▎ 摘　　要

The terahertz frequency has potential applications in various devices, and surface plasmons open up a number of promising applications. With the motivation of studying the possibility of hybridization of different surface plasmons, we proposed a waveguide structure with magnetooptical and dielectric layers with an air spacer layer in which a sheet of graphene is inserted between the dielectric and air gap. It is found that at terahertz frequencies, surface magnetoplasmons at the interface of air and magneto-optical material can interact with graphene surface plasmons which leads to the new type of hybrid plasmons. The coupling can be either tuned by external magnetic field, waveguide width, and the Fermi energy of graphene sheet. Our results show that at given values of waveguide parameters, huge enhancement of fields take place at a specific frequency. These findings open up new window to designing new plasmonic devices with desirable properties.