Cascaded metasurface for polarization-dependent varifocal vortex beam manipulation.

ABSTRACT: Vortex beams, characterized by orbital angular momentum (OAM), hold significant potential in optical communications, quantum information processing, and optical manipulation. However, existing metasurface designs are largely confined to single-degree-of-freedom control, such as static OAM generation or fixed focal points, which limiting their ability to integrate polarization multiplexing with dynamic focal tuning. To address this challenge, we propose a tunable multifunctional cascaded metasurface that synergizes polarization-sensitive phase engineering with interlayer rotational coupling, overcoming conventional device limitations. The designed metasurface independently generates distinct OAM states in orthogonal circular polarization channels under right-handed circularly polarized (RCP

SUBMITTER: Xu W 

PROVIDER: S-EPMC12397744 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature