Theoretical Analysis of Terahertz Dielectric-Loaded Graphene Waveguide

The waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide is investigated based on the effective-index method and the finite element method. Modal properties of the effective mode index, modal loss, and cut-off characteristics of higher order modes are investigated. By modulating the Fermi level, the modal properties of the fundamental mode could be adjusted. The accuracy of the effective-index method is verified by a comparison between the analytical results and numerical simulations. Besides the modal properties, the crosstalk between the adjacent waveguides, which determines the device integration density, is studied. The findings show that the effective-index method is highly valid for analyzing dielectric-loaded graphene plasmon waveguides in the terahertz region and may have potential applications in subwavelength tunable integrated photonic devices.

Automated summary

The study investigates the waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide using effective-index method and finite element method. It examines modal properties such as effective mode index, modal loss, cut-off characteristics of higher order modes, and shows the potential for tuning the fundamental mode by modulating the Fermi level. Additionally, it validates the accuracy of the effective-index method and studies crosstalk between adjacent waveguides for determining device integration density.