure rotation of linearly polarized electromagnetic waves. Strong inter-molecular coupling leads to nearly identical behaviour in magnitude, but engenders substantial difference in phase between transmitted left and right-handed waves.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 10 January 2018
Date of Acceptance: 27 June 2014
Last Modified: 07 May 2023 09:20

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