Planar Metasurface for Vortex Beam Generating and Converging

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文件名称：Planar Metasurface for Vortex Beam Generating and Converging
文件大小：1.04MB
文件格式：PDF
更新时间：2023-01-21 07:53:19
Metasurface Planar Beam Vortex single-layer transmission-type metasurfaces are proposed to generate a converged vortex beam and vortex beams with different topological charges. A new metasurface design is used to generate the vortex beam, in which the required accumulated phase difference along the propagation path is realized by designing and arranging artificial single-layer unit cells. Furthermore, the converged vortex beam is generated by metasurface that superimposes the phase distribution for the vortex beam and converged beam. The transmitted efficiency of the metalens can reach 20% as designed, which approaches to the efficiency limit of this type of metasurface.