Tunable SPPs in graphene-based cylindrical structures with gyroelectric layers

In this paper, we analytically study Surface Plasmon Polaritons (SPPs) in graphene-based cylindrical structures with gyroelectric layers. In the general waveguide, each graphene layer is surrounded by two various gyro-electric materials. New closed-form relations are derived for the field contributions of SPP waves. As a special case, a gyro-electric cylindrical waveguide with double-layer graphene is considered in this article. For the designed structure, the figure of merit (FOM) of 51 is reported for B= 2 T and μc= 0.7 eV, at the frequency of 33 THz. It is demonstrated that the FOM of the studied waveguide is varied by tuning the chemical potential and the magnetic bias. Harnessing the gyro-electric media together with graphene layers will open a new promising platform for the design and fabrication of novel plasmonic devices in the mid-infrared region. •A new analytical model has been suggested for graphene-based cylindrical structures with gyro-electric layers.•The general structure supports tunable SPPs with adjustable properties by varying the chemical potential andmagnetic bias.•A good agreement is seen between simulation and analytical results, which confirms the high accuracy of the model.•A novel graphene-based cylindrical structure with a gyro-electric substratehas been investigated.