Superchiral electromagnetic fields created by surface plasmons in nonchiral metallic nanostructures

被引：129

作者：

Davis, T. J. ^{[1
,2
]}

Hendry, E. ^{[3
]}

机构：

[1] CSIRO Mat Sci & Engn, Clayton, Vic 3168, Australia

[2] Melbourne Ctr Nanofabricat, Clayton, Vic 3168, Australia

[3] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

CHIRAL MOLECULES; RESONANCES; MODEL;

D O I：

10.1103/PhysRevB.87.085405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show theoretically that localized surface plasmons can generate optical fields with a chirality exceeding that of circularly polarized light by a factor of 50. This superchiral optical field can be formed from linearly polarized light incident on nonchiral metal structures. We identify three mechanisms that lead to large optical chirality involving the coupling between the incident light and the evanescent fields of the surface plasmons. Two of these mechanisms create superchiral regions with nonzero average chirality suitable for the excitation of chiral molecules in solution. DOI: 10.1103/PhysRevB.87.085405

引用

页数：5

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