Optical analog computing of spatial differentiation and edge detection with dielectric metasurfaces

被引：72

作者：

Wan, Lei ^{[1
,2
,3
]}

Pan, Danping ^{[1
]}

Yang, Shuaifeng ^{[1
]}

Zhang, Wei ^{[1
,2
]}

Potapov, Alexander A. ^{[1
,2
]}

Wu, Xia ^{[1
,2
]}

Liu, Weiping ^{[1
,2
]}

Feng, Tianhua ^{[1
,2
]}

Li, Zhaohui ^{[4
,5
,6
]}

机构：

[1] Jinan Univ, Coll Informat Sci & Technol, Dept Elect Engn, Guangzhou 510632, Peoples R China

[2] Jinan Univ, JNU IREE RAS Joint Lab Informat Tech & Fractal Si, Guangzhou 510632, Peoples R China

[3] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China

[4] Sun Yet Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou 511400, Peoples R China

[5] Sun Yet Sen Univ, Sch Elect & Informat Technol, Guangzhou 511400, Peoples R China

[6] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China

来源：

OPTICS LETTERS | 2020年 / 45卷 / 07期

基金：

中国国家自然科学基金;

关键词：

LAPLACE OPERATOR;

D O I：

10.1364/OL.386986

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose and demonstrate that optical analog computing of spatial differentiation and edge detection can be realized with a single layer of dielectric metasurface. The optical transfer function for second-order derivation is obtained by engineering the spatial dispersion of electric dipole resonance supported by the silicon nanodisks in the metasurface. Benefiting from this unique mechanism of electric dipole resonance, spatial differentiation can be performed for two dimensions and arbitrary polarization with a large spatial bandwidth and high efficiency at the visible wavelength. Explicitly, we have numerically validated the application with one-dimensional spatial functions as well as an image, and the results show excellent performance. Our study can facilitate the research of optical computing with artificial nanostructures. (C) 2020 Optical Society of America

引用

页码：2070 / 2073

页数：4

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