Topological Approach of Characterizing Optical Skyrmions and Multi-Skyrmions
Topological Approach of Characterizing Optical Skyrmions and Multi-Skyrmions
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表征光学斯格明子和多斯格明子的拓扑方法
DOI：
10.1002/lpor.202300155
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发表时间：
2023
影响因子：
11
通讯作者：
McWilliam A
中科院分区：
文献类型：
--
作者：
McWilliam A
近轴光学Skyrmion的Skyrmion数可以通过它们的偏振奇点和相关的缠绕数来定义，使用利用斯托克斯定理的数学推导。它表明，这个定义提供了一个强大的方法来提取Skyrmion数从实验数据，如所示的各种光学（Néel-型）skyrmion和bimerons和multi-skyrmion。这种方法不仅提高了精度，而且提供了一种直观的几何方法来理解这种光的准粒子的拓扑结构及其对平滑变换的鲁棒性。
The skyrmion number of paraxial optical skyrmions can be defined solely via their polarization singularities and associated winding numbers, using a mathematical derivation that exploits Stokes's theorem. It is demonstrated that this definition provides a robust way to extract the skyrmion number from experimental data, as illustrated for a variety of optical (Néel‐type) skyrmions and bimerons and multi‐skyrmions. This method generates not only an increase in accuracy, but also provides an intuitive geometrical approach to understanding the topology of such quasi‐particles of light and their robustness against smooth transformations.