TM surface plasmon - polaritons in structure of vacuum - graphene – dielectric - metal

It takes a keen interest in nanostructures based on graphene now. Graphene properties are very attractive in terms of its possible use application as the basis for new nanomaterials with improved electrical, thermal and... [ view full abstract ]

It takes a keen interest in nanostructures based on graphene now. Graphene properties are very attractive in terms of its possible use application as the basis for new nanomaterials with improved electrical, thermal and mechanical characteristics, as well as an element of nanoelectronic information processing devices [1].

We present the results of simulation of the propagation of surface plasmon polaritons in structure of vacuum - graphene - dielectric - metal. SiO2 was selected as dielectric, gold (Au) was selected as the metal. Structure properties are defined by dielectric constant, its thickness and conductivity of graphene. Theoretical methods of macroscopic electrodynamics is used. The calculations were performed in the terahertz range from 0.1 to 1 THz.
Dispersion equations and conditions of existence of the TM wave of the structure were obtained on the basis of Maxwell's equations solutions. The behavior of the propagation constants and attenuation for different thicknesses of the dielectric layer and at different chemical potentials of graphene is investigated. Distinction of plasmon propagation modes depending on the chemical potential of graphene dielectric layer thickness at different frequencies is shown. Energy and magnetic moment distributions (inverse Faraday effect) generated by plasmon modes of the structure is obtained. It is shown that the maximum value of the magnetic moment is observed at the boundary vacuum - graphene - dielectric and decreases exponentially to a minimum in the dielectric and vacuum.

This work was supported in part by RFBR (grants ## 16-37-00023, 16-07-00751, 16-29-14045) and RScF (grant # 14-22-00279).
1. K. S. Novoselov, et al. Nature 490, 192–200 (2012)