Dual-Polarization Analog 2D Image Processing with Nonlocal Metasurfaces,ACS Photonics

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Dual-Polarization Analog 2D Image Processing with Nonlocal Metasurfaces
ACS Photonics ( IF 6.5 ) Pub Date : 2020-06-09 , DOI: 10.1021/acsphotonics.0c00473
Hoyeong Kwon ₁ , Andrea Cordaro _{2,

3} , Dimitrios Sounas ₄ , Albert Polman ₃ , Andrea Alù _{1,

5,

6}

Affiliation

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.

中文翻译：

具有非局部超表面的双极化模拟2D图像处理

使用超表面的光学模拟计算已成为众多研究的主题，旨在在紧凑的设备中实现高效，超快的图像处理。迄今为止，所提出的方法在空间分辨率，整体效率，极化和方位角依赖性方面显示出局限性。在这里，我们介绍了基于Fano共振响应的具有定制非局部性的对偏振不敏感的超颖表面的设计，可对传入图像进行奇数和偶数阶模拟数学运算。超表面由悬浮的硅膜中的单层三角形孔洞形成，在横向空间频谱中引起强烈的非局部响应。

更新日期：2020-07-15

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