Analytical Study of Surface Plasmon-Phonon Polaritons in Nonlinear-Graphene-LiF Heterostructures in the far-infrared region

Abstract

In this paper, a new heterostructure based on the hybridization of graphene-LiF layers with a nonlinear material is introduced and studied. The numerical results are depicted and discussed in detail. A high value of FOM (FOM=24.5) at the frequency of 9.22 THz is reported for the chemical potential of 0.2 ev. Our results show that the propagation features of the proposed structure can be varied by the graphene parameters and the nonlinearity inside and outside the phononic band. The Hybridization of graphene with a nonlinear medium and a polar dielectric like LiF can support high levels of confinement with low optical loss, which makes this platform a unique candidate for THz applications.