Focus control of wide-angle metalens based on digitally encoded metasurface  

作　　者：Yi Chen Simeng Zhang Ying Tian Chenxia Li Wenlong Huang Yixin Liu Yongxing Jin Bo Fang Zhi Hong Xufeng Jing 

机构地区：[1]Institute of Optoelectronic Technology,China Jiliang University,Hangzhou 310018,China [2]Centre for THz Research,China Jiliang University,Hangzhou 310018,China [3]College of Metrology&Measurement Engineering,China Jiliang University,Hangzhou 310018,China [4]College of Information Engineering,China Jiliang University,Hangzhou 310018,China

出　　处：《Opto-Electronic Advances》2024年第8期26-41,共16页光电进展（英文）

基　　金：supported in part by the Science and technology innovation leading talent project of special support plan for high-level talents in Zhejiang Province(2021R52032);Natural Science Foundation of Zhejiang Province under grant No.LY22F050001;Special project for professional degree postgraduates of Zhejiang Provincial Education Department(No.Y202353663,Y202353686);in part by the National Natural Science Foundation of China under grant No.62175224.China Jiliang University Basic Research Expenses.

摘　　要：Based on the principle of super-symmetric lens with quadratic phase gradient transformation, combined with the principle of digital coding of metasurface, we propose a wide-angle coded metalens for focusing control in two-dimensional space. This metalens achieves focus shift in the x-direction by changing the oblique incidence angle of the incident wave,and focus control in the y-direction by combining with the convolution principle of the digitally coded metasurface to achieve flexible control of light focusing in the two-dimensional plane. The metasurface unit is mainly composed of threelayer of metal structure and two layers of medium, and the transmission phase is obtained by changing the middle layer of metal structure, which in turn obtains the required phase distribution of the metalens. The design of the metalens realizes the function of the lens with a large viewing angle at the x-polarized incidence, and realizes two-dimensional focus control. Experimentally, we prepared the designed coding metalens and tested the focus control function of the wide-angle coding metalens. The experimental results are in good agreement with the design results.

关 键 词：metasurface metalens WIDE-ANGLE CODING 

分 类 号：TH74[机械工程—光学工程]