title: 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 infrared regions. Our results here are beneficial for the design and application of high sensitive CD sensors and other related fields.
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.|School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing, 400067, China.
authors.forename: Li
authors.initials: L
authors.lastname: Hu
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Yingzhou
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Liang
authors.initials: L
authors.lastname: Fang
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Guo
authors.initials: G
authors.lastname: Chen
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wei
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, Göteborg, SE 412 96, Sweden.
authors.forename: Yurui
authors.initials: Y
authors.lastname: Fang