Full-Color Quasi-Achromatic Imaging with a Dual-Functional Metasurface

作者：Xiaoyu Du, Wenjing Shen, Jian Li, Yanhao Chu, Jiacheng Sun, Junyi Wang, Jitao Ji, Chen Chen, Shining Zhu, Tao Li · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c00695 · 被引用次数：18 · 研究领域：Metamaterials and Metasurfaces Applications、Photonic Crystals and Applications、Plasmonic and Surface Plasmon Research

Achieving broadband achromaticity in the visible spectrum is critical for enhancing the imaging performance of metalenses. However, many previous studies remain constrained by small device sizes or small numerical aperture. In this study, we propose a polarization-multiplexed metalens capable of generating zero- and high-order Bessel beams to achieve quasi-achromatic correction without size limitations. An image subtraction method with the two polarization channels is developed to mitigate the Bessel beam sidelobes to improve imaging quality. Our results demonstrate an effective quasi-achromatic focusing and imaging over a continuous wavelength range of 450-700 nm with long focus depth. The image subtraction method significantly enhances the image clarity and contrast, providing new insights for full-color imaging and detection.