Moire meta-device for flexibly controlled Bessel beam generation  

作　　者：GUOCUI WANG TIAN ZHOU JIANZHOU HUANG XINKE WANG BIN HU YAN ZHANG 

机构地区：[1]Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [2]Beijing Key Laboratory of Metamaterials and Devices,Key Laboratory of Terahertz Optoelectronics,Ministry of Education,Beijing Advanced Innovation Center for Imaging Theory and Technology,Department of Physics,Capital Normal University,Beijing 100048,China

出　　处：《Photonics Research》2023年第1期100-108,共9页光子学研究（英文版）

基　　金：Capacity Building for Science and Technology Innovation-Fundamental Scientific Research Funds(00820531120017);Sino-German Mobility Program of the Sino-German Center for Science Funding(M-0225);Beijing Talents Project(2018A19);National Key Research and Development Program of China(2019YFC1711905);National Natural Science Foundation of China(61875010,11874132,1174243,11774246)。

摘　　要：High-order Bessel beams are of great interest for most stable long-range optical quantum communications due to their unique nondiffraction,self-healing,and orbital angular-momentum-carrying capabilities.Until now,metasurfaces based on Bessel beam generators are mostly static and focused on generating zero-order Bessel beams.A moirémeta-device made of two cascaded metasurfaces is a simple,effective strategy to dynamically manipulate the wavefront of electromagnetic(EM)waves by mutual rotation between the two metasurfaces.Here,an all-dielectric moirémeta-device integrated with the functions of an axicon and a spiral phase plate to generate terahertz Bessel beams is designed.Not only the order,but also the nondiffraction length of the generated Bessel beam can be continuously tuned.As a proof of concept of the feasibility of the platform,the case of tuning order is experimentally demonstrated.The experimental results are in good agreement with the theoretical expectations.In addition,we also numerically proved that the nondiffraction length of the Bessel beam can be adjusted with the same approach.The moirémeta-device platform is powerful in dynamically manipulating the wavefront of EM waves and provides an effective strategy for continuously controlling the properties of the Bessel beam,which may find applications in optical communications,particle manipulation,and super-resolution imaging.

关 键 词：BESSEL BEAM continuously 

分 类 号：O436[机械工程—光学工程]