Fig. 1: Design principle of the metasurface-based arbitrary 3D perfect vector vortex beams (PVVBs).
From: Monolithic silicon carbide metasurfaces for engineering arbitrary 3D perfect vector vortex beams
a Schematic of the generation of 3D PVVBs with customized 3D intensity trajectories and arbitrary polarization orders in spatially separated parallel channels via a monolithic metasurface. b The two spin-dependent phase profiles imparted by the metasurface for generating two RCP and LCP 3D perfect vortices with different topological charges. c Schematic of the meta-atom of the metasurface. d The intensity (top) and phase (bottom) of the simulated complex cross-polarization transmission coefficients for the 6561 SiC nanopillars. The green dots indicate the location of 16 selected SiC nanopillars. e The SEM images of nanopillar arrays of a fabricated SiC metasurface.
