基于纳米金结构的侧边抛磨光纤SPR传感器设计

发布时间：2018-01-15 15:10

本文关键词：基于纳米金结构的侧边抛磨光纤SPR传感器设计　出处：《暨南大学》2015年硕士论文　论文类型：学位论文

【摘要】：以侧边抛磨光纤为导波载体,利用光纤抛磨区的倏逝场来激发表面等离子体共振效应(Surface Plasmon Resonance,SPR)制成的新型传感器,具有灵敏度更高、集成性好、能够实现实时远距离监测等特点,被广泛地应用在生物医学、物理检测、环境污染等方面。但影响侧边抛磨光纤SPR传感器性能的因素有很多,例如侧边抛磨光纤的抛磨长度、剩余光纤厚度、金属膜厚度以及金属膜结构等。对于这些影响因素的分析,有助于提高传感器的系统性能,并为进一步研究发展新的传感器设计方案。为此,本文首先总结了基于侧边抛磨光纤的SPR传感器研究现状和存在问题,然后系统研究了侧边抛磨光纤的种类和结构参数,以及激励金属结构和参数对于光纤SPR传感器的影响,并分别提出了最优化设计方案。本文的具体内容如下:第一、综述了SPR的发展历程和基本概念,引入了光纤SPR传感器,分析总结了基于侧边抛磨光纤的SPR传感器发展现状和存在的问题,并由此提出本文的主要研究内容。第二、介绍了几种分析光纤SPR的解析方法和数值模拟方法,重点介绍了本文所选用的有限元法。然后描述基于有限元法的仿真软件COMSOL Multiphysics的建模步骤及参数设置。最后讨论金的折射率色散关系,为后续模拟计算做准备。第三、针对侧边抛磨小芯径光纤和侧边抛磨大芯径光纤,分别研究了纳米金膜的厚度、侧边抛磨光纤的剩余厚度、模式阶数等参量对传感器性能的影响,从而得出最佳参数。依据所计算的最佳参数制作侧边抛磨光纤SPR传感器,完成了对传感器的实验标定,并与理论结果进行对比分析。第四、针对激励金属结构,系统研究了纳米金圆柱、纳米金方柱和纳米金三角形柱三种情况下的最优结构参数,并在最优结构参数的基础上仿真模拟了传感器的灵敏度、半高宽和品质因数。研究发现:相对于传统的纳米金属膜结构的光纤SPR传感器,纳米金柱阵列均能在不同程度增强侧边抛磨光纤SPR传感器的灵敏度。第五、总结本论文工作,指出存在的不足之处,并提出进一步完善的建议。本文的创新之处在于:第一、系统研究了纳米金柱阵列的侧边抛磨光纤SPR传感器新结构,通过理论仿真得出该结构能够提高侧边抛磨光纤SPR传感器的灵敏度。第二、提出并建立了基于纳米金三角形柱阵列的SPR传感器。该传感结构能够同时实现传输等离子体的高灵敏度和局域等离子体的高线性度和大测量动态范围等优点,具有重要的研究意义和实用价值。
[Abstract]:The surface Plasmon Resonance is excited by the evanescent field in the polishing area using the side-polished fiber as the guiding wave carrier. The new sensor made by SPRA has the advantages of higher sensitivity, better integration, and the ability to realize real-time remote monitoring, which has been widely used in biomedical and physical detection. However, there are many factors that affect the performance of the side-polishing fiber SPR sensor, such as the polishing length of the side-polishing fiber and the thickness of the remaining fiber. The analysis of these influencing factors will help to improve the system performance of the sensor and develop a new sensor design scheme for further research. This paper first summarizes the research status and existing problems of SPR sensor based on side-polishing optical fiber, and then systematically studies the types and structural parameters of side-polishing fiber. And the influence of the excitation metal structure and parameters on the optical fiber SPR sensor, and put forward the optimal design scheme respectively. The specific contents of this paper are as follows: first, the development history and basic concepts of SPR are summarized. This paper introduces optical fiber SPR sensor, analyzes and summarizes the development status and existing problems of SPR sensor based on side-polishing optical fiber, and puts forward the main research content of this paper. Second. Several analytical methods and numerical simulation methods for analyzing optical fiber SPR are introduced. The finite element method selected in this paper is introduced emphatically, and then the simulation software COMSOL based on finite element method is described. Modeling steps and parameter setting of Multiphysics. Finally, the refractive index dispersion relationship of gold is discussed. Preparation for the subsequent simulation. Third, the thickness of nanocrystalline gold film and the residual thickness of side-edge polishing fiber are studied for side-polishing small-diameter fiber and side-polishing large-diameter fiber respectively. The influence of mode order and other parameters on the performance of the sensor is obtained, and the optimal parameters are obtained. According to the calculated optimal parameters, the optical fiber SPR sensor with side-polishing is fabricated, and the experimental calibration of the sensor is completed. And compared with the theoretical results. 4th, in view of the excited metal structure, the optimal structural parameters of nanoscale gold column, nano-gold square column and nano-gold triangular column are systematically studied. The sensitivity, half-maximum width and quality factor of the sensor are simulated on the basis of the optimal structure parameters. It is found that the fiber optic SPR sensor is compared with the traditional nano-metal film structure. Nanocrystalline gold column arrays can enhance the sensitivity of side-polishing optical fiber SPR sensors in varying degrees. 5th. This paper summarizes the work of this paper and points out the shortcomings. The innovations of this paper are as follows: first, the new structure of the side-polishing optical fiber SPR sensor of nano-#china_person0# array is studied systematically. The theoretical simulation results show that the structure can improve the sensitivity of the side polishing optical fiber SPR sensor. Second. A SPR sensor based on nanoscale gold triangular column array is proposed and established. The sensor structure can simultaneously realize the high sensitivity of transmitting plasma and the advantages of high linearity and large measurement dynamic range of local plasma. . It has important research significance and practical value.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

【参考文献】