Catrysse Peter B, Zhao Nathan, Jin Weiliang, Fan Shanhui
E. L. Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, USA.
Department of Applied Physics, Stanford University, Stanford, USA.
Nanophotonics. 2022 Mar 30;11(10):2381-2387. doi: 10.1515/nanoph-2022-0069. eCollection 2022 May.
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.
我们为固态图像传感器引入了采用红-绿-绿-蓝（RGGB）拜耳布局且具有完美光学效率的亚波长彩色路由器。这是首次展示亚波长器件概念，该概念展现了彩色路由的全部潜力，即实现无光子损失的完美路由，具备宽带、偏振无关且角度稳健的响应。例如，我们展示了一款适用于320纳米宽图像传感器像素的彩色路由器，该像素比最小的现有技术像素小两倍，具有完美的光学效率，即颜色通道之间无串扰、无反射且无泄漏到非光电探测器区域，即便像素光电探测器比入射光波长小2至3倍。我们的彩色路由器性能优于所有其他颜色分离方法，并且能够取代固态图像传感器中的整个光学堆栈。
