Spin-decoupled metasurfaces for tunable and reconfigurable vector beams

We present and experimentally demonstrate a new design recipe for spin-decoupled metaoptics capable of tailoring the propagation dynamics of polarization textures in Bessel-Gaussian vector beams. In contrast to conventional optical elements, these planar devices independently encode distinct phase profiles for the two orthogonal circular-polarization components (left-and right-handed), enabling precise control over the evolution of the resulting vector beam along the propagation axis. The technique allows the direct realization of dynamic effects such as polarization beating, topological charge evolution, and oscillatory local non-separability, opening new possibilities for spatiotemporal field engineering and offering a new versatile platform for structured-light applications in integrated photonics, with potential impact in optical manipulation and information technologies.