Accurate Modeling of Dark-Field Scattering Spectra of Plasmonic Nano structures

作者：Jiang Liyong; Yin Tingting; Dong Zhaogang; Liao Mingyi; Tan Shawn J; Goh Xiao Ming; Allioux David; Hu Hailong; Li Xiangyin; Yang Joel K W; Shen Zexiang

来源：ACS Nano, 2015, 9(10): 10039-10046.

DOI：10.1021/acsnano.5b03622

• dark-field scattering spectra
• gold nanodisks
• retardation effects
• localized surface plasmon resonance
• quasi-static limit

Dark-field microscopy is a widely used tool for measuring the optical resonance of plasnnonic nanostructures. However, current numerical methods for simulating the dark-field scattering spectra were carried out with plane wave illumination either at normal incidence or at an oblique angle from one direction. In actual experiments, light is focused onto the sample through an annular ring within a range of glancing angles. In this paper, we present a theoretical model capable of accurately simulating the dark-field light source with an annular ring. Simulations correctly reproduce a counterintuitive blue shift in the scattering spectra from gold nanodisks with a diameter beyond 140 nm. We believe that our proposed simulation method can be potentially applied as a general tool capable of simulating the dark-field scattering spectra of plasmonic nanostructures as well as other dielectric nanostructures with sizes beyond the quasi-static limit.

• 出版日期2015-10
• 单位南京理工大学