Completely spin-decoupled geometric phase of a metasurface

作     者：XINMIN FU JIE YANG JIAFU WANG YAJUAN HAN CHANG DING TIANSHUO QIU BINGYUE QU LEI LI YONGFENG LI SHAOBO QU XINMIN FU;JIE YANG;JIAFU WANG;YAJUAN HAN;CHANG DING;TIANSHUO QIU;BINGYUE QU;LEI LI;YONGFENG LI;SHAOBO QU

作者机构：Shaanxi Key Laboratory of Artificially-Structured Functional Materials and DevicesAir Force Engineering UniversityXi’an 710051China School of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China 

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

年 卷 期：2023年第11卷第7期

页      面：1162-1174页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：Young Talent Fund of Association for Science and Technology in Shaanxi (20220102) National Natural Science Foundation of China (61971435,62101588) 

主　　题：geometric opposite surface 

摘      要：Metasurfaces have provided an unprecedented degree of freedom(DOF)in the manipulation of electromagnetic waves.A geometric phase can be readily obtained by rotating the meta-atoms of a ***,such geometric phases are usually spin-coupled,with the same magnitude but opposite signs for left-and right-handed circularly polarized(LCP and RCP)*** achieve independent control of LCP and RCP waves,it is crucial to obtain spin-decoupled geometric *** this paper,we propose to obtain completely spin-decoupled geometric phases by engineering the surface current paths on *** on the rotational Doppler effect,the rotation manner is first analyzed,and it is found that the generation of a geometric phase lies in the rotation of the surface current paths on *** the induced surface current paths under the LCP and RCP waves always start oppositely and are mirror-symmetrical with each other,it is natural that the geometric phases have the same magnitude and opposite signs when the meta-atoms are *** obtain spin-decoupled geometric phases,the induced surface current under one spin should be rotated by one angle while the current under the other spin is rotated by a different *** this way,LCP and RCP waves can acquire different geometric phase ***-of-principle prototypes were designed,fabricated,and *** the simulation and experiment results verify spin-decoupled geometric *** work provides a robust means to obtain a spindependent geometric phase and can be readily extended to higher frequency bands such as the terahertz,IR,and optical regimes.