超临界透镜的超衍射极限光场调控研究进展(特邀)  

Advances in the Sub-diffraction Limited Light Modulation by Supercritical Lens(Invited)

作　　者：郑怡茵 秦飞(指导) 李向平 ZHENG Yiyin;QIN Fei;LI Xiangping(Key Laboratory of Fiber Optic Sensing and Communication in Guangdong Province,Institute of Photonic Technology,Jinan University,Guangzhou 511443,China)

机构地区：[1]暨南大学光子技术研究院,广东省光纤传感与通信重点实验室,广州511443

出　　处：《光子学报》2022年第5期166-178,共13页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62075085);国家重点研发计划(No.2021YFB2802000);广州市基础与应用基础研究(No.202002030258)。

摘　　要：与传统体材料光学透镜相比,平面衍射透镜具有加工制备容易、体积轻薄、便于集成等显著优势。同时,基于衍射效应的光学聚焦机制也为实现灵活的光场调控提供了便利。近年来,在光学超振荡理论的指引下,基于平面透镜的远场超衍射极限光场调控及其应用得到人们的广泛关注。超临界透镜在实现超衍射极限聚焦的同时能有效控制聚焦旁瓣和焦深,成为平面超衍射透镜的重要研究方向之一。本文总结了平面超临界透镜近年来的研究进展,简要概述了超临界透镜的原理和设计方法,对构建超临界透镜的几种光场调控类型及其应用进行了介绍,最后对该领域的未来发展作了展望。Compare with conventional refractive-type optical lens,planar diffraction lens has shown significant advantages in terms of reduced volume,light weight,facile fabrication,and easy to integration,etc.The traditional planar diffractive lens,for instance Fresnel zone plate,usually focuses light into an Airy spot with the lateral size of 0.61λ/NA,which is known as Rayleigh Criterion.Squeezing the focal spot beyond Rayleigh criterion will bring more benefits for practical applications.Different from the refractive type optical lens,planar diffraction lens provides a higher degree of freedom for the light field modulation,the lateral size of the focal spot can be customized by optimizing the structural parameters.Optical superoscillation refers to the phenomenon in which a band limited function can be oscillated much faster than the fastest Fourier components in the focal region through delicately control the interference effect,then a subdiffraction limited focal spot will be obtained in the focal plane.Under the guidance of the optical superoscillation theory,planar diffractive lenses with sub-diffraction limited light modulation property in free space attract extensive attention in recent year.As its typical representatives,supercritical lens becomes one of the hot topics in the research field of planar metalenses,owing to its capability of effective balancing the lateral size and focusing efficiency of the sub-diffraction limited focal spot.To date,several different kinds of configurations are usually used to construct the supercritical lens,including photo sieves,metasurfaces,etc.Nevertheless,the zone plates type with concentric phase or amplitude belts is still the favorite configuration for the construction of supercritical lens.The super-oscillation condition in the focal plane could be accomplished through the optimization of the width and radial position of each zone belt.To acquire the insightful meaning in physical level about the constructive and destructive interference process,optimization-free algorith

关 键 词：衍射光学 光场调控 超临界透镜 超衍射极限聚焦 超分辨成像 

分 类 号：TB39[一般工业技术—材料科学与工程]