High-order plasmon resonances in an Ag/Al_2O_3 core/shell nanorice  

作　　者：陈立 魏红 陈克求 徐红星 

机构地区：[1]Department of Applied Physics,Hunan University [2]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences [3]Center for Nanoscience and Nanotechnology,and School of Physics and Technology,Wuhan University

出　　处：《Chinese Physics B》2014年第2期19-24,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Basic Research and Development Program of China (Grant Nos.2009CB930700 and 2012YQ12006005);the National Natural Science Foundation of China (Grant Nos.11134013,11227407,and 11004237);the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No.KJCX2-EW-W04)

摘　　要：Using numerical simulation, we investigate the high-order plasmon resonances in individual nanostructures of an Ag nanorice core surrounded by an Al2O3 shell. The peak positions of localized surface plasmon resonances （LSPRs） are red-shifted exponentially with the increase of the dielectric shell thickness. This is due to the exponential decay of electromagnetic field intensity in the direction perpendicular to the interface. This exponential red-shift depends on the wavelength of the resonance peak instead of the resonance order. In addition, we find that the LSPRs in an Ag nanorice of 60-nm width can be perfectly described by a single linear function. These features make nanorice an ideal platform for sensing applications.Using numerical simulation, we investigate the high-order plasmon resonances in individual nanostructures of an Ag nanorice core surrounded by an Al2O3 shell. The peak positions of localized surface plasmon resonances （LSPRs） are red-shifted exponentially with the increase of the dielectric shell thickness. This is due to the exponential decay of electromagnetic field intensity in the direction perpendicular to the interface. This exponential red-shift depends on the wavelength of the resonance peak instead of the resonance order. In addition, we find that the LSPRs in an Ag nanorice of 60-nm width can be perfectly described by a single linear function. These features make nanorice an ideal platform for sensing applications.

关 键 词：localized surface plasmon resonances nanorice CORE-SHELL LSPR sensing 

分 类 号：TB383.1[一般工业技术—材料科学与工程]