Polarization independent freeform color router for subwavelength-pixel CMOS image sensors

Sungmo Ahn; Peter B. Catrysse; Sangeun Mun; Choonlae Cho; Minwoo Lim; Sookyoung Roh; Seokho Yun; Shanhui Fan

doi:10.1117/12.2647788

17 March 2023 Polarization independent freeform color router for subwavelength-pixel CMOS image sensors

Sungmo Ahn, Peter B. Catrysse, Sangeun Mun, Choonlae Cho, Minwoo Lim, Sookyoung Roh, Seokho Yun, Shanhui Fan

Author Affiliations +

Proceedings Volume PC12432, High Contrast Metastructures XII; PC124320A (2023) https://doi.org/10.1117/12.2647788
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We proposed the structural symmetry in a freeform color router design for subwavelength-pixel Bayer image sensors to insure the polarization independence as well as the symmetric field profiles. Although the reduced degrees-of-freedom lowers color routing efficiency compared to non-symmetric structures, it still outperforms the conventional color filtering approach. Numerical simulation confirmed that the proposed symmetric color router design for 0.5um-pixel Bayer sensor can achieve the peak optical efficiencies of ~0.8 for red and blue, ~0.7 for green regardless of the polarization direction (corresponds 3.2 times and 1.4 times enhancement over the ideal color filters). We believe that this study presents a more practical and efficient way to design color routers for CMOS image sensor applications.

Conference Presentation

Citation Download Citation

Sungmo Ahn, Peter B. Catrysse, Sangeun Mun, Choonlae Cho, Minwoo Lim, Sookyoung Roh, Seokho Yun, and Shanhui Fan "Polarization independent freeform color router for subwavelength-pixel CMOS image sensors", Proc. SPIE PC12432, High Contrast Metastructures XII, PC124320A (17 March 2023); https://doi.org/10.1117/12.2647788

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