The separation between s- and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This ...The separation between s- and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design method to obtain edge filters with non-polarization at incidence angle of 45°. The polarization separation at 50% trans-mittance for a long-wave-pass filter and a short-wave-pass filter is 0.3 nm and 0.1 nm respectively. The design method is based on a broadband Fabry-Perot thin-film interference filter in which the higher or lower interference band at both sides of the main transmittance peak can be used for initial design of long-wave-pass filter or short-wave-pass filter and then can be refined to reduce the transmittance ripples. The spacer 2H2L2H or 2L2H2L of the filter is usually taken. Moreover, the method for expanding the bandwidth of rejection and transmission is explained. The bandwidth of 200 nm for both rejection region and transmission band is obtained at wavelength 1550 nm. In this way, the long-wave-pass and short-wave-pass edge filters with zero separation between two polarization components can easily be fabricated.展开更多
Reflective and transmissive film interference colors were calculated for DLC films on the Si and SiO 2 substrates.The calculated interference colors were compared with photographed colors of the prepared DLC samples.T...Reflective and transmissive film interference colors were calculated for DLC films on the Si and SiO 2 substrates.The calculated interference colors were compared with photographed colors of the prepared DLC samples.The observed film colors were found to match reasonably well with the corresponding calculated colors,indicating that DLC film colors come from interference instead of color center effects.Color charts for DLC films on the Si and SiO 2 substrates with various optical gaps were constructed,and the relationship between interference color and film properties such as optical gap,thickness and substrate were investigated.Usefulness of the calculated color charts in estimating optical gap or thickness of DLC films were demonstrated.展开更多
基金Project (No. 60078001) supported by the National Natural ScienceFoundation of China
文摘The separation between s- and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design method to obtain edge filters with non-polarization at incidence angle of 45°. The polarization separation at 50% trans-mittance for a long-wave-pass filter and a short-wave-pass filter is 0.3 nm and 0.1 nm respectively. The design method is based on a broadband Fabry-Perot thin-film interference filter in which the higher or lower interference band at both sides of the main transmittance peak can be used for initial design of long-wave-pass filter or short-wave-pass filter and then can be refined to reduce the transmittance ripples. The spacer 2H2L2H or 2L2H2L of the filter is usually taken. Moreover, the method for expanding the bandwidth of rejection and transmission is explained. The bandwidth of 200 nm for both rejection region and transmission band is obtained at wavelength 1550 nm. In this way, the long-wave-pass and short-wave-pass edge filters with zero separation between two polarization components can easily be fabricated.
基金supported in part by the National Basic Research Programof China (Grant No. 2012CB933502)
文摘Reflective and transmissive film interference colors were calculated for DLC films on the Si and SiO 2 substrates.The calculated interference colors were compared with photographed colors of the prepared DLC samples.The observed film colors were found to match reasonably well with the corresponding calculated colors,indicating that DLC film colors come from interference instead of color center effects.Color charts for DLC films on the Si and SiO 2 substrates with various optical gaps were constructed,and the relationship between interference color and film properties such as optical gap,thickness and substrate were investigated.Usefulness of the calculated color charts in estimating optical gap or thickness of DLC films were demonstrated.
