Numerical analysis of surface plasmon nanocavities formed in thickness-modulated metal-insulator-metal waveguides  

作　　者：刘建龙 林杰 赵海发 张岩 刘树田 

机构地区：[1]Department of Physics,Harbin Institute of Technology [2]School of Electrical Engineering and Automation,Harbin Institute of Technology [3]Department of Physics,Capital Normal University

出　　处：《Chinese Physics B》2010年第5期269-275,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 10674038 and 10604042);the National Basic Research Program of China (Grant No. 2006CB302901)

摘　　要：The enhancement characteristics of the local field in the surface plasmon nanocavities are investigated numerically. The cavity is constructed by placing a defect structure in the thickness-modulated metal-insulator-metal waveguide Bragg gratings. The characteristic impedance based transfer matrix method is used to calculate the transmission spectra and the resonant wavelength of the cavities with various geometric parameters. The finite-difference time- domain method is used to obtain the field pattern of the resonant mode and validate the results of the transfer matrix method. The calculation and simulation results reveal the existence of resonant wavelength shift and intensity variation with structural parameters, such as the modulation period of the gratings, the length and the width of the defect structure. Both numerical analysis and theoretical interpretation on these phenomena are given in details.The enhancement characteristics of the local field in the surface plasmon nanocavities are investigated numerically. The cavity is constructed by placing a defect structure in the thickness-modulated metal-insulator-metal waveguide Bragg gratings. The characteristic impedance based transfer matrix method is used to calculate the transmission spectra and the resonant wavelength of the cavities with various geometric parameters. The finite-difference time- domain method is used to obtain the field pattern of the resonant mode and validate the results of the transfer matrix method. The calculation and simulation results reveal the existence of resonant wavelength shift and intensity variation with structural parameters, such as the modulation period of the gratings, the length and the width of the defect structure. Both numerical analysis and theoretical interpretation on these phenomena are given in details.

关 键 词：surface plasmon NANOCAVITY local field enhancement 

分 类 号：TB383.1[一般工业技术—材料科学与工程]