Abstract
Generalized cylindrical vector beams (GCVB) are spatially polarization inhomogeneous. It could be considered as a combination of a radially polarized beam and an azimuthally polarized beam with different weighting factors. Here, we report a holographic metasurface patterned on a gold film layer for generating a GCVB. The nanostructure is a superposition of an individually oriented nanoslit array that determines the polarization distribution of the GCVB and a binary fork hologram that eliminates the additional Pancharatnam–Berry phase resulted from the circularly polarized incident plane beam. The behavior of a single nanoslit with specific parameters as a nanopolarizer and that of the overall holographic metasurface when illuminated by a circularly polarized plane beam are simulated and verified. A GCVB with plane wavefront and doughnut-shaped intensity distribution is experimentally produced using this holographic metasurface. The polarization state of the GCVB is also detected and confirmed.
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