多波长消色差全介质超透镜设计  

Design for All-dielectric Achromatic Metalens with Multi-wavelength

作　　者：王文涛 罗春华[1] 罗宇 赵达 WANG Wen-tao;LUO Chun-hua;LUO Yu;ZHAO Da(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022;Shenzhen University,ATR Key Laboratory of Defense Science and Technology,Shenzhen 518060)

机构地区：[1]长春理工大学光电工程学院,长春130022 [2]深圳大学ATR国防科技重点实验室,深圳518060

出　　处：《长春理工大学学报（自然科学版）》2019年第6期18-22,共5页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省科技厅项目(2018021028GX)

摘　　要：介质超透镜因为其超薄、紧凑、且在波长尺度以下的单层平面结构特性引发了很多团队进行研究。然而,由于天然材料的原因,其色散问题非常明显,相比于传统透镜消色差的方法,超透镜的消色差避免了其他像差的干扰,同时结构也不会那么笨重。通过精心设计多个纳米柱结构,可以在不同波长下独立工作,从而实现良好的色散控制。设计了一个全介质超透镜,其NA为0.5623,FWHM分别为464.2 nm,485.5 nm,583.1 nm。利用几何相位调控实现了对三个波长(473 nm,532 nm以及632.8 nm)的消色差设计。此超透镜的设计为不断发展的平面光学在消色差问题上提供了一种解决方法,同时也一定程度上引导了连续宽光谱消色差元件的设计,具有重要意义。Dielectric metalens have attracted great attention due to their ultra-thin,compact,single-layer planar struc-ture below the wavelength scale.However,due to the natural material,the dispersion problem is very obvious.Com-pared with the traditional lens achromati-c method,the achromatic of metalens avoids the interference of other aberra-tions,and the structure is not so bulky.By carefully designing several nano structures,they can work i-ndependently at different wavelengths,thus achieving good dispersion control.A dielectric metalens is designed,the NA is 0.5623,FWHM is 464.2 nm,485.5 nm,583.1 nm.Achromatic design of three wavelengths(473 nm,532 nm and 632.8 nm)is realized by geometric phase.The design of this metalens provides a solution to the problem of achromatism in the de-veloping plane optics,and al-so guides the design of achromatic elements with continuous broad spectrum to a certain extent,which is of great significance.

关 键 词：介质超透镜 几何相位 多波长可见光 色散控制 消色差 

分 类 号：TB34[一般工业技术—材料科学与工程]