侧边抛磨单模光纤表面等离子体传感器的设计和优化  

Design and Optimization of Surface Plasmon Resonance Sensor Based on Side Polished Single-Mode Fiber

作　　者：冯信洁 毛培玲 陈小龙[1] 罗云瀚[1,2] 彭水华[1] 陈超英[1] 王芳[1] 唐洁媛[1,2] 余健辉[1,2] 张军[1,2] 卢惠辉 陈哲[1,2] 

机构地区：[1]暨南大学理工学院光电工程系,广东广州510632 [2]光电信息与传感技术广东普通高校重点实验室,暨南大学,广东广州510632

出　　处：《光谱学与光谱分析》2015年第5期1419-1423,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61177075,61008057,11004086);广东省战略性新兴产业核心技术攻关项目(2012A032300016,2012A080302004,2011A081302002);广东省学科建设专项资金项目(2013CXZDA005);中央高校基本科研业务费专项资金项目(21614313,21613325,21613405);东南大学生物电子学国家重点实验室开放研究基金项目(2014H09)资助

摘　　要：光纤表面等离子体共振传感器具有体积小、抗电磁干扰,可以实现在线实时远距离检测的优点。为提高传感器的性能,建立了侧边抛磨光纤表面等离子体共振传感的物理模型,分别研究了侧边抛磨光纤的剩余厚度、银膜层的厚度对传感器的灵敏度、共振峰的深度和半高全宽等的影响。结果表明:光纤剩余厚度越小,表面等离子体共振现象越强;随银膜层的厚度增大,共振峰的宽度变宽,而传感器的灵敏度呈现非单调变化。通过综合表面等离子体共振传感器的折射率传感灵敏度和共振峰半高全宽,提出了质量因数作为传感器的优化指标,并最终得到最优化的设计方案为光纤剩余厚度为66.5μm,银膜的厚度为50nm,此时质量因数达到98.67。Fiber-coupling surface Plasmon resonance sensor has attractive advantages of information transmission such as small volume,anti-electric magnetic field interference,and online real-time remote detection.In order to improve the performance of the sensor,the effect of the residual fiber thickness and the silver film thickness to the sensitivity of the sensor and the depth of the resonance peaks and full width ar half maximum（FWHM）are analyzed respectively.The results show that the increasing fiber residual thickness weakens the SPR phenomenon,and that the increasing silver film thickness widens the resonance peak,while the sensitivity of the sensor does not change monotonously.Through the integration of refractive index sensing sensitivity and full width at half maximum,figure of merit is presented and regarded as the optimized objective.The optimal design is achieved in the case of the fiber residual thickness for 66.5μm,and the silver film thickness for 50 nm.The optimized design with the figure of merit of 98.67 is expected to be applied in the bio-chemical sensing and analysis.

关 键 词：光纤传感器 表面等离子体共振 侧边抛磨光纤 光谱灵敏度 质量因数 

分 类 号：O433[机械工程—光学工程]