Surface-enhanced circular dichroism spectroscopy mediated by nonchiral nanoantennas

被引：209

作者：

Garcia-Etxarri, Aitzol ^{[1
]}

Dionne, Jennifer A. ^{[1
,2
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 23期

基金：

美国国家科学基金会;

关键词：

CHIRAL MOLECULES; NANOCRYSTALS; SCATTERING; FIELDS;

D O I：

10.1103/PhysRevB.87.235409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate light-matter interactions for chiral molecules in the presence of nonchiral nanoantennas. Isotropic nanostructures supporting optical-frequency electric or magnetic dipoles are sufficient to locally enhance the excitation of a molecule's chiral polarizability and thus its circular dichroism spectrum. However, simultaneous electric and magnetic dipoles are necessary to achieve a net, spatially averaged enhancement. Our contribution provides a theoretical framework to understand chiral light-matter interactions at the nanoscale and sets the necessary and sufficient conditions to enhance circular dichroism spectroscopy in the presence of nanoantennas. The results may lead to new, field-enhanced, chiral spectroscopic techniques.

引用

页数：5

共 40 条

[1] Measures of chirality and angular momentum in the electromagnetic field [J].