基于非对称表面芯双芯光纤集成式干涉仪的生物传感技术研究

项目名称： 基于非对称表面芯双芯光纤集成式干涉仪的生物传感技术研究

项目编号： No.61275087

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 周爱

作者单位： 武汉理工大学

项目金额： 82万元

中文摘要： 针对现有光纤生物传感器灵敏度低、机械强度差、制作工艺复杂等问题，本项目提出了一种基于非对称表面芯双芯光纤的光纤生物传感技术。通过将光纤的一个纤芯设计在光纤包层与空气的界面处直接获得较强的倏逝场，解决了传统光纤生物传感器需要对光纤包层进行抛磨、腐蚀等处理才能获得较强倏逝场的问题；通过在光纤轴心设置另一个纤芯作为参考光路，构建集成式光纤干涉仪，将被测样品浓度的变化转换成光相位的变化进行测量，具有比传统的倏逝场型光纤传感器更高的测量灵敏度，同时又解决了目前模间干涉型（纤芯模与包层模）传感器干涉光谱多为多模干涉的问题。本项目提出的生物传感器具有灵敏度高、机械强度好、制作简单和成本低的优点。通过本项目的研究，为光纤生物传感领域提供一种全新的检测方法和技术手段，对促进光纤生物传感技术的发展具有重要的科学意义和应用价值。

中文关键词： 非对称双芯光纤；双芯环形芯光纤；七芯光纤；；

英文摘要： Aim at problems of the present fiber biosensors such as low sensitivity, poor mechanical strength and complex fabrication process; we propose a novel optical fiber biosensing technique based on an asymmetric surface twin-core fiber. One core of the twin-core fiber is designed at the interface of the fiber cladding and air to obtain strong evanescent wave, which solve the problems that for the traditional fiber biosensors, to get strong evanescent wave part or all of the cladding have to be removed using side-polishing or chemical etching method. The other core is located at the axis of the fiber acting as reference beam, and constructing an integrated in-fiber interferometer together the surface core. Therefore the concentration change of the tested sample can be detected from the variation of the phase difference between the surface core and the central core. Such a device has a higher sensitivity than the traditional evanescent wave type fiber biosensors. Meanwhile its interference spectrum which is achieving from the fundamental core mode of the central core and the surface core is better than the other interferometric biosensor whose interference spectrum is obtained from the core mode and the cladding modes. The biosensor proposed in the project has advantages such as high sensitivity, good mechanical stren

英文关键词： Asymmetric twin core fiber；Dual annular core fiber；Seven-core fiber；；