Chen Qi, Gao Feng, Wang Zhaokun, Wang Hailong, Wang D N, Zhou Shenghua, Pan Guiming
Appl Opt. 2021 Sep 20;60(27):8226-8230. doi: 10.1364/AO.434019.
Developing micrometer-nanometer size optical fiber sensors has promising application prospects in microenvironments, such as biological cells, micro robots, and microfluids. We propose a new strategy to fabricate a microfiber sensor probe (MSP). A femtosecond laser was applied to integrate cascaded Fabry-Perot interferometers (FPIs) into a silica microfiber. And a MSP with diameter of ∼8µ, extinction ratio of 15 dB, fitness of 24.6, and Q-factor of 2310 was demonstrated in the experiment. In addition, the MSP was applied for the refractive index and thermal measurement and the sensitivity was observed to be 10 pm/°C and 18.5 nm/RIU. The two-beam approximation model was applied to analyze the spectrum, and simulations were taken to research the refractive index sensitivity influenced by the fiber size.
开发微米-纳米尺寸的光纤传感器在生物细胞、微型机器人和微流体等微环境中具有广阔的应用前景。我们提出了一种制造微纤维传感器探头（MSP）的新策略。应用飞秒激光将级联法布里-珀罗干涉仪（FPI）集成到二氧化硅微纤维中。实验中展示了一种直径约为8µ、消光比为15 dB、拟合优度为24.6且品质因数为2310的MSP。此外，该MSP被用于折射率和温度测量，观察到的灵敏度分别为10 pm/°C和18.5 nm/RIU。应用双光束近似模型对光谱进行分析，并通过模拟研究了光纤尺寸对折射率灵敏度的影响。
