Fano resonance assisting plasmonic circular dichroism from nanorice heterodimers for extrinsic chirality.

ABSTRACT: In this work, the circular dichroisms (CD) of nanorice heterodimers consisting of two parallel arranged nanorices with the same size but different materials are investigated theoretically. Symmetry-breaking is introduced by using different materials and oblique incidence to achieve strong CD at the vicinity of Fano resonance peaks. We demonstrate that all Au-Ag heterodimers exhibit multipolar Fano resonances and strong CD effect. A simple quantitative analysis shows that the structure with larger Fano asymmetry factor has stronger CD. The intensity and peak positions of the CD effect can be flexibly tuned in a large range by changing particle size, shape, the inter-particle distance and surroundings. Furthermore, CD spectra exhibit high sensitivity to ambient medium in visible and near inf

SUBMITTER: Hu L 

PROVIDER: S-EPMC4633605 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature