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

Jiahao Li; Mengwei Cao; Weili Liang; Yilin Zhang; Zhenwei Xie; Xiaocong Yuan

doi:10.3788/COL202220.073601

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

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

Jiahao Li¹, Mengwei Cao^1,2, Weili Liang¹, Yilin Zhang¹, Zhenwei Xie^1,*, and Xiaocong Yuan¹

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.

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color imaging color splitter inverse design metasurfaces

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^[1–3]. 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 $\sim 2 / 3$ 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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