TE-Polarized Surface Plasmon Polaritons (SPPs) in Nonlinear Multi-layer Graphene-Based Waveguides: An Analytical Model

TL;DR

This paper develops an analytical model for TE-polarized surface plasmon polaritons in nonlinear multi-layer graphene waveguides, revealing adjustable propagation properties and potential for innovative THz device design.

Contribution

It introduces a new analytical model for TE SPPs in nonlinear multi-layer graphene waveguides, including two novel structures and their tunable properties.

Findings

Effective index up to 82 at 61 THz

Propagation properties adjustable via chemical potential and nonlinear coefficients

Potential for designing innovative THz devices

Abstract

In this article, an analytical model is proposed for the study of Transverse-electric (TE) surface plasmon polaritons (SPPs) in nonlinear multi-layer graphene-based waveguides. Each graphene sheet has been located between two different Kerr-type layers. As special cases of the general, proposed structure, two new nonlinear graphene-based waveguides are introduced and investigated in this paper. The obtained results show that the propagation properties of these exemplary structures are adjustable via chemical potential and nonlinear coefficients. A large value of the effective index, i.e. neff=82 is obtained for the chemical potential of 0.15 ev and the nonlinear ratio of 0.8 for the second structure at the frequency of 61 THz. The presented study suggests a novel platform in graphene plasmonics, which can be used for the design of innovative THz devices.