Research On Properties Of The Surface Plasmonic Photonic Crystal Waveguide

Utilizing the characteristics of local field enhancement and surface transportation of SPPs, the light can be localized in the subwavelength scale, So more and more scientists are concerned about the research of the optical devices which based on the SPPs. Among them, metal-insulator-metal(MIM) waveguide has more simple structure, stronger confinement to light, and hybrid surface plasmonic waveguide has good characteristics of location and longer transmission distances, so the two waveguides have highly potential application in integrated nano photonics components. In this paper, combining the two waveguides with photonic crystal, new waveguides are proposed. Based on the surface plasmon theory, the transmission characteristics of those two waveguides are further studied. The results can provide references for practical application.We first introduces the optical properties of metal, obtain the permittivity dispersive model for metal. Moreover, discusses the dispersion characteristics of surface plasmons, parameters calculation, surface plasmon excitation mode and the numerical analysis method used in this paper.Then we propose a new type of metal-insulator-metal surface plasmonic Bragg waveguide structure, the transmission characteristics and electromagnetic field distribution are analyzed by the finite-difference-time-domain(FDTD) method. On this basis, we construct a Bragg micro-cavity. The influences of the structural parameters on the quality factor and mode volume are discussed. The results can provide theoretical guidance for the design of surface plasmon resonator.A new type metal-photonic crystal hybrid surface plasmonic photonic crystal waveguide structure is proposed, the photon energy can be confined in the line defect and propagates along the metal surface. The structure is analyzed based on finite difference time domain method, the electric field distribution is obtained, and the transmitting length and mode area of the waveguide are analyzed. The Y type beam splitter can be realized based on the waveguide..Finally, a new type of metal-dielectric-photonic crystal surface plasmonic photonic crystal waveguide structure, which a low refractive index dielectric layer is embedded in metal layer and photonic crystal layer, is proposed. The transmission characteristics of this waveguide structure is studied. The results show that metal-dielectric-photonic crystal waveguide have much better locality and much longer transmission length. Meanwhile, the transmission characteristic of the Y type beam splitter and coupler are studied, and the transmittance can be improved according to structure optimization.