基于金属光栅在可见光波段(400～760 nm)的电磁波传输及异常透射特性,设计 并实现了一种由衬底、 介质-金属复合结构以及金属光栅层组成的彩色滤波器。采用有效介质理论(EMT)并结合严格耦合波分析(RCWA)方 法系统分析了结构参数对透射光谱的影响,结果表明所设计的光栅结构可以有效提高滤波器的角度容忍性,得 到了红绿蓝(RGB)三色滤波器优化的结构参数,获得了具有高透射率和角度不敏感特性的光谱输出;红色、绿色、 蓝色对应的滤波器谐振波长分别为705、590、452 nm,透射率极值分别达到66.4%、81.24%、81.23%。

Based on the electromagnetic wave propagation and abnormal transmission characteristics of metal gratings in the visible light band(400～760 nm), a color filter composed of substrate, dielectric/metal composite structure and metal grating layer is designed and implemented. Influences of structural parameters on transmission spectrum are systematically analyzed by using effective medium theory(EMT) and rigorous coupled wave analysis(RCWA) method. Results show that the designed grating structure can effectively improve angle tolerance of the filter. The optimized structure parameters of red, green and blue(RGB) filters are obtained, and the spectral output with both high transmittance and angle insensitivity is obtained. The resonant wavelengths of the filters corresponding to red, green and blue are 705, 590, 452 nm, and the transmittance extremum reaches 66.4%, 81.24% and 81.23% respectively.