| With the properties of transmission enhancement and sub-wavelength localization, SurfacePlasmon Polaritons(SPPs) imply the possibility of guiding light on the submicron scale. SPPs hasbeen one of hot issues of nano-photonics recently.Thesis introduces the basic theory of Surface Plasmon Polaritons and the research situation athome and abroad in the field of SPPs. the dispersion relation of SPPs, excitation method andcharacteristic parameters is analyzed. Thesis also introduces the metal Durde model and the methodhow to calculate the metal parameters. The propagation theory of SPPs in Anisotropic medium hasbeen analyzed.Based on the finite difference time domain method, the single slit waveguide structure of MIMis investigated. The study shows that the slit can be considered as a Fabry-Perot cavity. SPPs mainlyaffects the strength of the transmitted light intensity, the function of F-P cavity is to make thetransmitted light change periodically. On the basis, nonlinear optical material is introduced intoMIM device. The properties of metal-nonlinear dielectric-metal (M-NL-M) structure are studied.The relation between the propagation constants of the two SPP modes and incident light intensityare studied with the dispersion relation of M-NL-M device. Using modulation of the two SPPmodes’ propagation constants difference with incident light intensity, a dual channel opticalswitching is realized.Based on nonlinear finite difference time domain method, the influence of3rd nonlinear effectis investigated on excitation, coupling, transmission and dispersive relation of SPPs in micro-andnano-metallic structures containing nonlinear materials. The dynamic control of beam deflectionand focusing is studied by modulating incident light. After we research, large modulation ranges ofdeflection angle(7°~22°) and focusing distance (above1μm) are achieved, which will offer greatapplications in near-field optics and nano-integrate optic etc. |
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