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

Topological spin structures of light, including the Skyrmion, Meron, and bi-Meron, are intriguing optical phenomena that arise from spin–orbit coupling. They have promising potential applications in nano-metrology, data storage, super-resolved imaging and chiral detection. Aside from the electric pa...

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Autores principales: Meng, Fanfei, Yang, Aiping, Du, Kang, Jia, Fengyang, Lei, Xinrui, Mei, Ting, Du, Luping, Yuan, Xiaocong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9537154/
https://www.ncbi.nlm.nih.gov/pubmed/36202794
http://dx.doi.org/10.1038/s41377-022-00970-x
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author Meng, Fanfei
Yang, Aiping
Du, Kang
Jia, Fengyang
Lei, Xinrui
Mei, Ting
Du, Luping
Yuan, Xiaocong
author_facet Meng, Fanfei
Yang, Aiping
Du, Kang
Jia, Fengyang
Lei, Xinrui
Mei, Ting
Du, Luping
Yuan, Xiaocong
author_sort Meng, Fanfei
collection PubMed
description Topological spin structures of light, including the Skyrmion, Meron, and bi-Meron, are intriguing optical phenomena that arise from spin–orbit coupling. They have promising potential applications in nano-metrology, data storage, super-resolved imaging and chiral detection. Aside 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 field. However, their observation and measurement remains absent and faces difficult challenges. Here, we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic fields. The probe is composed of an Ag-core and Si-shell nanosphere, which manifests as a pure magnetic dipole with no electric response. The effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector beams. It was subsequently employed to measure the magnetic topological spin structures, including individual Skyrmions and Meron/Skyrmion lattices for the first time. The proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.
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spelling pubmed-95371542022-10-08 Measuring the magnetic topological spin structure of light using an anapole probe Meng, Fanfei Yang, Aiping Du, Kang Jia, Fengyang Lei, Xinrui Mei, Ting Du, Luping Yuan, Xiaocong Light Sci Appl Article Topological spin structures of light, including the Skyrmion, Meron, and bi-Meron, are intriguing optical phenomena that arise from spin–orbit coupling. They have promising potential applications in nano-metrology, data storage, super-resolved imaging and chiral detection. Aside 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 field. However, their observation and measurement remains absent and faces difficult challenges. Here, we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic fields. The probe is composed of an Ag-core and Si-shell nanosphere, which manifests as a pure magnetic dipole with no electric response. The effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector beams. It was subsequently employed to measure the magnetic topological spin structures, including individual Skyrmions and Meron/Skyrmion lattices for the first time. The proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics. Nature Publishing Group UK 2022-10-06 /pmc/articles/PMC9537154/ /pubmed/36202794 http://dx.doi.org/10.1038/s41377-022-00970-x Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Meng, Fanfei
Yang, Aiping
Du, Kang
Jia, Fengyang
Lei, Xinrui
Mei, Ting
Du, Luping
Yuan, Xiaocong
Measuring the magnetic topological spin structure of light using an anapole probe
title Measuring the magnetic topological spin structure of light using an anapole probe
title_full Measuring the magnetic topological spin structure of light using an anapole probe
title_fullStr Measuring the magnetic topological spin structure of light using an anapole probe
title_full_unstemmed Measuring the magnetic topological spin structure of light using an anapole probe
title_short Measuring the magnetic topological spin structure of light using an anapole probe
title_sort measuring the magnetic topological spin structure of light using an anapole probe
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9537154/
https://www.ncbi.nlm.nih.gov/pubmed/36202794
http://dx.doi.org/10.1038/s41377-022-00970-x
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