Focusing enhanced broadband metalens via height optimization  

作　　者：WANG Junjie CHEN Deli WANG Zhan XUE Qi SUN Xiaohong 

机构地区：[1]Henan Key Laboratory of Laser and Opto-electric Information Technology,School of Information Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Optoelectronics Letters》2022年第2期72-76,共5页光电子快报（英文版）

基　　金：supported by the Science and Technology Major Project of Henan Province(No.161100210200).

摘　　要：Metalenses are two-dimensional planar metamaterial lenses, which have the advantages of high efficiency and easy integration. Based on the method of spatial multiplexing, a metalens with a wide working waveband is designed by arranging Ti O2 nanopillars under the resonance phase regulation. In addition, choosing an assistant metalens with optimized heights is effective to enhance metalens’ s focusing, which is also illustrated in this paper. The metalens, designed with numerical aperture(NA) of 0.72 and center working wavelength of 600 nm, achieves the working waveband of 550-660 nm, the focus point’s size of below 420 nm, and the focusing efficiency of more than 30%.

关 键 词：FOCUS ens MULTIPLEXING 

分 类 号：TH74[机械工程—光学工程]