Analysis of waveguide structure for surface plasmon polariton interference
Wang Jing-Quan(王景全)a),Liang Hui-Min(梁慧敏)b),Fang Liang(方亮)c), Li Min(李敏)a),Niu Xiao-Yun(牛晓云)a), and Du Jing-Lei(杜惊雷)a)†
a Physics Department, Sichuan University, Chengdu 610064, China; b College of Science, Hebei University of Engineering, Hebei 056038, China; c Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
Abstract This paper describes a multi-reflected mode based on a narrow waveguide to enlarge the interferential area of surface plasmon polaritons (SPPs). A reasonable thickness of metal film is coated under the waveguide, the incident angle and the waveguide thickness are optimized in order to effectively increase interferential area. This is a key point for research into the Goos--Hänchen shift to optimize the waveguide thickness. Finally, the SPP interferential field is simulated with the finite-difference time-domain (FDTD) technique to prove the optimized results, and indicates that not only is the interferential area enlarged, but the high contrast is also maintained. Furthermore, the mode can fabricate some specific interferential patterns by adding some modulating techniques to the waveguide. So the mode has potential application in the fabrication of sub-wavelength patterns.
Received: 10 January 2009
Revised: 17 March 2009
Accepted manuscript online:
PACS:
73.20.Mf
(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
Fund: Project supported by the National
Basic Research of China (Grant No 2006CD302902), the National
Natural Science Foundation of China (Grant Nos 60676024 and
60878031) and the Specialized Research Fund of China for the
Doctoral Program of Higher Education (Grant No 20060610006).
Cite this article:
Wang Jing-Quan(王景全),Liang Hui-Min(梁慧敏),Fang Liang(方亮), Li Min(李敏),Niu Xiao-Yun(牛晓云), and Du Jing-Lei(杜惊雷) Analysis of waveguide structure for surface plasmon polariton interference 2009 Chin. Phys. B 18 4870
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