▎ 摘　　要

A graphene nanoribbon parallel-plate waveguide (GNPPW) in the infrared band is reported. Owing to the large loss, difficulty of control and shortages of traditional metals, graphene has been considered as a novel plasmonic material as the substitute for metals. In this reported work, the relationship between the dispersion characteristics, the propagation loss of the GNPPW's surface plasmon and the filled dielectric into the GNPPW are analysed. The results show that filling dielectric with a large permittivity can improve the confinement of the symmetric mode supported by the GNPPW. Moreover, the transmission distance and dispersion characteristics of the GNPPW under different chemical potentials are analysed. The performance of the waveguide can be effectively controlled by the filling dielectric and external means such as static voltage, achieving easy regulation and control of graphene. This research has some reference values for the production of novel graphene waveguide devices.