Induced Chirality through Electromagnetic Coupling between Chiral Molecular Layers and Plasmonic Nanostructures

被引:211
作者
Abdulrahman, Nadia A. [2 ]
Fan, Z. [3 ]
Tonooka, Taishi [2 ]
Kelly, Sharon M. [4 ]
Gadegaard, Nikolaj [5 ]
Hendry, Euan [1 ]
Govorov, Alexander O. [3 ]
Kadodwala, Malcolm [2 ]
机构
[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[2] Univ Glasgow, Sch Chem, Glasgow G12 8QQ, Lanark, Scotland
[3] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA
[4] Univ Glasgow, Coll Med Vet & Life Sci, Inst Mol Cell & Syst Biol, Glasgow G12 8QQ, Lanark, Scotland
[5] Univ Glasgow, Sch Engn, Div Biomed Engn, Glasgow G12 8LT, Lanark, Scotland
基金
美国国家科学基金会; 英国工程与自然科学研究理事会;
关键词
Chiral; plasmonic; metamaterials; optics; nanostructures; CIRCULAR-DICHROISM;
D O I
10.1021/nl204055r
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:977 / 983
页数:7
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