期刊
OPTICS EXPRESS
卷 24, 期 3, 页码 2242-2252出版社
Optica Publishing Group
DOI: 10.1364/OE.24.002242
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资金
- Ministerio de Economia y Competitividad [FIS2012-38244-C02-02, CTQ2013-47401-C2-1-P]
- European Commission [PIIF-GA-2012-330513]
- US National Science Foundation [DMR-1105000]
- US National Science Foundation Predoctoral Fellowship [DGE-12342536]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1105000] Funding Source: National Science Foundation
The optical activity of fabricated metallic nanostructures is investigated by complete polarimetry. While lattices decorated with nanoscale gammadia etched in thin metallic films have been described as two dimensional, planar nanostructures, they are better described as quasi-planar structures with some three dimensional character. We find that the optical activity of these structures arises not only from the dissymmetric backing by a substrate but, more importantly, from the selective rounding of the nanostructure edges. A true chiroptical response in the far-field is only allowed when the gammadia contain these non-planar features. This is demonstrated by polarimetric measurements in conjunction with electrodynamical simulations based on the discrete dipole approximation that consider non-ideal gammadia. It is also shown that subtle planar dis-symmetries in gammadia are sufficient to generate asymmetric transmission of circular polarized light. (C) 2016 Optical Society of America
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