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arXiv · 2210.08694

Topological spin defects of light

Haiwen Wang·Charles C. Wojcik·Shanhui Fan
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Abstract

Topological defects are found in a variety of systems, and their existence are robust under perturbations due to their topological nature. Here we introduce a new type of topological defects found in electromagnetic waves: topological spin defects. Such a defect is associated with a point where the electromagnetic spin density is zero, and generically have a nontrivial topological spin texture surrounding the defect point. Due to such spin texture, a topological spin defect possesses a quantized topological charge. We provide examples where isolated defect point, periodic or quasi-periodic defect lattices can be created. Such topological spin defect points may find applications in 3D imaging and nanoparticle manipulation.

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Haiwen Wang, Charles C. Wojcik, Shanhui Fan. 2022-10-17. Topological spin defects of light. https://arxiv.org/abs/2210.08694

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