Giant transmission Goos-Hanchen shift in surface plasmon polaritons excitation and its physical origin  

作　　者：杨阳 刘菊 李志远 

机构地区：[1]Laboratory of Optical Physics,Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第7期234-239,共6页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2013CB632704);the National Natural Science Foundation of China(Grant No.11374357)

摘　　要：Excitation of surface plasmon polaritons（SPPs） propagating at the interface between a dielectric medium and a silver thin film by a focused Gaussian beam in a classical Kretschmann prism setup is studied theoretically. We find that the center of the transmitted Gaussian evanescent wave has a giant lateral shift relative to the incident Gaussian beam center for a wide range of incident angle and Gaussian beam wavelength to excite SPPs, which can be more than two orders of magnitude larger than the silver film thickness. The phenomenon is closely related with the conventional Goos–Hnchen effect for total internal reflection of light beam, and it is called the transmission Goos–Hnchen shift. We find that this lateral shift depends heavily on the excitation wavelength, incident angle, and the silver layer thickness. Finite-difference time-domain simulations show that this transmission Goos–Hnchen shift is induced by a unique dynamical process of excitation, transport, and leakage of SPPs.Excitation of surface plasmon polaritons（SPPs） propagating at the interface between a dielectric medium and a silver thin film by a focused Gaussian beam in a classical Kretschmann prism setup is studied theoretically. We find that the center of the transmitted Gaussian evanescent wave has a giant lateral shift relative to the incident Gaussian beam center for a wide range of incident angle and Gaussian beam wavelength to excite SPPs, which can be more than two orders of magnitude larger than the silver film thickness. The phenomenon is closely related with the conventional Goos–Hnchen effect for total internal reflection of light beam, and it is called the transmission Goos–Hnchen shift. We find that this lateral shift depends heavily on the excitation wavelength, incident angle, and the silver layer thickness. Finite-difference time-domain simulations show that this transmission Goos–Hnchen shift is induced by a unique dynamical process of excitation, transport, and leakage of SPPs.

关 键 词：Goos–Hnchen shift surface plasmon resonance thin film 

分 类 号：O53[理学—等离子体物理]