Non-interleaved geometric phase metasurfaces for low-crosstalk circular polarization multiplexing

Circular polarization multiplexing offers great potential for enhancing optical information capacity and multifunctional integration, but crosstalk and structural complexity remain key challenges. We present a single-layer, non-interleaved geometric phase metasurface that effectively decouples left- and right-handed circularly polarized (LCP/RCP) channels using only Pancharatnam-Berry (PB) phase modulation. By globally optimizing the in-plane orientation of uniform PB-type anisotropic meta-units with polarization conversion efficiency approaching 99.99%, spin-selective wavefront control is realized without interlaced designs or composite coding. Full-wave simulations confirm distinct holograms ("apple" for LCP, "mango" for RCP), with high fidelity and minimal crosstalk. This nonlocal orientation strategy enables a scalable, fabrication-friendly platform for dual-channel polarization encoding, with applications in optical encryption, holography, and quantum information.