Graphene-Integrated Plasmonic Structure for Optical Third Harmonic Generation

In this paper, a general recipe is proposed to design an efficient graphene-integrated plasmonic structure for third harmonic generation. Specifically, the design procedure for an integrated graphene-based ultraviolet light generator is presented. In order to enhance the field intensity at the graphene layer, two distinct mechanisms are utilized. A multilayer Bragg structure is used as a perfect magnetic conductor to make a constructive interference between incident and reflected field at the graphene layer. A periodic array of shaped resonant gold nanoparticles is placed on top of the graphene sheet to enhance the field intensity due to the plasmonic resonance at the fundamental frequency. A hybrid and fast numerical method based on the scattering matrix of Floquet modes and the Generalized Multipole Technique is also proposed to analyze the periodic structure. This numerical method is used to optimize the dimensions of the multilayer structure and boost the nonlinear conversion efficiency by more than
$10^6$
times.