In this paper, the metasurface is designed based on silicon nitride material that can generate vortex beams at 830nm, and its corresponding performance is also studied. Firstly, the vortex metasurface based on cross-shaped nanopillars is designed with propagation phase. By changing the topological charge and focal length, two types of vortex metasurfacesare designed to produce vortex beams at the same focal length with different topological charges and at the different focal lengths with the same topological charge. Secondly, a double-layer metasurface is further designed with propagation phase for the lower layer and Pancharatnam–Berry phase for the upper layer. Spin-related vortex beams with different focal lengths and topological charges can be generated when left-handed circularly polarized light (LCP) or right-handed circularly polarized light (RCP) is incident on this double-layer metasurface, respectively. This study provides some ideas for the design of vortex metasurfaces in the near infrared.
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