Dual-Helicity Decoupled Coding Metasurface for Independent Spin-to-Orbital Angular Momentum Conversion

Controlling the conversion of light's spin angular momentum to orbital angular momentum (OAM) is crucial for applications, including optical systems and wireless communication. In this regard, metasurfaces are often limited by the difficulty of producing independent spin-to-OAM conversions. This study uses a reflective, dual-helicity decoupled coding metasurface to realize completely independent control of OAM vortices for two orthogonal helicities, achieving a free combination of distinctive OAM topological charges, arbitrary helicity, anomalous scattering, and complex spatial beam editing. These results could help to integrate versatile functionalities for advanced compact systems.