Accurate Modeling of Dark-Field Scattering Spectra of Plasmonic Nanostructures

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• 作者：Liyong Jiang ; Tingting Yin ; Zhaogang Dong ; Mingyi Liao ; Shawn J. Tan ; Xiao Ming Goh ; David Allioux ; Hailong Hu ; Xiangyin Li ; Joel K. W. Yang ; Zexiang Shen
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：10039-10046
• 全文大小：634K
• ISSN：1936-086X

文摘

Dark-field microscopy is a widely used tool for measuring the optical resonance of plasmonic 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.