中国物理B ›› 2015, Vol. 24 ›› Issue (7): 74201-074201.doi: 10.1088/1674-1056/24/7/074201

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Giant transmission Goos–Hänchen shift in surface plasmon polaritons excitation and its physical origin

杨阳, 刘菊, 李志远   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2014-11-09 修回日期:2015-01-19 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB632704) and the National Natural Science Foundation of China (Grant No. 11374357).

Giant transmission Goos–Hänchen shift in surface plasmon polaritons excitation and its physical origin

Yang Yang (杨阳), Liu Ju (刘菊), Li Zhi-Yuan (李志远)   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2014-11-09 Revised:2015-01-19 Online:2015-07-05 Published:2015-07-05
  • Contact: Li Zhi-Yuan E-mail:lizy@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB632704) and the National Natural Science Foundation of China (Grant No. 11374357).

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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–Hänchen effect for total internal reflection of light beam, and it is called the transmission Goos–Hänchen 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–Hänchen shift is induced by a unique dynamical process of excitation, transport, and leakage of SPPs.

关键词: Goos-Hä, nchen shift, surface plasmon resonance, thin film

Abstract: 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–Hänchen effect for total internal reflection of light beam, and it is called the transmission Goos–Hänchen 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–Hänchen shift is induced by a unique dynamical process of excitation, transport, and leakage of SPPs.

Key words: Goos-Hä, nchen shift, surface plasmon resonance, thin film

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.15.Eq (Optical system design) 42.25.Dd (Wave propagation in random media) 52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))