Spin-decoupled metasurfaces hold significant potential for integrated photonics by enabling independent manipulation of the spin degree of freedom of light. However, achieving robust spin-decoupled performance over both a broad bandwidth and a wide range of incident angles remains a pivotal challenge. In this work, a spin-decoupled strategy incorporating the propagation phase with the geometric phase is implemented to design plasmonic metasurfaces capable of independently controlling wave fronts of orthogonally circularly polarized light in the visible spectrum. Two representative devices demonstrate distinct spin-decoupled functionalities: one generating a vortex beam under left circular polarization (LCP) and the other enabling LCP-selective bifocusing, while both maintain specular reflection under right circular polarization. Systematic experimental characterization using microscopic spectroscopy demonstrates robust spin-decoupled performance across an 80 nm bandwidth and a wide range of incident angles with a scanning range of up to $40\text{μ}\mathrm{m}$. This dual advantage in spectral and angular stability, surpassing typical dielectric counterparts, provides solutions for reliable metasurface devices in applications such as multiplexed optical communications and miniaturized high-resolution imaging.

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• Integrated optics
• Metamaterials
• Metasurfaces
• Topological effects in photonic systems
• Polarization