A review of dielectric optical metasurfaces for spatial differentiation and edge detection  

作　　者：Lei WAN Danping PAN Tianhua FENG Weiping LIU Alexander A.POTAPOV 

机构地区：[1]Department of Electronic Engineering,College of Information Science and Technology,Jinan University,Guangzhou 510632,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [3]JNU-IREE RAS Joint Laboratory of Information Techniques and Fractal Signal Processing,Jinan University,Guangzhou 510632,China [4]Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes,Jinan University,Guangzhou 510632,China [5]Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Moscow 125009,Russia

出　　处：《Frontiers of Optoelectronics》2021年第2期187-200,共14页光电子前沿（英文版）

基　　金：the National Key R&D Program of China(No.2019YFB1803904);in part by the National Natural Science Foundation of China(Grant Nos.61805104,11704156,61935013,61875076,and 61865014);in part by the Open Project of Wuhan National Laboratory for Optoelectronics,China(No.2018WNLOKF015).

摘　　要：Dielectric metasurfaces-based planar optical spatial differentiator and edge detection have recently been proposed to play an important role in the parallel and fast image processing technology.With the development of dielectric metasurfaces of different geometries and resonance mechanisms,diverse on-chip spatial differentiators have been proposed by tailoring the dispersion characteristics of subwavelength structures.This review focuses on the basic principles and characteristic parameters of dielectric metasurfaces as first-and second-order spatial differentiators realized via the Green's function approach.The spatial bandwidth and polarization dependence are emphasized as key properties by comparing the optical transfer flinctions of metasurfaces for different incident wavevectors and polarizations.To present the operational capabilities of a two-dimensional spatial differentiator in image information acquisition,edge detection is described to illustrate the practicability of the device.As an application example,experimental demonstrations of edge detection for different biological cells and a flower mold are discussed,in which a spatial differentiator and objective lens or camera are integrated in three optical pathway configurations.The realization of spatial differentiators and edge detection with dielectric metasurfaces provides new opportunities for ultrafast information identification in biological imaging and machine vision.

关 键 词：dielectric metasurfaces spatial differentiator edge detection optical transfer function 

分 类 号：O43[机械工程—光学工程]