Chinese Optics Letters, Volume. 20, Issue 7, 073601(2022)

Inverse design of 1D color splitter for high-efficiency color imaging

Jiahao Li1, Mengwei Cao1,2, Weili Liang1, Yilin Zhang1, Zhenwei Xie1,*, and Xiaocong Yuan1
Author Affiliations
  • 1Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology & Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
  • 2Department of Physics, Harbin Institute of Technology, Harbin 150001, China
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    We introduce a simple one-dimensional (1D) structure in the design of 1D color splitters (1D-CSs) with RGB unit cells for color imaging and propose a single-to-double-layer design in 1D-CSs. Based on inverse design metasurfaces, we demonstrate numerically a single-layer 1D-CS with a full-color efficiency of 46.2% and a double-layer 1D-CS with a full-color efficiency of 48.2%; both of them are significantly higher than that of traditional color filters. Moreover, we demonstrate a 1D-CS that has application value by evaluating the double-layer 1D-CS’s performances in terms of incident angle sensitivity, polarization angle sensitivity, and assembly tolerance.


    1. Introduction

    Since color filters allow high selectivity of individual colors and simple image processing, using color filters to separate red (R), green (G), and blue (B) bands has always been a research hotspot in color imaging[13]. As the pixel sizes of color image sensors are becoming smaller and smaller to meet higher-resolution color imaging, the incoming average photon count per pixel is also becoming less and less[4,5]. This trend brings challenges to color filters for its inherent 2/3 light losses in each color pixel filter, whether in one-dimensional (1D) color filters such as RGB arrays with RGB unit cells or two-dimensional (2D) color filters such as Bayer filter arrays with RGB unit cells[6].


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    Jiahao Li, Mengwei Cao, Weili Liang, Yilin Zhang, Zhenwei Xie, Xiaocong Yuan. Inverse design of 1D color splitter for high-efficiency color imaging[J]. Chinese Optics Letters, 2022, 20(7): 073601

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    Paper Information

    Category: Nanophotonics, Metamaterials, and Plasmonics

    Received: Feb. 1, 2022

    Accepted: Apr. 14, 2022

    Posted: Apr. 15, 2022

    Published Online: May. 6, 2022

    The Author Email: Zhenwei Xie (



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