Optical Activity Enhanced by Strong Inter-molecular Coupling in Planar Chiral Metamaterials

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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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2014-09
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.4

ISSN
2045-2322
DOI
10.1038/srep05864
URI
http://hdl.handle.net/10203/194155
Appears in Collection
ME-Journal Papers(저널논문)
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