Yang Chenying, Hong Liang, Shen Weidong, Zhang Yueguang, Liu Xu, Zhen Hongyu
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China.
Opt Express. 2013 Apr 22;21(8):9315-23. doi: 10.1364/OE.21.009315.
We propose three color filters (red, green, blue) based on a two-dimensional (2D) grating, which maintain the same perceived specular colors for a broad range of incident angles with the average polarization. Particle swarm optimization (PSO) method is employed to design these filters for the first time to our knowledge. Two merit functions involving the reflectance curves and color difference in CIEDE2000 formula are respectively constructed to adjust the structural parameters during the optimization procedure. Three primary color filters located at 637nm, 530nm and 446nm with high saturation are obtained with the peak reflectance of 89%, 83%, 66%. The reflectance curves at different incident angles are coincident and the color difference is less than 8 for the incident angle up to 45°. The electric field distribution of the structure is finally studied to analyze the optical property.
我们提出了基于二维（2D）光栅的三种颜色滤光片（红色、绿色、蓝色），对于具有平均偏振的大范围入射角，它们能保持相同的感知镜面颜色。据我们所知，首次采用粒子群优化（PSO）方法来设计这些滤光片。在优化过程中，分别构建了两个涉及反射率曲线和CIEDE2000公式中色差的 merit 函数，以调整结构参数。获得了位于637nm、530nm和446nm处的三个高饱和度原色滤光片，其峰值反射率分别为89%、83%、66%。不同入射角下的反射率曲线重合，对于高达45°的入射角，色差小于8。最后研究了该结构的电场分布以分析其光学特性。
