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Generation of optical toroidal vortex with circular asymmetric gratings

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arXiv:2404.11921v1 Announce Type: new
Abstract: Toroidal vortex, a topological structure commonly observed in nature, exist in various types such as bubbles produced by dolphins and the air flow surrounding a flying dandelion. A toroidal vortex corresponds to a spatiotemporal wave packet in the shape of a donut that propagates in the direction perpendicular to the plane of the ring. In this work, we propose a circular asymmetric grating to generate vortex rings. A cylindrical vector wave packet is transformed by the device into a transmitted toroidal vortex pulse. Such a compact toroidal vortex generator may find applications in optical topology research and high-dimensional optical communications.

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