The Property Reaserch Of Surface Plasmon Waveguide

With the development of information technology, the integraty requirement of circuit has become higher and higher and new solid-state quantum devices are in urgent need. As hybrid surface plasmon waveguide can break the diffraction limit and achieve long distance transmission, it has been widely applied in miniaturization and integration of optical device.In this paper, the basic concepts of the Surface Plasmon Plariton (SPP) waveguides and finite element methods (FEM) are introduced, as well as the basic setup of FEM software COMSOL Multiphysics. The basic performance parameters, such as the effective refractive index neff, propagation distance Lp, effective mode area Aeff and energy restriction factor Γ, are carefully studied.Next, we studied the Nanowire-Substrate (N-S) SPP waveguide and presented a brief introduction of metamaterials and effective medium theory (EMT). The hybrid plasmon waveguides, respectively, with metamaterial substrate (Ag-SiO2) and dielectric substrate (SiO2) are investigated and analyzed contrastively with a numerical finite element method by changing the geometry parameters, i.e. the radius R of nanoware and the air gap t. For waveguide with metamaterial substrate, propagation length increases to several tens of microns and effective mode area is reduced reduces by more than3 times. Moreover, the near field region is expanded, leading to potential applications in nanophotonics. Therefore, it could be very helpful for improving the integration density in optical chips and developing functional components on a nanometer scale for all optical integrated circuits.Then we studied the interaction between quantum dots and SPP waveguide, including plasmonic decay rate ypi, spontaneous emission β factor (or coupling efficiency) and so on. This paper highlighted the coupling of quantum dots and V-groove slot waveguide. The dielectric constant of packing medium have an impact on β factor and helps to improve luminous efficiency.Finally, we studied the SPP golden circle structure, including nano-torus, nano-ring and their dimer structures. and the main paremeter is extinction cross section. For quantitative analysis, we calculated the FWHM, Quality factor Q, effective mode volume Veff and Purcell factor Fp at resonance wavelength. Among four sturctures, dimer nano-ring had the narrowest FWHM and the least Veff, implying its potential applications in nanophotonics.