基于几何相位的线偏振聚焦全介质超透镜的设计  

Design of all-dielectric metalens with linearly polarized focusing based on Pancharatnam-Berry phase

作　　者：王玲玉 宋秋阳 苗玉[1] 高秀敏[1] WANG Lingyu;SONG Qiuyang;MIAO Yu;GAO Xiumin(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2023年第5期53-61,共9页Optical Instruments

基　　金：国家重点研究开发计划(2018YFC1313803)。

摘　　要：超透镜凭借其独特的优势逐渐取代或补充了传统的折光和衍射透镜,从而领先小型化高性能光学设备和系统。这种小型化有望带来紧凑的纳米级光学设备,应用于相机、照明、显示器和可穿戴光学。但在传统的超透镜设计中,几何相位通常需要左右旋圆偏振光的手性限制。为了使其不再局限于左旋圆偏振光(LCP)和右旋圆偏振光(RCP)入射,设计了基于几何相位的全介质超透镜,实现了线偏振光的近场聚焦,其与超表面滤光片主要输出波长(可见光波段)一致。采用有效时域差分法研究并验证了超透镜各变量对光场聚焦特性的影响,超透镜等其他超表面光学元器件前所未有的设计自由度将极大地扩大微光学和集成光学的应用领域。Metalens have gradually replaced or supplemented traditional refractive and diffraction lenses with their unique advantages,leading to further miniaturization of high-performance optical devices and systems.This miniaturization is expected to lead to compact nanoscale optical devices for applications in cameras,lighting,displays,and wearable optics.However,in conventional metalens designs,the Pancharatnam-Berry(PB)phase usually requires the chirality limitation of left and right circularly polarized light.In order to avoid the incident limitation of the linearly polarized light by the left-handed circular polarization(LCP)and right-handed circular polarization(RCP),an all-dielectric metalens based on PB phase was designed to achieve near-field focusing of linearly polarized light.It coincides with the main output wavelength(visible band)of the metasurface filter.The effects of various variables on the focusing properties of the light field were studied and verified by effective time-domain difference simulation in this paper.The unprecedented design freedom of metalens and other metasurface optical components will greatly expand the application fields of micro-optics and integrated optics.

关 键 词：几何相位 全介质超透镜 线偏振光聚焦 

分 类 号：O436.3[机械工程—光学工程]