Fig. 3: Single spin-decoupled metasurface-based PMTs for simultaneous SAM and OAM sorting.

a Schematic of a spin-decoupled metasurface that merges the geometric phase and dynamic phase for simultaneous SAM and OAM sorting via spin-controlled PMTs. Vortex beams with different spins are transformed into focusing patterns on two separated halves of the screen on a transverse focal plane with topological charge-dependent azimuthal rotations. b Eight unit cells of the spin-decoupled metasurface and their corresponding phase modulation around a wavelength of 532 nm. c Perspective-view SEM images of the fabricated spin-decoupled metasurfaces