聚合物长周期波导光栅折射率传感器的研究
发布时间：2018-10-26 09:32
【摘要】：近年来,为应对日益严峻的水质安全问题、食品药品安全问题以及环境污染问题,满足水质检测和环境监测等领域对高灵敏度、低成本的微型便携式生化传感器的迫切需求,科研工作者们对光学生化传感器展开了深入研究。光学生化传感器除了具有灵敏度高、响应速度快、抗电磁干扰能力强等优点,还能工作在传统生化传感器无法工作的高温、高湿、易燃、易爆等恶劣环境之下,因此引起了广泛关注。根据检测原理和器件结构的不同,光学生化传感器可分为标记型和非标记型两类。标记型光学生化传感器在对检测物进行标定时很可能会引入不必要的污染或标定物的检测活性受到影响,从而干扰了测量结果,并且测试时间较长,设备复杂昂贵。非标记型光学生化传感器可避免标定物对被检测物的干扰,且能够实时在线监测分析过程。非标记型光学生化传感器的研究主要集中在光纤生化传感器、光流控生化传感器和平面光波导生化传感器。本文首次提出将待测液体作为长周期波导光栅包层的聚合物长周期波导光栅折射率传感器,使其作为非标记型传感器工作。文章首先讨论了光波导的研究方法、模式耦合理论以及长周期波导光栅的工作原理,特别是芯层模式和包层模式之间的耦合;其次,针对聚合物长周期波导光栅折射率传感器的工作特性,分析了芯层传输的色散曲线,推导出芯层波导的单模传输条件,仿真计算出芯层模式与包层模式之间的耦合系数,确定长周期波导光栅的周期和长度等参数;再次,在实验室利用紫外曝光、显影、磁控溅射、感应离子刻蚀等工艺制作出传感器样品;最后,搭建光学测试平台,利用宽带光源(1520nm-1610nm)作为输入,改变作为长周期光栅包层的液体材料折射率,检测出输出光谱中不同折射率对应的中心波长漂移量,从而得到传感器的传感灵敏度,同时测试了传感器的温度敏感特性。实验结果显示:待测液体每改变0.002的折射率,相应的中心谐振波长移动18.75nm,器件的传感灵敏度为9375nm/RIU;针对温度敏感特性,环境温度每改变1℃,某一固定待测液体的中心谐振波长会移动1.47nm。
[Abstract]:In recent years, in order to cope with the increasingly serious problems of water quality safety, food and drug safety and environmental pollution, and meet the urgent needs of high sensitivity and low cost micro portable biochemical sensors in the fields of water quality detection and environmental monitoring, Researchers have carried out in-depth research on optical biochemical sensors. In addition to the advantages of high sensitivity, high response speed and strong ability to resist electromagnetic interference, optical biochemical sensors can also work in harsh environments such as high temperature, high humidity, flammability, explosive and so on, which cannot be worked by traditional biochemical sensors. As a result, wide attention has been paid. According to the detection principle and device structure, optical biochemical sensors can be divided into two types: labeled and unlabeled. The labeled optical biochemical sensor may introduce unnecessary contamination or the detection activity of the calibration object will be affected when calibrating the detection object, which will interfere with the measurement results, and the testing time is longer and the equipment is complicated and expensive. The unlabeled optical biochemical sensor can avoid the interference of the calibrated object to the detected object and can monitor the analysis process online in real time. The research of unlabeled optical biochemical sensor is mainly focused on optical fiber biochemical sensor, optical fluidic biochemical sensor and planar optical waveguide biochemical sensor. In this paper, a polymer long-period waveguide grating refractive index sensor using the liquid to be measured as the cladding layer of the long-period waveguide grating is proposed for the first time, so that it can work as a non-labeled sensor. Firstly, the research method of optical waveguide, mode coupling theory and the working principle of long-period waveguide grating are discussed, especially the coupling between core mode and cladding mode. Secondly, according to the working characteristics of polymer long-period waveguide grating refractive index sensor, the dispersion curve of core layer propagation is analyzed, the single mode transmission condition of core layer waveguide is deduced, and the coupling coefficient between core layer mode and cladding mode is calculated by simulation. The period and length of the long-period waveguide grating are determined. Thirdly, the sensor samples are fabricated by ultraviolet exposure, development, magnetron sputtering and induced ion etching in the laboratory. Finally, the optical testing platform is built, and the refractive index of liquid material as a long period grating cladding is changed by using broadband light source (1520nm-1610nm) as input, and the central wavelength drift corresponding to different refractive index in output spectrum is detected. The sensitivity of the sensor is obtained and the temperature sensitivity of the sensor is tested. The experimental results show that the corresponding central resonant wavelength shifts 18.75 nm with the change of refractive index of 0.002, and the sensor sensitivity of the device is 9375 nm / r IU. According to the temperature sensitivity, for each change of ambient temperature 1 鈩，
本文编号：2295287
[Abstract]:In recent years, in order to cope with the increasingly serious problems of water quality safety, food and drug safety and environmental pollution, and meet the urgent needs of high sensitivity and low cost micro portable biochemical sensors in the fields of water quality detection and environmental monitoring, Researchers have carried out in-depth research on optical biochemical sensors. In addition to the advantages of high sensitivity, high response speed and strong ability to resist electromagnetic interference, optical biochemical sensors can also work in harsh environments such as high temperature, high humidity, flammability, explosive and so on, which cannot be worked by traditional biochemical sensors. As a result, wide attention has been paid. According to the detection principle and device structure, optical biochemical sensors can be divided into two types: labeled and unlabeled. The labeled optical biochemical sensor may introduce unnecessary contamination or the detection activity of the calibration object will be affected when calibrating the detection object, which will interfere with the measurement results, and the testing time is longer and the equipment is complicated and expensive. The unlabeled optical biochemical sensor can avoid the interference of the calibrated object to the detected object and can monitor the analysis process online in real time. The research of unlabeled optical biochemical sensor is mainly focused on optical fiber biochemical sensor, optical fluidic biochemical sensor and planar optical waveguide biochemical sensor. In this paper, a polymer long-period waveguide grating refractive index sensor using the liquid to be measured as the cladding layer of the long-period waveguide grating is proposed for the first time, so that it can work as a non-labeled sensor. Firstly, the research method of optical waveguide, mode coupling theory and the working principle of long-period waveguide grating are discussed, especially the coupling between core mode and cladding mode. Secondly, according to the working characteristics of polymer long-period waveguide grating refractive index sensor, the dispersion curve of core layer propagation is analyzed, the single mode transmission condition of core layer waveguide is deduced, and the coupling coefficient between core layer mode and cladding mode is calculated by simulation. The period and length of the long-period waveguide grating are determined. Thirdly, the sensor samples are fabricated by ultraviolet exposure, development, magnetron sputtering and induced ion etching in the laboratory. Finally, the optical testing platform is built, and the refractive index of liquid material as a long period grating cladding is changed by using broadband light source (1520nm-1610nm) as input, and the central wavelength drift corresponding to different refractive index in output spectrum is detected. The sensitivity of the sensor is obtained and the temperature sensitivity of the sensor is tested. The experimental results show that the corresponding central resonant wavelength shifts 18.75 nm with the change of refractive index of 0.002, and the sensor sensitivity of the device is 9375 nm / r IU. According to the temperature sensitivity, for each change of ambient temperature 1 鈩，
本文编号：2295287
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