Dual-Polarization Analog 2D Image Processing with Nonlocal Metasurfaces
Dual-Polarization Analog 2D Image Processing with Nonlocal Metasurfaces
复制标题
基于非局部亚曲面的双极化模拟二维图像处理
DOI：
10.1021/acsphotonics.0c00473
复制
发表时间：
2020-07-15
期刊：
影响因子：
7
通讯作者：
Alu, Andrea
中科院分区：
文献类型：
--
作者：
Kwon, Hoyeong;Cordaro, Andrea;Alu, Andrea
使用超颖表面的光学模拟计算已经成为众多研究的主题，旨在在紧凑的设备中实现高效和超快的图像处理。迄今为止，所提出的方法在空间分辨率、总体效率、偏振和方位角依赖性方面显示出局限性。在这里，我们提出了一个偏振不敏感的超颖表面的设计与定制的非局域性的基础上的Fano共振响应，使奇数和偶数阶的模拟数学运算的传入图像。超颖表面是由单层三角形晶格的孔在悬浮的硅膜，这引起了强烈的非局部响应的横向空间频谱。我们的论文提供了一种路径，实现高效的光学超颖表面执行各向同性和偏振不敏感的边缘检测的任意二维光学图像。
Optical analog computing using metasurfaces has been the subject of numerous studies, aimed at implementing highly efficient and ultrafast image processing in a compact device. The proposed approaches to date have shown limitations in terms of spatial resolution, overall efficiency, polarization and azimuthal angular dependence. Here, we present the design of a polarization-insensitive metasurface with tailored nonlocality based on a Fano resonant response, enabling both odd- and even-order analog mathematical operations on an incoming image. The metasurface is formed by a single-layered triangular lattice of holes in a suspended silicon membrane, which induces a strong nonlocal response in the transverse spatial frequency spectrum. Our paper provides a path to realize highly efficient optical metasurfaces performing isotropic and polarization-insensitive edge detection on an arbitrary 2D optical image.