中国物理B ›› 2007, Vol. 16 ›› Issue (5): 1315-1319.doi: 10.1088/1009-1963/16/5/025

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Waveguide resonance of subwavelength metallic slits

刘树田1, 王艳花2, 张岩2, 陈跃刚3   

  1. (1)Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (2)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Capital Normal University, Beijing 100037, China; (3)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Capital Normal University, Beijing 100037, China
  • 收稿日期:2006-08-02 修回日期:2006-11-27 出版日期:2007-05-20 发布日期:2007-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10604042 and 10674038) and National Basic Research Program of China (Grant No 2006CB302901).

Waveguide resonance of subwavelength metallic slits

Chen Yue-Gang(陈跃刚)a)b), Wang Yan-Hua(王艳花)a)b), Zhang Yan (张岩)a)b), and Liu Shu-Tian(刘树田)a)†   

  1. a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, Capital Normal University, Beijing 100037, China
  • Received:2006-08-02 Revised:2006-11-27 Online:2007-05-20 Published:2007-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10604042 and 10674038) and National Basic Research Program of China (Grant No 2006CB302901).

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摘要： The transmission characteristics of a metallic film with subwavelength periodic slits are investigated by using the two-dimensional finite-difference time-domain method (2D-FDTD). Two models are constructed to show the dependance of the transmission spectrum on the slit structure. A sandwiched structure is used to exhibit the contribution of the metallic wall inside slits to the extraordinary high transmission. And a filled slit structure is employed to reflect the relation between the average refractive index inside the slits and the transmission spectrum of the structure. The transmission characteristics of two structures can be explained well with the waveguide resonance theory.

关键词: electromagnetic wave propagation, metallic subwavelength periodic slits, waveguide resonance

Abstract: The transmission characteristics of a metallic film with subwavelength periodic slits are investigated by using the two-dimensional finite-difference time-domain method (2D-FDTD). Two models are constructed to show the dependance of the transmission spectrum on the slit structure. A sandwiched structure is used to exhibit the contribution of the metallic wall inside slits to the extraordinary high transmission. And a filled slit structure is employed to reflect the relation between the average refractive index inside the slits and the transmission spectrum of the structure. The transmission characteristics of two structures can be explained well with the waveguide resonance theory.

Key words: electromagnetic wave propagation, metallic subwavelength periodic slits, waveguide resonance

中图分类号:  (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

  • 78.20.Ci
68.55.-a (Thin film structure and morphology) 78.66.Bz (Metals and metallic alloys)