We introduce subwavelength color routers with perfect optical efficiency in a red-green-green-blue (RGGB) Bayer layout for solid state image sensors. This is the first demonstration of a subwavelength device concept that shows the full potential of color routing, i.e., perfect routing without loss of photons, with a broadband, polarization-independent, and angular robust response. As an example, we show a color router for 320 nm wide image sensor pixels, which are two times smaller than the smallest state-of-the-art pixels, that features perfect optical efficiency, i.e., no crosstalk between color channels, no reflections, and no leakage into non-photodetector regions, even though the pixel photodetectors are 2–3 times smaller than the wavelength of the incident light. Our color router outperforms all other color separation approaches and can replace the entire optical stack in solid state image sensors.

中文翻译：

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具有完美光学效率的亚波长拜耳 RGB 色彩路由器

我们在用于固态图像传感器的红-绿-绿-蓝 (RGGB) 拜耳布局中引入了具有完美光学效率的亚波长彩色路由器。这是亚波长器件概念的首次演示，展示了色彩路由的全部潜力，即完美的路由没有光子损失，具有宽带、偏振无关和角度鲁棒响应。例如，我们展示了一个用于 320 nm 宽图像传感器像素的颜色路由器，它比最先进的最小像素小两倍，具有完美的光学效率，即颜色通道之间没有串扰，没有反射，并且没有泄漏到非光电探测器区域，即使像素光电探测器比入射光的波长小 2-3 倍。