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Metasurface holograms are novel optical elements with enormous potential because of the charming electromagnetic features, which can manipulate amplitude, phase, polarization state, and other parameters of light field via an elaborately designed subwavelength nanostructure array. Metagratings are extensively researched for controlling the feature of light in diffraction orders. However, a flexible...
Optical vortex beams (VB) have provided a new degree of freedom for carrying optical information due to the unbounded number of orthogonal orbital angular momentum (OAM) channels. Due to the presence of phase singularity, VBs possess a dark zone in the center surrounded by a bright ring whose radius is directly related to the OAM carried by the beam. Here multiplexed generalized vortex beams (GVB)...
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