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- W4366588978 abstract "Fork-shaped gratings are periodic structures containing a spatial dislocation known to be used for the production of optical vortices in a far field. Spatial overlapping of diffraction orders in a near field results in complex spatial evolution of optical vortices. In this paper, we report the results of near-field diffraction on fork-shaped gratings with different topological charges and analyze the evolution of specific optical vortices during propagation. Optical vortices have been shown to form two-dimensional well-ordered spatial configurations in specific transverse planes. The locus of points of optical singularities has been shown to form two helical lines twisted around the ±1 diffraction order directions. Our results demonstrate that the spatial behaviour of optical vortices is in close connection with the spatial ordering arising from the Talbot effect. The quantity of optical vortices demonstrates complex spatial dynamics, which includes spatial oscillations and decreasing along the propagation direction. These results provide a foundation towards a deeper understanding of near-field singular optics phenomena." @default.
- W4366588978 created "2023-04-23" @default.
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- W4366588978 date "2023-04-20" @default.
- W4366588978 modified "2023-10-01" @default.
- W4366588978 title "Near-Field Evolution of Optical Vortices and Their Spatial Ordering behind a Fork-Shaped Grating" @default.
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- W4366588978 doi "https://doi.org/10.3390/photonics10040469" @default.
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