▎ 摘　　要

The numerical study of surface plasmon polaritons in a chiroplasma-graphene planar structure is presented. The Kobo formulism is utilized for modeling of graphene's conductivity, and certain type of boundary conditions is employed to obtain the dispersion relation for the proposed waveguide structure. The electromagnetic wave theory is used to solve the numerical problem. The effective mode index is studied for the different values of chiroplasma features (i.e., plasma frequency, cyclotron frequency, and chirality are studied in a certain frequency region). It is concluded that chirality has strong influence on attenuation phase constant against incident wave frequency. Furthermore, the normalized field distributions of the graphene medium are also presented for the proposed waveguide. Graphene layer offers additional degree of freedom as compared to conventional plasmonic materials to fabricate the compact nanophotonic circuits.