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

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

doi:10.1038/s41377-022-00970-x

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

Original Articles

- Measuring the magnetic topological spin structure of light using an anapole probe
- Measuring the magnetic topological spin structure of light using an anapole probe
- LSA 2022年11卷第10期页码：2503-2511
- Affiliations：
  
  1.Nanophotonics Research Centre, Institute of Microscale Optoelectronics, Shenzhen University, 518060, Shenzhen, China
  2.MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xi'an, China
- Author bio：
  
  Luping Du (lpdu@szu.edu.cn)
  Xiaocong Yuan (xcyuan@szu.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00970-x
  中图分类号：
- 纸质出版日期：2022-10-31，
  
  网络出版日期：2022-10-06，
  
  收稿日期：2022-05-07，
  
  修回日期：2022-07-22，
  
  录用日期：2022-08-25
- Accepted：
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Measuring the magnetic topological spin structure of light using an anapole probe[J]. LSA, 2022,11(10):2503-2511.

Meng, F. F. et al. Measuring the magnetic topological spin structure of light using an anapole probe. Light: Science & Applications, 11, 2503-2511 (2022).
Measuring the magnetic topological spin structure of light using an anapole probe[J]. LSA, 2022,11(10):2503-2511. DOI： 10.1038/s41377-022-00970-x.

Meng, F. F. et al. Measuring the magnetic topological spin structure of light using an anapole probe. Light: Science & Applications, 11, 2503-2511 (2022). DOI： 10.1038/s41377-022-00970-x.

摘要

Abstract

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.

关键词

Keywords

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