▎ 摘　　要

We present a theoretical approach for a terahertz graphene-based plasmonic waveguide (TGPW) structure. TGPW is combination of two silicon micro-wires located in a SiO2 surroundings on both sides of graphene layers where each one supports two independent propagating surface plasmon polariton waves on both surfaces. It also investigates properties of TGPW and how sub-terahertz frequency impact them. In this structure, we employed two graphene plates and a silver layer. The results show that the structure under study can confine light in the wavelength ranging from lambda = 300 mu m to lambda = 3000 mu m with a propagation length ranging from 0.5 to 8.2 mu m. The highly compact configuration can be chiefly applicable in areas such as trapping optical force, transporting biomolecules and also in high-density integrated circuits.