High‐Degree‐of‐Freedom Grafted Perfect Vector Vortex Beams Enabled by Diatomic Metasurfaces

ABSTRACT Grafted perfect vector vortex beams (GPVVBs) expand the spatial encoding capacity of structured light by combining multiple degrees of freedom within a single beam. However, the current implementation schemes remain constrained by two critical challenges: intrinsic conjugate loss and limited topological charge combinations. Here, we present a diatomic metasurface platform that directly modulates the polarization‐dependent complex amplitudes of incident light, producing a single on‐axis output beam and eliminating the intrinsic conjugate loss of Pancharatnam–Berry phase designs. To achieve high‐degree‐of‐freedom GPVVBs, we introduce a global phase‐compensation strategy that enforces boundary continuity and admits arbitrary integer, fractional, or hybrid topological charge combinations, substantially enhancing the accessible mode space. As a proof of concept, we fabricate a metasurface array generating parallel‐channel double‐ring GPVVBs and demonstrate secure optical encryption across four independent information channels. This integrated approach combines high efficiency, full programmability of beam scaling, rotation, polarization order, polarization ellipticity, and exceptional scalability of the encoding space. Our results establish phase‐compensated GPVVB metasurfaces as a compact and versatile platform for high‐capacity secure information processing, optical trapping, and other advanced photonic applications.