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Affiliation of Author(s):理学院

Title of Paper:Geometry and near-field coupling effects on the refractive-index sensitivities of individual Ag nanoparticle sensors

Journal:APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Key Words:Localized surface plasmon resonance Plasmonic sensors Refractive index sensitivity Discrete dipole approximation

Abstract:The refractive-index sensitivities of sensors of individual Ag nanoparticles (including nanodisks, nanocubes, and nanoprisms) and nanoparticle clusters are investigated numerically and analytically. It is demonstrated that the refractive-index sensitivities are a nonlinear function of the peak positions of localized surface plasmon resonances (LSPRs) with fixed surrounding mediums and metal materials at optical wavelengths. Moreover, this nonlinear function is independent of Ag nanoparticle geometries and near-field couplings between components within nanoparticle clusters. In addition, the discrepancies between our results and those of literatures are also discussed. The present work facilitates choosing appropriate peak positions of LSPRs for plasmonic sensing and detections by only analytically calculating with an equation under LSPR condition.

ISSN No.:0947-8396

Translation or Not:no

Date of Publication:2017-11-01

Co-author:彭胜,Shi Daning

Correspondence Author:Du ChaoLing