期刊
ACS PHOTONICS
卷 7, 期 7, 页码 1799-1805出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00473
关键词
computational metasurfaces; analog processing; nonlocality; Fano resonance; polarization-insensitive
类别
资金
- Air Force Office of Scientific Research MURI [FA9550-17-1-0002]
- Dutch Research Council (NWO)
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.
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