Study On The Property And Application Of Mid-infared Graphene Plasmonic Waveguides

Graphene is a two-dimensional crystallineform of carbon atoms arranged in a hexagonal lattice. And it is just a single atomic layer thickness. Graphene is not only the thinnest material but also the strongest material whose strength is 200 times than the best steel. Moreover graphene has excellent electrical conductivity, ultra-high electron mobility and low resistance, which is the smallest resistivity material in the world. In terms of thermal, graphene has extremely high thermal conductivity, which is much higher than normal carbon nanotubes and diamond. In optical aspect, graphene has a transmittance of up to 97%. The saturable absorption characteristics is another advance of graphene, so that it can be used to achieve full-band mode-locked in fiber laser technology.Compared with traditional metals, the surface plasmonic polaritons supported by graphenein mid-infrared has following advantages: Firstly, graphene can cover the longwave band to support the surface plasmonic polaritions, while traditional metals can support only from the visible to near-infrared. Then, graphene can localize the surface plasmonic polaritons stronger. So it can be used to reach the deep-integration. Finally, the optical properties of graphene is relative with the carrier concentration of graphene. As a result the plasmonic wave supported by graphene is tunable.The main contents of this paper are as follows:Introduce graphene surface plasmonicpolaritons characteristics and review the researches on graphene surface plasmonic polaritons.Based on Maxwell's equations, compared with the traditional surface plasmonic wave, find the root of the advantages of graphene surface plasmonic wave.Introduce several analytical and numerical methods for solving the problem of waveguides. Then, study the dielectric-graphene plasmonic waveguide with these methods to get the distribution of the mode field, dispersion characteristics, tunability, transmission characteristics and so on.Based on the dielectric-graphene plasmonic waveguide, we design an ultra-compactand broadband tunable mid-infrared multimode interferometer.