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2020-05-14
Computational Analysis of Graphene-Based Periodic Structures via a Three-Dimensional Field-Flux Eigenmode Finite Element Formulation
By
Progress In Electromagnetics Research M, Vol. 92, 157-167, 2020
Abstract
We present a three-dimensional finite element (FEM) field-flux eigenmode formulation, able to provide accurate modeling of the propagation characteristics of periodic structures featuring graphene. The proposed formulation leads to a linear eigenmode problem, where the effective refractive index is an unknown eigenvalue; the electric field intensity and magnetic flux density are the state variables; and graphene's contribution is efficiently incorporated via a finite conductivity boundary condition. The FEM formulation is spurious-mode free and capable of providing accurate dispersion diagrams and field distributions for arbitrary propagation directions, as opposed toother analytical or numerical approaches, while also efficiently dealing with graphene's dispersive nature. The novelty of the presented approximation is substantiated by computational results for structures incorporating graphene of random periodicity, both within passbands and bandgap frequencies.
Citation
Vasilis Salonikios Michalis Nitas Savvas Raptis Traianos V. Yioultsis , "Computational Analysis of Graphene-Based Periodic Structures via a Three-Dimensional Field-Flux Eigenmode Finite Element Formulation," Progress In Electromagnetics Research M, Vol. 92, 157-167, 2020.
doi:10.2528/PIERM20010302
http://www.jpier.org/PIERM/pier.php?paper=20010302
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