Wideband optical edge detection based on dielectric metasurface

作者：Xinyi Bi, Xuyue Guo, Xuanguang Wu, Xinhao C. Fan, Bingyan Wei, Dandan Wen, Sheng Liu, Jianlin Zhao, Peng Li · 发表于：Applied Physics Letters · 年份：2023 · DOI：10.1063/5.0161145 · 被引用次数：34 · 研究领域：Metamaterials and Metasurfaces Applications、Advanced Antenna and Metasurface Technologies、Antenna Design and Analysis

Optical image edge detection manifests itself as the advantages of fast speed, low energy consumption, parallel operation, and large information capacity, playing a crucial role in object and image recognition in the realms of biology, medicine, and artificial intelligence. In this paper, a dielectric metasurface that can achieve object edge detection in the full visible band is proposed. By combining two optical differential methods referring to spatial spectrum-dependent transmission function and 4f system-based spatial spectrum phase shift, a tetratomic macropixel metasurface that enables polarization-correlated interference based on dual geometric phase modulation is designed, which can achieve object edge detection under 473, 530, and 633 nm wavelengths, and even under white light conditions. This coherent filtering metasurface operator provides a flexible approach for achieving wideband two-dimensional edge detection.