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| 基于微环谐振器的溶液浓度传感器研究 |
| Investigation of solution concentration sensor based on microring resonator |
| 投稿时间：2014-03-06 |
| DOI：10.3969/j.issn.1005-5630.2014.05.013 |
| 中文关键词: 微流控光学 微环谐振器 狭缝波导 浓度 时域有限差分法 |
| 英文关键词:optofluidic microring resonator slot waveguidge concentration finite-different time-domain method |
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| 中文摘要: |
| 设计了基于微环谐振器的溶液浓度传感器,提出了一种溶液浓度测量的新方法.介绍了全通微环谐振器(MRR)的结构及传输机制和MRR浓度传感器的工作原理.根据电磁场理论得到了狭缝波导的特征方程,计算了MRR的共振波长,并以乙二醇溶液为例,利用有限时域差分法模拟了外界环境浓度变化时微环的功率谱.模拟结果表明:随着乙二醇溶液浓度增大,MRR的谐振波长与乙二醇溶液浓度的变化近似呈线性关系,与理论计算结果一致;并对该传感器的灵敏度进行计算,结果显示灵敏度可达490.2 nm/RIU.采用MRR测量液体浓度成本低、结构简单,能够实现对环境介质的快速精确测量.所设计传感器还可用于测量固体、气体浓度和其它与浓度、折射率相关的参量. |
| 英文摘要: |
| The solution concentration sensor based on microring resonator(MRR)is designed. Firstly, the structure of an all-pass MRR and operating principle of MRR concentration sensor are introduced. Then the eigenvalue equation of 2D slot waveguides is obtained on the basis of electromagnetic field theory and the resonance wavelength of MRR is accordingly calculated. Finally, the transmission spectrum of MRR for ethylene glycol is simulated on the influence of surround refractive index change. The simulation results show that the relation between the resonance wavelength in the MRR and the different concentrations of ethylene glycol solution is approximate linear, which agrees with the theoretical results. The sensitivity of the sensor is around 490.2 nm/RIU. The sensor proposed in this paper has the advantages of low cost, simple structure and high sensitivity, and it can be integrated with the microfluidic optical devices. The proposed sensor can not only be used to measure solution concentration, but also can be used to measure the concentration or the refractive index of solid, gas and other parameters. |
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