Efficient generation of vectorial terahertz beams using surface-wave excited metasurfaces

作     者：Zhuo Wang Weikang Pan Yu He Zhiyan Zhu Xiangyu Jin Muhan Liu Shaojie Ma Qiong He Shulin Sun Lei Zhou Zhuo Wang;Weikang Pan;Yu He;Zhiyan Zhu;Xiangyu Jin;Muhan Liu;Shaojie Ma;Qiong He;Shulin Sun;Lei Zhou

作者机构：State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Fudan UniversityShanghai 200433China Shanghai Engineering Research Centre of Ultra Precision Optical ManufacturingDepartment of Optical Science and EngineeringSchool of Information Science and TechnologyFudan UniversityShanghai 200433China Shanghai Key Laboratory of Metasurfaces for Light ManipulationShanghai 200433China Yiwu Research Institute of Fudan UniversityChengbei RoadYiwu City 322000China. 

出 版 物：《Opto-Electronic Science》 (光电科学(英文))

年 卷 期：2025年第4卷第1期

页      面：1-11页

学科分类：070207[理学-光学] 07[理学] 0702[理学-物理学] 

基　　金：the financial support from National Natural Science Foundation of China (Nos. 62192771, 12374344, 12221004) National Key Research and Development Program of China (2022YFA1204700, 2020YFA0710100) Natural Science Foundation of Shanghai (Grant No. 23dz2260100) China Postdoctoral Science Foundation 2021TQ0077 

主　　题：surface waves vector beam multi-pixel metasurface terahertz ultrathin and high-efficiency 

摘      要：On-chip devices for generating pre-designed vectorial optical fields(VOFs)under surface wave(SW)excitations are highly desired in integrated ***,conventional devices are usually of large footprints,low efficiencies,and limited wave-control ***,we present a generic approach to design ultra-compact on-chip devices that can efficiently generate pre-designed VOFs under SW excitations,and experimentally verify the concept in terahertz(THz)*** first describe how to design SW-excitation metasurfaces for generating circularly polarized complex beams,and experimentally demonstrate two meta-devices to realize directional emission and focusing of THz waves with oppo-site circular polarizations,*** then establish a systematic approach to construct an integrated device via merging two carefully designed metasurfaces,which,under SW excitations,can separately produce pre-designed far-field patterns with different circular polarizations and generate target VOF based on their *** a proof of con-cept,we demonstrate experimentally a meta-device that can generate a radially polarized Bessel beam under SW excita-tion at~0.4 *** results agree well with full-wave simulations,collectively verifying the performance of our *** study paves the road to realizing highly integrated on-chip functional THz devices,which may find many ap-plications in biological sensing,communications,displays,image multiplexing,and beyond.