Extraordinary Transmission through Metallic Grating with Subwavelength Slits for S-Polarization Illumination  

作　　者：苑光辉 王沛 张斗国 焦小瑾 闵长俊 明海 

机构地区：[1]Department of Physics, University of Science and Technology of China, Hefei 230026

出　　处：《Chinese Physics Letters》2007年第6期1600-1602,共3页中国物理快报（英文版）

基　　金：Supported by the National Science Foundation of China under Grant No 10474093, and the National Basic Research Programme of China under Grant No 2006cb302905.

摘　　要：Based on the rigorous coupled-wave analysis algorithm, we have systematically analysed the effect of the geometrical parameters of a dielectric film coated metallic grating with subwavelength slits on extraordinary optical transmission for s-polarization illumination. Results show that the dielectric film which sustains a waveguide electromagnetic mode on the top of the metallic lamellar grating can strongly enhance the transmittance, the positions of the transmission peaks are mainly determined by the period of the metallic grating, the thickness and refractive index of the dielectric film. This structure shows potential applications in excellent polarizers or polarization-isotropic devices at infrared spectral range by appropriately choosing the geometrical parameters.Based on the rigorous coupled-wave analysis algorithm, we have systematically analysed the effect of the geometrical parameters of a dielectric film coated metallic grating with subwavelength slits on extraordinary optical transmission for s-polarization illumination. Results show that the dielectric film which sustains a waveguide electromagnetic mode on the top of the metallic lamellar grating can strongly enhance the transmittance, the positions of the transmission peaks are mainly determined by the period of the metallic grating, the thickness and refractive index of the dielectric film. This structure shows potential applications in excellent polarizers or polarization-isotropic devices at infrared spectral range by appropriately choosing the geometrical parameters.

关 键 词：SURFACE-RELIEF GRATINGS OPTICAL-TRANSMISSION HOLE ARRAYS LIGHT PLASMONS 

分 类 号：O43[机械工程—光学工程]