Period fold structure of graphene SPP waveguide

The field of plasmonics has experience a renaissance in recent years by providing a large variety of new physical effects and applications. Surface plasmon polaritons (SPPs), i.e. the collective electron oscillations at the interface of a metal/dielectric, may bridge the gap between electronic and photonic devices, provided a fast switching mechanism is identified. Here, we design folds graphene waveguide excited SPPs and full compensation structures with periodic array by graphene material. Theoretically, we analyzed the loss of the way by periodic array gain full compensation is analyzed. By the results of theoretically analysis, we discover period fold structure not only excites SPPs, which also we can control device parameters using SPPs wave relations. In addition, periodic array compensation can significantly increase the propagation distance of SPPs. Simulation results we further find by simulation results: structure of our design has the advantage of strong localized and subwavelength waveguide size; periodic array compensation can significantly improve the electric field strength of nanocavity; structure of graphene waveguide expresses high levels of population inversion and low spontaneous emission noise disturbance. The graphene waveguide devices which we design can be the key device for the micro-nano optics, photonic sensing and measurement.