Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure  

作　　者：王彬兵 周骏 陈栋 方云团 陈明阳 

机构地区：[1]Institute of Photonics, Faculty of Science, Ningbo University [2]School of Computer Science and Telecommunication Engineering, Jiangsu University [3]School of Mechanical Engineering, Jiangsu University

出　　处：《Chinese Physics B》2015年第8期517-522,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61275153 and 61320106014);the Natural Science Foundation of Zhejiang Province,China(Grant No.LY12A04002);the Natural Science Foundation of Ningbo City,China(Grant Nos.2010D10018 and 2012A610107);the K.C.Wong Magna Foundation of Ningbo University,China

摘　　要：According to the plasmon hybridization theory, the plasmon resonance characteristics of the gold nanocrescent/nanoring(NCNR) structure are systematically investigated by the finite element method. It is found that the extinction spectra of NCNR structure exhibit multiple plasmon resonance peaks, which could be attributed to the result of the plasmon couplings between the multipolar plasmon modes of nanocrescent and the dipolar, quadrupolar, hexapolar, octupolar,decapolar plasmon modes of nanoring. By changing the geometric parameters, the intense and separate multiple plasmon resonance peaks are obtained and can be tuned in a wide wavelength range. It is further found that the plasmon coupling induces giant multipole electric field enhancements around the tips of the nanocrescent. The tunable and intense multiple plasmon resonances of NCNR structure may provide effective applications in multiplex biological sensing.According to the plasmon hybridization theory, the plasmon resonance characteristics of the gold nanocrescent/nanoring(NCNR) structure are systematically investigated by the finite element method. It is found that the extinction spectra of NCNR structure exhibit multiple plasmon resonance peaks, which could be attributed to the result of the plasmon couplings between the multipolar plasmon modes of nanocrescent and the dipolar, quadrupolar, hexapolar, octupolar,decapolar plasmon modes of nanoring. By changing the geometric parameters, the intense and separate multiple plasmon resonance peaks are obtained and can be tuned in a wide wavelength range. It is further found that the plasmon coupling induces giant multipole electric field enhancements around the tips of the nanocrescent. The tunable and intense multiple plasmon resonances of NCNR structure may provide effective applications in multiplex biological sensing.

关 键 词：localized surface plasmon resonance field enhancement coherent couplings biological sensors 

分 类 号：TB383.1[一般工业技术—材料科学与工程]