Journal
NANO LETTERS
Volume 14, Issue 2, Pages 1021-1025Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl404572u
Keywords
Metamaterials; nanophotonics; chirality; circular dichroism; optical activity
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Funding
- Georgia Institute of Technology
- National Science Foundation (NSF) [DGE-1148903]
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We demonstrate enormously strong chiral effects from a photonic metamaterial consisting of an array of dual-layer twisted-arcs with a total thickness of similar to lambda/6. Experimental results reveal a circular dichroism of similar to 0.35 in the absolute value and a maximum polarization rotation of similar to 305 degrees/lambda in a near-infrared wavelength region. A transmission of greater than 50% is achieved at the frequency where the polarization rotation peaks. Retrieved parameters from measured quantities further indicate an actual optical activity of 76 degrees per lambda and a difference of 0.42 in the indices of refraction for the two circularly polarized waves of opposite handedness.
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