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Modeling the generation of a light spiral by the helical diffractive microaxicon in a three-dimensional model

In this paper, several methods of forming a spiral intensity distribution are mentioned and it is noted that they mainly form a spiral in the far diffraction zone. To form a spiral intensity distribution in the near zone, the authors propose to illuminate a helical diffractive microaxicon. The results of numerical simulation within the limits of strict electromagnetic theory visually confirm that a spiral structure is formed. In this case, the formation is more qualitative and more reliable compared to the illumination of the binary spiral axicon.