Samsung patent application US20150286059 "Image sensor having improved light utilization efficiency" by Seokho Yun, Sunghyun Nam, Sookyoung Roh, Changgyun Shin, and Hyungue Hong proposes a color-splitting optics integrated into each pixel:
Another Samsung patent application US20150286060 "Color separation device and image sensor including the color separation device" by Sookyoung Roh, Sunghyun Nam, and Changgyun Shin proposes to use refraction factor gradients to split the light into colors:
Another Samsung patent application US20150286060 "Color separation device and image sensor including the color separation device" by Sookyoung Roh, Sunghyun Nam, and Changgyun Shin proposes to use refraction factor gradients to split the light into colors: