EDITOR＇S NOTE： As the widening gap between the rich and poor has become a major byproduct of China＇s nonstop economic growth over the past decades, the improvement of the disadvantaged group＇s livelihood has becom...EDITOR＇S NOTE： As the widening gap between the rich and poor has become a major byproduct of China＇s nonstop economic growth over the past decades, the improvement of the disadvantaged group＇s livelihood has become a top government concern. While numerous cities are working out their plans for ＂livelihood improvement projects,＂ local governments are making efforts to establish a sustainable mechanism that provides prompt, adequate relief to the needy. Licheng District in Jinan, capital of Shandong province, sets an example.展开更多
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 op...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.展开更多
文摘EDITOR＇S NOTE： As the widening gap between the rich and poor has become a major byproduct of China＇s nonstop economic growth over the past decades, the improvement of the disadvantaged group＇s livelihood has become a top government concern. While numerous cities are working out their plans for ＂livelihood improvement projects,＂ local governments are making efforts to establish a sustainable mechanism that provides prompt, adequate relief to the needy. Licheng District in Jinan, capital of Shandong province, sets an example.
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.
文摘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.
