Generation of polarization-insensitive perfect vortices by dielectric metasurfaces with diverging or converging axicon phases



Shen, Zhe, Teng, Longyin, Xiang, Zhiyuan, Li, Le, Rui, Yunjie and Shen, Yaochun ORCID: 0000-0002-8915-1993
(2022) Generation of polarization-insensitive perfect vortices by dielectric metasurfaces with diverging or converging axicon phases. Optics and Laser Technology, 155. p. 108409.

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Abstract

Perfect vortex (PV) is a special light field with constant annular light intensity distribution while carrying orbital angular momentum. It has been widely used in the fields of optical communications and particle manipulation. However, conventional methods to produce PVs require a series of complex components, which limit their practical use in miniaturization. Here we designed models of PV generators based on highly efficient polarization-insensitive dielectric metasurfaces and smoothly generated PVs in simulation with arbitrarily polarized incident Gaussian beams. Meanwhile, by adjusting the focal length of the lens and the half fan angle of the axicon, ring-shaped focal spots with different radii could be obtained in the propagation space, rendering the system more flexible. By superimposing the phase functions of the four PVs with different ring radii, the coaxial PVs were smoothly generated in simulation. Furthermore, the multi-channel PVs were obtained in simulation by introducing the linear displacement factors. By employing polarization-insensitive dielectric metasurfaces, we believe that this method of PV generation will stimulate further applications in fields such as optical communications, particle trapping and manipulation.

Item Type: Article
Uncontrolled Keywords: Polarization-insensitive metasurfaces, Perfect Vortex beam, Beam shaping
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 18 Jul 2022 07:47
Last Modified: 30 Jun 2023 01:30
DOI: 10.1016/j.optlastec.2022.108409
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3158790