D型光纤与微管耦合的微流控折射率传感器  

Microfluidic refractive index sensor with D-shape fiber and microtube coupling

作　　者：张伟[1] 万静[1] 蒙列 罗曜伟 郭明瑞 Zhang Wei;Wan Jing;Meng Lie;Luo Yao-Wei;Guo Ming-Rui(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院和柔性电子(未来技术)学院,南京210023

出　　处：《物理学报》2022年第21期52-60,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61574080)资助的课题。

摘　　要：基于D型光纤与回音壁模式的微管谐振腔耦合,结合微流控技术,本文提出一种折射率传感器,其中耦合区采用全封装方式.此传感器所需液体样本很少(约5 nL),不易碎,抗环境干扰能力、可移植性和重复性优于一般光纤与微腔耦合的传感器.通过数值仿真,研究了微流控微管谐振腔的谐振特性,并分析了折射率传感的性能.研究结果表明,管壁厚度和液体折射率对传感性能影响比较大,谐振波长漂移量与液体折射率有良好的线性关系,折射率灵敏度高(510.5-852.7 nm/RIU),Q值可达5.53×10^(4),探测极限可达2.11×10^(-6).Based on the coupling between the D-shape fiber and the microtube resonator in the whispering gallery mode,combined with the microfluidics,a refractive index sensor is proposed in this paper,in which the coupling region is fully encapsulated.This sensor requires a very little liquid sample(about 5 nL),is not fragile,and has better resistance to environmental perturbation,portability and repeatability than the general fiber-microcavity-coupled sensor.By the numerical simulation,the resonance properties of the microfluidic microtube resonator are investigated,and the refractive index sensing performance is analyzed.The research results show that the thickness of the mircotube-wall and the liquid refractive index have a great influence on the sensor performance.The shift of the resonance wavelength has a good linear relationship with the liquid refractive index.Meanwhile,the refractive index sensitivity is high(510.5-852.7 nm/RIU),and the Q-factor reaches up to 5.53×10^(4),the detection limit can arrive at 2.11×10^(-6).

关 键 词：微流控光学 D型光纤 微管谐振腔 折射率传感 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]