The Tranmission Properties Analysis Of A Hybrid Plasmonic Waveguide

Surface plasmon polaritons (SPPs) is bounded in metal-dielectric interface, and it propagates along the metal-dielectric interface. As the propagation distance increases, the amplitude of the SPPs continuously decays exponentially. The power can be highly localized in the metal-dielectric interface with the help of SPPs, and SPPs waveguide overcomes the diffraction limit in the conventional waveguide. These advantages make surface plasmonic optical waveguide attracting much attention in integrated photonics. Two hybrid plasmonic waveguide structures are designed based on the surface plasmon polaritons theory.This dissertation first presents the surface plasmon polaritons theory, then analyzes the property of SPPs on a single interface between metal-dielectric, and at last two hybrid plasmonic waveguide structures are proposed. The loss owing to the metal heat absorption greatly influences SPPs transmission performance in the surface plasmonic waveguide. On the basis of surface plasmon polaritons amplification theory, gain medium is doped in the waveguide in order to compensate the propagation loss of SPPs in the waveguide, and amplify the surface plasma wave.Hybrid surface plasmonic waveguide offers unique advantages such as large field enhancement of SPPs, strong light-matter interaction, relatively long propagation distance, and low propagation loss. Totally, these advantages make hybrid plasmonic waveguide occupying an important position in novel integrated nanophotonics components. The gain medium is one of the methods in compensating SPPs propagation loss in the surface plasmonic waveguide. Furthermore, the gain medium is able to enlarge the surface plasma wave to increase the propagation distance.The loss and propagation power can be obtained by adjusting the parameters of waveguide and the performance of SPPs is obviously improved. The simulation results show that under the condition of gain medium doped in waveguide, the propagation loss compensation of SPPs is enhanced significantly and the SPPs is amplified. Therefore, the introduction of gain medium improves the transmission properties of hybrid plasmonic waveguide structures effectively.