Research On Propagation Properties Of Nano-waveguide Based On Surface Plasmon Polaritons

As Surface Plasmon Polaritons(SPPs) has the properties of transmission enhancement,sub-wavelength localization, that is achieved in the nanometer scale metal structures formed lightfield localization and provides the possibility of guided waves. So it brings new opportunities toraise the level of integration of photonic devices. In this thesis, we present the basic theory of SPPsand FDTD numerical calculation method which is used to analyze of SPPs mode field distribution.The main research work includes the following aspects:We design a novel and combined metal/insulator/metal structure, and find that this structurenot only produce SPPs successfully but also can provide energy compensation to SPPs. So itimproves transmission distance on the surface of metal.We study a metal/insulator/metal Surface Plasmon waveguide Bragg grating structure byFDTD experimental simulation it’s structure parameters of grating period, the number of grating,the grating depth and the ratio of space to the impact of transmission spectrum. Eventually were-set the structure parameters of the waveguide Bragg grating, and get3dB bandwidth of70nm,and the extinction ratio of17.08dB.We design a metal/insulator/metal waveguide structure filter. The result shows that resonantpeak of different wavelength by adjusting the length of the resonator and the bandwidth of theresonant peak can be adjusted by adjusting the parameters of transmissive slit. According to thisconclusion, we optimize the filter structure parameters, and get1.55μm narrowband filter whichhas a relatively small3dB bandwidth of24nm.SPPs-based filter can filtered light in nanometer, and can be applied to high-speedlarge-capacity optical fiber communication system.