期刊
NANO LETTERS
卷 12, 期 2, 页码 977-983出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl204055r
关键词
Chiral; plasmonic; metamaterials; optics; nanostructures
类别
资金
- EPSRC
- MRC
- National Science Foundation
- Iraqi Government
- EPSRC [EP/F026757/1] Funding Source: UKRI
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0933415] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/F026757/1] Funding Source: researchfish
We report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, far-field mechanism is utilized which enables chirality to be conveyed from a surrounding chiral molecular material to a plasmonic resonance of an achiral metallic nanostructure. Our observations break a currently held preconception that optical properties of plasmonic particles can most effectively be manipulated by molecular materials through near-field effects. We show that far-field electromagnetic coupling between a localized plasmon of a nonchiral nanostructure and a surrounding chiral molecular layer can induce plasmonic chirality much more effectively (by a factor of 10(3)) than previously reported near-field phenomena. We gain insight into the mechanism by comparing our experimental results to a simple electromagnetic model which incorporates a plasmonic object coupled with a chiral molecular medium. Our work offers a new direction for the creation of hybrid molecular plasmonic nanomaterials that display significant chiroptical properties in the visible spectral region.
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