空心微瓶谐振腔的封装及折射率传感特性研究北大核心CSCD

为提高传感器的稳定性和便携性,提出一种基于空心微瓶谐振腔的折射率传感器,对系统进行封装并对其折射率传感特性进行研究。仿真分析不同壁厚下空心微瓶谐振腔径向回音壁模式的光场分布,光场在微瓶内部的占比随着器件壁厚的减少而增加,有利于提高传感灵敏度。为减小空心微瓶谐振腔的壁厚,利用氢氟酸对石英毛细管进行腐蚀,使用光纤熔接机制备了薄壁空心微瓶谐振腔。采用紫外胶将耦合系统封装固定在载玻片上,器件稳定性和便携性得到提升。研究了封装器件在不同折射率匹配液下的传感特性,器件传感灵敏度为26.50 nm/RIU。该传感器具有稳定性强、灵活性高、损耗小等优点,在光微流控折射率检测方面拥有很大的应用潜力。

Package of hollow micro-bottle resonator and refractive index sensing properties

To improve the stability and portability of the sensor, a refractive index sensor based on hollow micro-bottle resonator was proposed to package the system and study its refractive index sensing properties. The optical field distribution of radial echo-wall mode of hollow micro-bottle resonator under different wall thicknesses was simulated and analyzed. The proportion of the optical field inside the micro-bottle increased with the decrease of wall thickness of device, which was beneficial to improve the sensing sensitivity. To reduce the wall thickness, the quartz capillary was etched by hydrofluoric acid, which was used to fabricate the thin-wall hollow micro-bottle resonator by fusion splicer. The coupling system was packaged and fixed on a slide by using UV adhesive, which enhanced the stability and portability of the sensor. Finally, the sensing characteristics of the packaged device under different refractive index matching fluids were studied and the sensing sensitivity was 26.50 nm/RIU. The proposed sensor has the advantages of high stability, high flexibility and low loss, which has great application potential in optofluidic refractive index detection.