Measuring the magnetic topological spin structure of light using an anapole probe

作     者：Fanfei Meng Aiping Yang Kang Du Fengyang Jia Xinrui Lei Ting Mei Luping Du Xiaocong Yuan Fanfei Meng;Aiping Yang;Kang Du;Fengyang Jia;Xinrui Lei;Ting Mei;Luping Du;Xiaocong Yuan

作者机构：Nanophotonics Research CentreInstitute of Microscale OptoelectronicsShenzhen University518060 ShenzhenChina MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi'anChina 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2022年第11卷第10期

页      面：2503-2511页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：This work was supported by the Guangdong Major Project of Basic Research No.2020B0301030009 the National Natural Science Foundation of China Grants U1701661,61935013,62075139,61905163,62205217,12174266,12174310,and 12204309 the Leadership of Guangdong Province Program Grant 00201505 Natural Science Foundation of Guangdong Province Grant 2016A030312010 Science and Technology Innovation Commission of Shenzhen Grants RCJC20200714114435063 and JCYJ20200109114018750 Shenzhen Peacock Plan Grants KQTD2015071016560101 and KQTD20170330110444030 China Postdoctoral Science Foundation(Grant No.2019M663048) 

主　　题：field. topological dipole 

摘      要：Topological spin structures of light,including the Skyrmion,Meron,and bi-Meron,are intriguing optical phenomena that arise from spin-orbit *** have promising potential applications in nano-metrology,data storage,super-resolved imaging and chiral *** from the electric part of optical spin,of equal importance is the magnetic part,particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic ***,their observation and measurement remains absent and faces difficult ***,we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic *** probe is composed of an Ag-core and Si-shell nanosphere,which manifests as a pure magnetic dipole with no electric *** effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector *** was subsequently employed to measure the magnetic topological spin structures,including individual Skyrmions and Meron/Skyrmion lattices for the first *** proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.