强色散耦合谐振器感应透明结构的传感特性研究

The optical sensing based on optical resonator structures with strong dispersion, which is beneficial for the realization of miniature and highly sensitive optical sensors, has become a hot topic in the domain of optical device. However, there are some shortcomings. The influences of the transmittance and modulation of input light on the sensing characteristics are ignored. The sensing characteristics change with measured variables and the frequency distribution of sensing sensitivity is heterogeneous. The shortcomings can result in large sensing errors or even sensing failures, so the developments and applications of the sensing technology are restricted. In this project, we investigate the sensing characteristics of the coupled resonator induced transparency structure, based on its advantages such as high transmittance, flexible design of dispersion and simplicity of the structure. Firstly, we investigate the influences of structure parameters on the dispersion of the coupled resonator induced transparency structure, and obtain the method of constructing strong dispersion in the structure. Then, we establish the sensing theoretical model based on the dispersion of the structure, and analyse the dispersion and sensing characteristics in sensing process. Lastly, we investigate the optimization of sensing characteristics of the structure. This project aims to investigate the dispersion and sensing characteristics of the coupled resonator induced transparency structure in sensing process, and further obtain highly sensitive sensing method based on the dispersion of the structure. Thus, this project can overcome the shortcomings and provide theoretical and technical supports for the realization of new and highly sensitive sensors.

利用强色散光学谐振器结构进行光学传感是目前光器件领域研究的热点课题，有利于实现小型化、高灵敏度的光学传感器件。这方面研究的不足体现为：忽视透射率、输入光调制方式等对传感特性的影响；传感特性随待测变量变化；传感灵敏度频率分布不均；均可导致传感结果误差大甚至传感失效，严重限制了该项技术的发展和应用。本项目基于耦合谐振器感应透明结构透射率高、色散设计灵活、结构简单等优点，研究基于其色散的传感特性，具体内容包括：揭示其结构参数对色散的影响机理和规律，获得构建强色散的方法；建立基于其色散的传感理论模型，分析传感过程中色散和传感特性的变化规律；优化其传感特性。本项目旨在揭示耦合谐振器感应透明结构的色散和传感特性在传感过程中变化规律，进而获得基于耦合谐振器感应透明结构色散的高灵敏度传感方法，克服以上不足，为实现新型、高灵敏度的传感器件奠定理论和技术基础。

基于强色散光学谐振器结构的光学传感，有利于实现小型化或高灵敏度的传感器件，但目前这方面的研究有待深入，主要体现为：忽视透射率、色散强度频率分布等对传感特性的影响；灵敏度频率分布不均，容易导致传感结果误差大；传感特性随待测变量变化，给系统带来大的不稳定性。. 本项目基于耦合谐振器感应透明结构透射率大、色散设计灵活、结构简单等优点，研究了基于其强色散的传感特性：. （1）耦合谐振器感应透明结构的透射谱、色散. 求解了透射率、色散，研究了结构参数对透射率、色散特性如色散带宽、色散强度及其频率分布等的影响规律，并进行了实验验证，结果表明，可利用结构参数构建强色散、及平坦的透射谱和强度均匀的色散，且调节损耗或增益是调控色散的有效方法。. （2）基于耦合谐振器感应透明结构色散的传感理论模型. 建立了基于结构色散的传感理论模型，将待测变量区分为互易和非互易变量，研究了结构参数、变量对传感特性如工作频率范围及带宽、灵敏度及其频率分布等的影响规律，结果表明，基于结构的强色散可实现高灵敏度的光学传感，且传感灵敏度与色散强度成正比。. （3）耦合谐振器感应透明结构传感特性的优化. 研究了利用结构参数优化传感特性，光源频率需位于色散带宽内，利用结构参数构建了平坦的传感灵敏度频率分布曲线，大大降低了灵敏度频率分布不均所引起的噪声，确立了基本的检测方式，如输入光调制方式、输出信号解调方式等。. （4）耦合谐振器感应透明结构的改进. 改进了结构，通过增加谐振器数量或改进耦合方式，提升了结构的传感性能，获得了更高的传感灵敏度、更多的传感信息，实验研究了改进后的单光学谐振器自干涉结构，获得了稳定的感应透明现象和优越的传感特性。. 本项目的结果提供了耦合谐振器感应透明结构传感的理论依据和实验数据，为结构在传感方面的应用奠定了坚实的基础，后续工作可以本项目的结果为基础，推进结构在传感方面的应用，进而获得新型、高灵敏度的传感器件。