基于侧抛光子晶体光纤的表面等离子体共振传感器特性研究

发布时间：2018-05-03 19:02

本文选题：表面等离子共振 + D型光纤传感器　；参考：《深圳大学》2017年硕士论文

【摘要】：光纤表面等离子体共振传感技术是一种以光纤传感和等离子体共振为基础的传感技术,具有灵敏度高、体积小、便于组网安装、可远程在线监测及操作灵活等优点。光子晶体光纤(Photonic Crystal Fiber,PCF)具有独特的光学性质和结构的可设计性,从而可有效的控制光场激发表面等离子共振,为实现和研制高性能的光纤SPR传感器提供了可能。将光子晶体光纤引入到SPR传感器中,传感器能够为传输光和SPR提供理想的相位匹配条件。本文中采用ESM-12光子晶体光纤作为传感光纤,通过侧抛制备D型光子晶体光纤,并在侧抛区域沉积金膜制成D型光子晶体光纤SPR传感器。利用在线检测系统对传感器的性能进行了深入的研究。本论文主要研究工作如下:1、利用COMSOL Mutiphysics有限元分析软件建立D型ESM-12光子晶体光纤SPR传感器模型,对传感器的传输特性进行仿真计算。深入研究了不同抛磨深度、金属膜厚度对该传感器的折射率灵敏度及传输损耗特性的影响,计算结果表明传感器的折射率灵敏度随着抛磨深度增大而增大,但变化微小。在金属膜厚度为30nm~60nm的范围内,传感器的损耗随着膜厚增大而减小,而折射率灵敏度随着膜厚增大而逐渐变大。通过对镀金膜和银膜的D型光子晶体光纤SPR传感器性能研究,发现镀银膜的传感器灵敏度更高。2、基于理论模拟,研制了D型ESM-12光子晶体光纤SPR传感器,并搭建在线传输式检测系统。利用光纤侧抛系统成功的抛磨出D型光子晶体光纤,并在抛磨区沉积上金属传感膜完成制备D型光子晶体光纤SPR传感器。利用搭建的在线传输式检测系统对传感器的传感特性进行了测试。3、研究了侧抛长度L为15mm,侧抛深度h为60μm,金膜厚度t为45nm的D型光子晶体光纤SPR传感器的传感特性。实验结果显示,在折射率为1.3388~1.3638范围内,传感系统灵敏度随着折射率增大,逐渐升高,最高灵敏度可达2336.2nm/RIU,仿真计算结果和实验测量值基本吻合。同时提出了一种结合共振峰波长和光强度的二维调制方法,提高了传感器的分辨率,达到6.53×10-5RIU。4、研究了不同光纤侧抛长度L对传感器性能的影响,实验分别制备了抛磨长度为10mm、15mm、20mm和25mm四个不同长度的传感器。研究发现,随着抛磨长度L增大,侧抛区表面的非均匀性逐渐变大,导致共振峰半高宽变宽,传感器的灵敏度逐渐降低。实验结果显示,当抛磨长度L控制在10mm,折射率测量范围为1.40~1.42时,传感器的平均灵敏度为7381nm/RIU。5、探究了D型ESM-12光子晶体光纤SPR传感器温度敏感特性。研究表明,在30℃~90℃温度范围内,随着温度的升高,SPR光谱共振峰向短波长方向漂移,且呈线性关系,传感器平均温度灵敏度为0.23416nm/℃。6、对D型ESM-12光子晶体光纤SPR传感器的重复性和稳定性进行了检测。实验选择了传感长度L为20mm的D型光子晶体光纤SPR传感器在室温(24℃)条件下做重复性试验,分别对每一折射率溶液及每一组折射率溶液的共振波长漂移量进行计算,其最小标准方差(λ_(SD))分别为1.15nm和2.58nm,说明传感器对同一样品表现出较好的重复性,对更换不同样品表现出较好的稳定性。7、提出了一种D型全固态光子晶体光纤SPR传感器,对D型全固态光子晶体光纤SPR传感器的抛磨深度、折射率灵敏度进行理论仿真和分析,发现抛磨深度对传感器的灵敏度影响较小,实验上也进行了相应的探索。
[Abstract]:Optical fiber surface plasmon resonance sensing technology is a sensing technology based on optical fiber sensing and plasma resonance. It has the advantages of high sensitivity, small volume, easy to set up network, remote on-line monitoring and flexible operation. Photonic Crystal Fiber (PCF) has unique optical properties and structure. In order to effectively control the surface plasmon resonance in the light field, it is possible to realize and develop the high-performance optical fiber SPR sensor. The photonic crystal fiber is introduced into the SPR sensor, and the sensor can provide ideal phase matching conditions for the transmission light and the SPR. In this paper, the ESM-12 photonic crystal fiber is used as the sensing fiber. The D photonic crystal fiber is prepared by side throwing, and the D photonic crystal fiber SPR sensor is made by depositing gold film in the side throwing region. The performance of the sensor is studied by on-line detection system. The main research work of this paper is as follows: 1, D type ESM-12 photonic crystal fiber S is established by using COMSOL Mutiphysics finite element analysis software. The PR sensor model is used to simulate the transmission characteristics of the sensor. The influence of the thickness of the metal film on the refractive index sensitivity and transmission loss characteristics of the sensor is studied. The results show that the sensitivity of the sensor increases with the increase of the polishing depth, but the thickness of the metal film is small. In the range of 30nm~60nm, the loss of the sensor decreases with the increase of the thickness of the film, and the sensitivity of the refractive index becomes larger with the increase of the thickness of the film. Through the study of the D type photonic crystal fiber SPR sensor of the gold plating and silver