Theoretical Research Of Slow-Light Based On Surface Plasmon Polaritons

This dissertation starts from the demand of slow-light technology’s application and the research status of nowadays. Then we introduce its physical principles, implementation techniques and development process. We also make a brief introduction of basic concepts and features of the SPPs. Introduced some methods to analyze the electromagnetic field and focused on the finite element method (FEM) which we used in this study. Using metal Drude model, rationales of surface plasmonics at signal metal-dielectric interface which conclude dispersion relationship, length scales and excitation ways are analyzed. Achieving the following works based on what we have analyzed.1.We design two structures of SPPs waveguide as MIM and IMI based on the pre-work we have done in early research and analysis.We study each three layer planner waveguide, with an analysis of its field distributions and give simulation results between structure parameters, electromagnetic parameters and transmission characteristics that conclude mode effective refraction, propagation loss, propagation length. In the following part, on account of FEM, the dissertation studies SPPs-based waveguide. Under addition excitation, slow light property of this waveguide is studied with a detailed analysis of dispersion relation, group velocity cure and time-domain transmission fields. It is shown that we can get slow light with a pretty low group velocity dispersion (GVD) which means the optical pulse signal is propagated efficiently by choosing appropriate material, working frequency and adjusting the thickness of the middle layer. 2.For the sake of increasing SPPs propagation length and decreasing propagation loss we take graphene as material and design a new type of SPPs waveguide after analysing derived the electromagnetic parameters of graphene.And we get some better properties than classic metal based structures.