| Surface Plasmon Polaritons(SPPs) are one electromagnetic mode between a kind of lightwave received by changing the subwavelength structure of metal surface and the transferable surface charge, which can be used to transfer light by supporting the surface plasmon wave transfering between metal and media interface without being limited by the limitation of diffraction limit. SPPs play a significant role in manipulating light on nanoscale because of its unique characteristic. In this paper, based on the study of symmetric SPPs waveguide structure, the amplication and propagation characteristics of SPPs are analyzed in improved symmetric waveguide structure. This study provides a direction for surface plasmon techonology in applications of SPPs chips and optoelectronic integration.In this paper, the following specific researchs are done:The basic parameters characterictics of SPPs are defined, the dispersion relation of SPPs is analyzed, and the development states of four types of SPPs waveguide are also introduced: metal-media, the loaded insulator, long-range, metal-insulator-metal. The coupling model of SPPs with the structure of Kretschmann is analyzed.An improved sysmmetrical metal waveguide Surface Plasmon Amplification by Stimulated Emission of Radiation(SPASER) amplifier are improved, and an improved MIM inverse beam equation is proposed. The high localized features of electromagnetic field of designed structure is verified through the finite element mode analysis method, and that structure can increase the SPPs propagation distance for about 20 times is also obtained through the anlysis of FDTD and do not have the unstable phenomenon caused by the gain-compensation as the propagation are enhanced. The improved design of this sysmmetrical metal waveguide amplifier can provide theoretical and technological foundation for the large scale integrated photonics chips.A SPPs device based on improved sysmmetrical media waveguide is proposed by using the multilayered waveguide structure of loaded glass, and imported Kretschmann structure model to fulfill the excitation of SPPs. This device can acquire the feature of increasing the propagation distance without sacrificing the subwavelength scale of the waveguide. The FDTD analysis result shows: the improved waveguide structure can obviously increase the propagation distance and improve the intensity of electric field. By comparing thin layers with the different thicknesses, the effect of localized is best while the thin layer is thinnest and the improved structure can increase the coupling effect of SPPs. This structure of SPPs provides a key devices for novel photonics devices, broadban communication system, optoelectronic intergated circuit, etc. |
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