films, it is found that the sensitivity of the silver plated film sensor is higher.2. Based on the theoretical simulation, the D type ESM-12 photonic crystal light is developed. The fiber SPR sensor and the on-line transmission detection system are built. Using the optical fiber side throwing system, the D photonic crystal fiber is polished successfully, and the D photonic crystal fiber SPR sensor is prepared by the metal sensing film deposited on the polishing area. The sensor characteristics of the sensor are tested by the built on-line transmission detection system, and the research of the sensor is studied. The sensing characteristics of the D type photonic crystal fiber SPR sensor with the side throwing length of L 15mm, the side throwing depth of H 60 m and the gold film thickness t of 45nm are D type photonic crystal fiber SPR sensors. The experimental results show that the sensitivity of the sensing system increases with the refractive index, and the highest sensitivity can reach 2336.2nm/RIU. The simulation results and the experimental measurements are measured. At the same time, a two-dimensional modulation method combining the resonant peak wavelength and light intensity is proposed, which improves the resolution of the sensor and reaches 6.53 x 10-5RIU.4. The influence of different fiber side length L on the performance of the sensor is studied. The experiments are made to prepare four sensors with different lengths of 10mm, 15mm, 20mm and 25mm respectively. It is found that the non uniformity of the surface of the side throwing area becomes larger with the increase of the grinding length L, which leads to the half width and width of the resonant peak, and the sensitivity of the sensor gradually decreases. The experimental results show that the average sensitivity of the sensor is 7381nm/RIU.5 when the length of the polishing length is L controlled in 10mm and the measurement range of the refractive index is 1.40~1.42, and the D type ESM-12 photon is explored. The temperature sensitivity of the crystal fiber SPR sensor shows that, with the temperature rising at 30 C ~90, the SPR spectral resonance peak is drifting to the short wavelength direction and has a linear relationship. The average temperature sensitivity of the sensor is 0.23416nm/ C.6, and the repeatability and stability of the D type ESM-12 photonic crystal fiber SPR sensor are examined. The experiment selected the D type D photonic crystal fiber SPR sensor with a sensing length of 20mm at room temperature (24 degrees C) to make a repeatability test. The resonance wavelength drift of each refractive index solution and each group of refractive index solutions was calculated respectively. The minimum standard variance (SD) was 1.15nm and 2.58nm respectively, indicating the sensor to the same sample. It shows good repeatability and shows good stability.7 for the replacement of different samples. A D type all solid-state photonic crystal fiber SPR sensor is proposed. The polishing depth of D type all solid-state photonic crystal fiber SPR sensor and the sensitivity of refractive index are theoretically simulated and analyzed. It is found that the influence of the polishing depth on the sensitivity of the sensor is more than that of the SPR sensor. Small, the experiment has also carried out the corresponding exploration.

【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253;TP212

【参考文献】