基于表面等离子体波的硅基集成非线性光波导设计
毕业论文关键词 表面等离子体波 硅基波导 非线性系数 传播长度 品质因数
Title The design of nonlinear optical silicon-integrated waveguide based on surface plasmon wave
Abstract With the increasing requirements of information bandwidth, capacity and information processing speed, etc., all-optical networks based on all optical signal processing will become a major trend in the near future and nonlinear devices are very important components in all-optical networks. Surface plasmon wave is highly localized to the interface of metal and dielectric, if combined with silicon waveguide to design novel plasma waveguide, we can significantly improve intensity density of the metal-medium interface and enhance the nonlinear properties of the waveguide furthermore. Silver-polymer- silicon - silica substrate structure plasma waveguide is designed with the study of surface plasmon theory and nonlinear effects. Light field is mainly bound in the interface between silver and polymer layer. The nonlinear coefficient reaches4 1 110 Wm of the plasma waveguide and is 74.7 times of the dielectric waveguide. By optimizing the plasma waveguide dimensions, it can be found that when the width and height takes 212.5nm and 262nm respectively, the figure of merit defined by the product nonlinear coefficient and propagation length has maximum value. Using the optimized waveguide structure, it can be observed that the nonlinear coefficient and propagation length are both maintained in large numbers in a large wavelength range. Both the nonlinear coefficient and propagation length are large and their insensitive to the waveguide dimensions and wavelength of plasma silicon waveguide are benefit to the occurrence of nonlinear phenomenon. Taking the composite waveguide of tapered fiber and graphene as the plasma waveguide for experimentand the waveguide of tapered fiber only for contrast, Composite waveguide experiences more significant wavelength conversion efficiency based on four wave mixing than the contrast. Studies have also shown that the conversion efficiency becomes higher when the two wavelength becomes nearer and the power becomes lager of the two optical sources.
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