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)†
a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, Capital Normal University, Beijing 100037, China
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.
Received: 02 August 2006
Revised: 27 November 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
Chen Yue-Gang(陈跃刚), Wang Yan-Hua(王艳花), Zhang Yan (张岩), and Liu Shu-Tian(刘树田) Waveguide resonance of subwavelength metallic slits 2007 Chinese Physics 16 1315
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