传感技术学报2016，Vol.29Issue(2)：188-194,7.DOI:10.3969/j.issn.1004-1699.2016.02.007
基于波矢可调谐对称结构的条波导型SPR传感系统研究
Study on the SPR Sensing System Based on the Adjustable Wave Vector Symmetrical Structure Excited by the Channel Waveguide
摘要
Abstract
The wave vector matching condition is limited in the waveguide SPR sensor because of the large value of the mode refractive index. Most of the waveguide SPR sensors are excited by the planar waveguide,so it is difficult to docking with fiber. A symmetrical SPR sensing structure excited by the channel waveguide is presented in this pa⁃per to overcome those difficulties. By analyzing the mode characteristic of the metal-dielectric-metal structure,the possibility of the SPW excitation in this structure and the adjustablemechanism of the wave vector are studied. The single-mode channel waveguide is prepared and used to excite the symmetrical sensing structure. The testing range of symmetrical structure and traditional structure excited by the channel waveguide are compared. Effects of metal ’ s thickness,the thickness on the measurement results are researched. Experimental results show that the sensing characters can be changed by the thickness of the metal films,andthe wave vector matching condition can be adjust⁃ed by changing of dielectric’s thickness between the two metal films,thus the testing range is adjustable. Testing re⁃sults have good linearity.关键词
SPR/对称传感结构/调谐机制/波矢匹配Key words
SPR/symmetrical sensing structure/adjustable mechanism/wave vector matching分类
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刘瑾,杨海马,宋万清..基于波矢可调谐对称结构的条波导型SPR传感系统研究[J].传感技术学报,2016,29(2):188-194,7.基金项目
国家自然科学基金项目(61302181)；上海市自然科学基金项目(14ZR1418400，14ZR1418500)；上海市教委创新基金项目 （61302181）
