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Simulation of graphene-based plasmonic metamaterial absorbers by using spectral element method

Recently, plasmonic metamaterial absorbers (MMAs) have attracted a surge of interest owing to its perfect performance. Metal-dielectric-metal structures combined with graphene show promising potential in nanoelectronics and nanophotonics applications such as photodetectors and optical modulators. However, the accuracy and efficiency of numerical approaches is a critical aspect of graphene-based nanoscale optoelectronic device design, the prevailing numerical techniques in this area are mainly focused on the classic finite element method (FEM) and the finite-domain time-difference (FDTD) method. In spite of the stability of FEM and FDTD, these methods suffer from a slow convergence attributed to their lower-order approximations. In this paper, a specific boundary-integral spectral element method is developed to simulate the graphene-based MMAs with spectral accuracy. With the fast numerical analysis method, a three-dimensional metal-dielectric-graphene-dielectric-metal nanostructure is proposed and its optical property is investigated.