基于平面波导激励的修正长程表面波的传感器研究  

Modified long-range surface plasmon wave sensor based on planar waveguide excitation

作　　者：刘瑾[1] 杨海马[2] 

机构地区：[1]上海工程技术大学电子电气工程学院,上海201620 [2]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《应用光学》2018年第2期246-251,共6页Journal of Applied Optics

基　　金：国家自然科学基金(61302181);上海市自然科学基金(14ZR1418400和14ZR1418500);上海市教委创新基金(13YZ111)

摘　　要：为了解决传统的强度检测型波导激励的表面等离子体共振传感器灵敏度不高的缺点,研究平面波导激励的介质膜-金属-被测介质的可激发修正的长程表面等离子体波结构。采用离子交换的方法制备折射率可用费米函数拟合的平面波导,研究了离子交换时间对平面波导的模数及等效折射率等特性的影响,为激励波导的优化设计提供有效依据。采用制备的平面波导激励介质膜-金属-被测介质的非对称结构,研究金属材质、介质膜厚和金属膜厚等因素对修正的长程表面等离子体波特性的影响,对被测溶液的折射率进行检测。实验结果表明,其灵敏度为传统的强度检测型表面等离子体共振传感器的6倍,并且具有较好的线性关系。Sensitivity of the waveguide surface plasmon resonance sensor based on intensity detection method should be improved. Modified long range surface plasmon wave,which is excited by the planar waveguide in the dielectric film-metal film-testing dielectric structure, is studied. Method of ion exchange is used to prepare the planar waveguide whose refractive index can be fitted by the FERMI function. Influences of ion exchange time on the modulus and equivalence refractive index are studied,thus the effective basis for the optimization design of the waveguide is provided. An asymmetry structure of dielectric film-metal film-testing film is excited by planar waveguide, and influences of metal material, the thickness of dielectric film and metal film on the characteristic of long range surface plasmon wave are researched. Experiments are realized to detect the refractive index of solutions. Results show that sensitivity of this method is about 6 times that of traditional surface plasmon resonance sensor＇s,and has a good linear relationship.

关 键 词：长程表面等离子体波 平面波导 灵敏度 

分 类 号：TN252[电子电信—物理电子学]