Iranian Journal of Physics Research

Tunable surface polaritons of one-dimensional photonic crystal containing graphen-based hyperbolic metamaterials

Document Type : Original Article

Authors

A Madani
R Abdi-Ghaleh
J Poursamad

Department of Photonics, Laser and Optical Engineering, University of Bonab, Bonab, Iran

https://doi.org/10.47176/ijpr.19.4.36941
Abstract
In this paper, surface polaritons (SPs) at the interface of a semi-infinite homogeneous dielectric medium and a one-dimensional photonic crystal (PC) have been investigated theoretically. The PC is made of the alternate layers of an isotropic ordinary dielectric and a graphene-based hyperbolic metamaterial layers. The effective medium approach has been used for the study of the metamaterial layers and it is shown that they have hyperbolic dispersion in a certain frequency range at THz region. The obtained results show that the structure has some photonic band gaps in the hyperbolic and elliptical frequency regions for both TE and TM polarizations and can support the SPs in these frequency ranges. It is observed that the characteristics of the SPs depend on the geometrical parameters of the structure and optical parameters of the graphene monolayers. In the following, the electromagnetic field profiles of some SPs have been plotted and it is shown that the modes of the first band gap are more localized than the modes of the second band gap. Finally, the intensity distribution of a TM-polarized Gaussian beam inside and outside the PC has been simulated which is verifying the localization of the SPs at the interface of the structure.
 

Keywords

surface polaritons
graphene-based hyperbolic metamaterial
photonic crystal
tunable
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