Selective Angular Momentum Generator Based on a Graphene Hybrid Plasmonic Waveguide

Manipulation of the angular momentum (AM) of photons is of great importance in many fields such as optical communications, holographic, and particle manipulation. Although there are many demonstrations focusing on dynamic manipulation of AM in free space, the active tuning of AM in nanophotonic waveguides is mainly exclusive, especially in the Terahertz regime. Here we propose a selected AM generation scheme based on graphene hybrid waveguide, which can convert a quasi-linear mode into a quasi-circular mode with dynamic tuning manner. Also, we show that the proposed waveguide structure can serve as a distinguisher between left- and right-handed quasi-circular modes. These results allow for the dynamic control of AM of light in nanophotonic waveguides, which are crucial for various devices with compact footprint, such as on-chip biosensing and integrated quantum information processing.