Design of Graphene Hybrid Dielectric Plasmonic Nano-waveguide with Ultralow Propagation Loss

A graphene hybrid dielectric plasmonic nano-waveguide (GHDPNW) has been proposed to attain excellent propagating efficiency in the mid-infrared (MIR) spectra. Here, the characteristics of the proposed waveguide on the frequency of incident wave, Fermi energy of graphene, the width and thickness of the low-index dielectric and high-index layers are investigated via the technique of finite element. The results illustrate that the proposed waveguide has a normalized mode area of similar to 10(-7), a figure-of-merit over 3000, and a propagation length over 34 mu m by tuning the thickness of the dielectric layers and the graphene Fermi energy, which is a smaller normalized mode area, higher figure-of-merit, and a longer propagation length compared to similar waveguides. Furthermore, investigation of crosstalk between the neighbor geometries demonstrated that the designed waveguide displays a small crosstalk. Owing to these excellent results, the designed structure could be used for nanophotonic integrated circuits.