Convenient dual optical bistability in a cavity-free structure based on nonlinear graphene-plasmonic nanoparticle composite thin layers

Abstract

In this paper, dual optical bistability in a sandwich structure including graphene monolayers, dielectric layers, and a composite of golden plasmonic nanoparticles layers is proposed and studied. The theoretical and numerical results show that the asymmetric sandwich structure offers suitable dual optical bistability in THz range. Moreover, wide dual optical bistability behavior can be achieved via inserting plasmonic nanoparticle composite as two sided layers in the multilayer graphene structure, in which the said composite counterbalances the reduced graphene nonlinearities at higher frequencies. Therefore, we can have appropriate optical bistability in the favorable THz frequency range. The results provide using multilayer graphene structures for future all-optical bistability-based, low-power, and tunable optical devices in all-optical communication technology.