Perovskite nanowires-based graphene plasmonic waveguides with low loss and low gain threshold

We designed a perovskite nanowire-based graphene plasmonic waveguide, where the perovskite nanowire is located on the graphene-insulator-metal (GIM) platform. The finite element method is employed to investigate the impact of the perovskite nanowire radius, graphene layer thickness, Fermi energy level of the graphene, thickness of the low index dielectric layer, and permittivity of dielectric layer on the mode properties. The results indicate that the hybrid mode exhibits very low propagating loss and ultra-high figure of merit. Besides, when the radius of the perovskite nanowire exceeds 200 nm, an ultra-low gain threshold below 0.1 μm−1 could be achieved. Our findings could have potential applications in plasmonic waveguide-based devices, such as lasers, modulators, sensors, etc.