Spin-decoupled metasurfaces for polarization-tailored holography

The ability to arbitrarily control the polarization state of holographic images remains crucial in optical information technology. Current metasurface-based holography largely produces fixed polarization outputs, limiting its utility in polarization-encoded applications. Here, we present a spin-decoupled metasurface that enables programmable polarization tailoring of holographic outputs through independent phase control of circular polarization channels. By engineering specific phase differences between left- and right-handed circularly polarized light, we demonstrate holograms whose output polarization can be continuously varied relative to the linear input. As a proof of concept, we fabricate metasurfaces that reconstruct four distinct holographic letters ("M", "E", "T", and "A"), each exhibiting a prescribed output linear polarization shift (0°, 45°, 90°, or 135°) under identical incident polarization. The devices operate across a broad bandwidth (700-1030 nm) and remain functional over a wide incident angular range from -20^∘ to +20^∘, while maintaining high fidelity under variations in input polarization. This approach provides a versatile platform for polarization-engineered holography, opening avenues for dynamic optical encoding, anti-counterfeiting, and secure displays.