Pixel-level Bayer-type colour router based on metasurfaces

Abstract

The three primary colour model, i.e., red, green, and blue model, based on the colour perception of the human eye, has been widely used in colour imaging. The most common approach for obtaining colour information is to use a Bayer colour filter, which filters colour light with four pixels of an imaging sensor to form an effective colour pixel. However, its energy utilization efficiency and colour collection efficiency are limited to a low level due to the three-channel filtering nature. Here, by employing an inverse-design method, we demonstrate a pixel-level metasurface-based Bayer-type colour router that presents peak colour collection efficiencies of 58%, 59%, and 49% for red, green and blue light, and an average energy utilization efficiency as high as 84% over the visible region (400 nm–700 nm), which is twice as high as that of a commercial Bayer colour filter. Furthermore, by using a 200 µm × 200 µm metasurface-based colour router sample working with a monochromatic imaging sensor, colour imaging is further realized, obtaining an image intensity twice that achieved by a commercial Bayer colour filter. Our work innovates the mechanism of high-efficiency spectrum information acquisition, which is expected to have promising applications in the development of next-generation imaging systems.

mHealth hyperspectral learning for instantaneous spatiospectral imaging of hemodynamics

“…Foveon X3 sensors capture all incident light (three colors) within the same pixel without having three separate color channels ( 101 ). An image sensor with a color router can directly detect the entire color content without using a filter to select the intended color channel ( 102 , 103 ). Second, a higher color depth (also known as bit depth) in each pixel can further improve hyperspectral learning to avoid metamerism such that different spectral profiles result in the same RGB values.…”

Inverse Design of Multifunctional Metasurface Based on Multipole Decomposition and the Adjoint Method

“…A multiwavelength optical nanorouter is an important device in full-color imaging − and microspectrometer . The traditional image sensor array consists of a series of microlenses and/or filters, which increase the complicity and unfavorably reduce the optical efficiency. , However, this issue can be addressed by replacing them with a metasurface-based multiwavelength router.…”

Research progress of digital true color low-light-level technology

“…Nanjing university and others cooperation with HUAWEI technologies co., LTD. Zhang et al, research and development of an improved ultra filter surface pixel design [33] , compared with traditional bayer has the character of three-channel filter filter, the researchers through using the method of reverse design, presents a based on pixel level over the surface of the bayer color filter, as shown in Fig. 8(a).…”