Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Da Teng, Kai Wang
2021 Nanomaterials  
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
more » ... merical 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.
doi:10.3390/nano11010210 pmid:33467556 fatcat:dsj2f7xoyrhk5b3nup5bkyuixy