Geometric metasurface for polarization synthesis and multidimensional multiplexing of terahertz converged vortices

作     者：YANG ZHU BINBIN LU ZHIYUAN FAN FUYONG YUE XIAOFEI ZANG ALEXEI V.BALAKIN ALEXANDER P.SHKURINOV YIMING ZHU SONGLIN ZHUANG 

作者机构：Terahertz Technology Innovation Research InstituteTerahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and TechnologyTongji UniversityShanghai 200092China Department of PhysicsLomonosov Moscow State UniversityMoscow 119991Russia 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第6期

页      面：1517-1532页

核心收录：

学科分类：070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(2017YFA0701005) National Natural Science Foundation of China(61722111,61871268) "Shuguang"Program of Shanghai Education Commission(19SG44) Program of General Administration of Customs of the People’s Republic of China(2019HK006) Shanghai International Joint Laboratory Project(17590750300) 111 Project(D18014) Interdisciplinary Scientific and Educational School of Moscow University"Photonic and Quantum Technologies.Digital Medicine" 

主　　题：converge helical twisted 

摘      要：The investigation of converged twisted beams with a helical phase structure has a remarkable impact on both fundamental physics and practical *** metasurfaces consisting of individually orientated metal/dielectric meta-atoms provide an ultracompact platform for generating converged ***,it is still challenging to simultaneously focus left-handed and right-handed circularly polarized incident beams with pure geometric phase modulation,which hinders the independent operation on topological charges between these two helical *** we propose and experimentally demonstrate an approach to design terahertz geometric metasurfaces that can generate helicity-independent converged vortices with homogeneous polarization states by the superposition of two orthogonal helical vortices with identical topological ***,the multiplexing of polarization-rotatable multiple vortices in multiple dimensions,i.e.,in both longitudinal and transverse directions,and a vortex with an extended focal depth is confirmed by embedding polarization modulation into the geometric *** demonstrated approach provides a new way to simultaneously manipulate orthogonal helical components and expand the design dimension,enabling new applications of geometric metasurface devices in polarization optics,twisted-beam related image and edge detection,high capacity optical communication,and quantum information processing,to name a few.