微管内壁介质层参数对光微流体传感灵敏度的影响研究  

Effect of Diectric-Layer Parameter Coated on Microtube Inner Wall Surface on Optofluidics Biosensor Sensitivity

作　　者：姬强[1] 江俊峰[1] 刘铁根[1] 刘琨[1] 刘文辉[1,2] 张晶[1] 陈文杰[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室,天津300072 [2]军事交通学院基础部,天津300161

出　　处：《光学学报》2013年第2期241-247,共7页Acta Optica Sinica

基　　金：国家973计划(2010CB327802);国家自然科学基金(11004150;61108070);教育部博士点新教师基金(200800561020);教育部留学回国人员科研启动基金(2010D4-0001);天津市科技支撑计划(11ZCKFGX01900);中国博士后科学基金(201003298)资助课题

摘　　要：研究了微管内壁涂覆介质层的折射率传感灵敏度增强效应,通过建立四层环状结构模型对薄壁微管和厚壁微管进行了模式场分布和传感灵敏度仿真计算。计算结果表明涂覆高折射率介质层有效增加了微管内部的光场能量,从而增强传感灵敏度,将薄壁微管的一阶径向模式折射率传感灵敏度提高近65倍,厚壁微管高阶径向模式的折射率传感灵敏度提高近302倍。随涂覆介质层厚度的变化,厚壁微管高阶径向模式的折射率传感灵敏度变化存在多峰特点,并对该现象从几何光学的角度进行了分析。The sensitivity enhancement effect of microtube coated with a dielectric layer on the inner surface is presented. The simulations of mode-field distribution and senstivity are carried out for thin wall microtubes and thick wall microtubes with an established four-layer ring structure model. The results show that optical field energy in the core of the microtube can be increased when a dielectric layer with high refractive index is coated on the inner wall surface of the microtube, thus the sensitivity is enhanced. The sensitivity of the lst-order radial mode of the thin wall microtube and the high-order radial mode of the thick wall microtube are enhanced by 65 and 302 times, respectively. The refractive-index sensing sensitivity of the high-order radial mode will experience multiple peaks accompanying with the thickness change of the dielectric layer, which is analyzed from the view of geometrical optics.

关 键 词：传感器 生物传感器 灵敏度 微管 回音壁谐振模 

分 类 号：O439[机械工程—光学工程]