Sensing Properties Of Surface Plasmon Resonance In Metallic Nanostructures

Surface plasmon resonance (SPP) has been widely used in many areas, such of life, chemistry, materials, photonics and information science, who has made a large number of research results in photonic crystal fiber, biochemical analysis and food safety testing, playing an irreplaceable role in optoelectronic integration. This paper mainly describes the principles and application background of SPR sensor, and has studied the sensing properties of surface plasmon polaritons waveguide with Graded-index ridge and Deep-Subwavelength Nanoresonators waveguide utilizing Extreme Coupling.First, this paper introduces the background and the development status of surface plasmon. At the same time, two hot research waveguide model are introduced and has given three main research methods, which contain Finite Element Method (FEM), Rigorous Coupled-Wave Analysis and Finite Difference Time Domain, at last, FEM is highlighted.Secondly, this paper has introduced the formation of the surface plasmon theory and Drude model theory, and given the formula derivation of dispersion. As the study of this chapter are based on the data given by the Multi-physics simulation software COMSOL Multiphysic, so this section also describes the COMSOL Multiphysic software and its powerful capabilities on solving multi-physics problems.Thirdly, the sensing characteristics of graded-index ridge long-range dielectric-loaded surface plasmon waveguide (LR-DLSPPWs) has been studied. In this part, the transmission length and mode size of surface plasmon oscillation has been researched and been compared with the fixed-index ridge LR-DLSPPWs. We can find that the SPPs’ transmission length can be increased about10%under the condition of the same mode confinement.Finally, the sensing properties of the multilayer metal-dielectric extreme coupling plasmonic nanoresonator has been researched in this paper. The structure of double and triple metal-dielectric plasmonic nanoresonator is mainly simulated and compared with the monolayer metal-dielectric plasmonic nanoresonator. The conclusion is that the double metal-dielectric plasmonic nanoresonator can achieve extreme coupling in the155THz and410THz.