银纳米结构的制备、SPP激发与传播损耗的研究

发布时间：2018-01-13 19:38

本文关键词：银纳米结构的制备、SPP激发与传播损耗的研究　出处：《南京大学》2015年硕士论文　论文类型：学位论文

【摘要】：表面等离子体极化激元(SPPs)是入射光与金属表面电子相互耦合,引起金属表面自由电子振动,并在金属与介质材料交界面产生传播的电磁波。表面等离子体极化激元能将光局域到亚波长尺度的空间中进行传播。今年来,对于SPP的研究发现其在生物、环境、光学等领域都有很广阔的应用前景。而一维纳米线是研究SPP的基本结构之一。化学方法合成的银纳米线的表面等离子体极化激元能够突破衍射极限,将光波导局域在亚波长尺寸中传播。银纳米线表面SPP在制备光学器件上有很强的应用前景。基于以上原理,从实验中制备具有良好形貌的银纳米线以及研究SPP在银纳米线上的传播损耗十分重要。论文中总结了基于水热合成法制备银纳米线的具体实验过程,探究了反应温度、反应时间对制备银纳米线的影响。重点探明了表面活性剂PVP在制备银纳米线的作用。研究了银纳米线表面等离子体激元的常用的激发方式。在实验中采用透镜耦合和光纤耦合激发两种方法激发银纳米线表面SPP。解决了光纤耦合激发方法中需要解决的激光耦合如光纤和光纤拉锥等工艺问题。并比较了两种激发方式各自的优劣。利用光纤耦合激发方式直接测量SPP在银纳米线上的损耗,进行了实验数据与模拟曲线的比较。制备的银纳米线上SPP的传播长度在8.5～9.5μm左右。分析了为何相同直径下,不同时刻测量的银纳米线传播长度不同。进一步分析发现,银纳米线表面形貌影响了SPP的传播长度。
[Abstract]:Surface plasmon polaritons (SPPs) is the incident light and electron metal surface coupling caused by electrons in metal surface vibration, and electromagnetic waves in the dielectric and metal material interface propagation. Surface plasmon polaritons can be localized to the optical sub wavelength scales of space travel. This year, for SPP the study found that the biological, environmental, optics and other fields have a very broad application prospect. The nanowire is one of the basic structure of SPP. The chemical synthesis of silver nanowires by surface plasmon polaritons can break the diffraction limit, the optical waveguide propagation in local subwavelength size. Silver nanowires the surface of SPP in the preparation has a strong application prospects of optical devices. Based on the above principle, from the experiment preparation with good morphology of silver nanowires and the study of SPP in silver nanowires on the transmission loss of ten Important. The paper summarizes the specific experimental process of hydrothermal synthesis of silver nanowires based on the study of reaction temperature, reaction time effects of silver nanowires on the key. Proved the surfactant PVP in the preparation of silver nanowires. The silver nanowires surface plasmon excitation the commonly used laser coupling excitation excitation mode. Two kinds of methods to stimulate silver nanowire surface SPP. solves the fiber coupling excitation method to solve the such as fiber and fiber taper process problems by using lens coupling and fiber coupling in the experiment. And comparing two kinds of excitation modes respectively. By using the fiber coupled excitation mode direct measurement of SPP in nano silver nanowires on the loss, compared to the experimental data and simulation curves. The preparation of silver nanowires on SPP propagation length in 8.5 ~ 9.5 m. The paper analyses the reason why the same diameter under different The length of the silver nanowires measured at the time is different. Further analysis shows that the surface morphology of the silver nanowires affects the propagation length of SPP.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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