Chiavaioli Francesco, Laneve Dario, Farnesi Daniele, Falconi Mario Christian, Nunzi Conti Gualtiero, Baldini Francesco, Prudenzano Francesco
Institute of Applied Physics "Nello Carrara" (IFAC), National Research Council of Italy (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze, Italy.
Department of Electrical and Information Engineering, Polytechnic University of Bari, 70125 Bari, Italy.
Micromachines (Basel). 2018 Jul 23;9(7):366. doi: 10.3390/mi9070366.
A comprehensive model for designing robust all-in-fiber microresonator-based optical sensing setups is illustrated. The investigated all-in-fiber setups allow light to selectively excite high-Q whispering gallery modes (WGMs) into optical microresonators, thanks to a pair of identical long period gratings (LPGs) written in the same optical fiber. Microspheres and microbubbles are used as microresonators and evanescently side-coupled to a thick fiber taper, with a waist diameter of about 18 µm, in between the two LPGs. The model is validated by comparing the simulated results with the experimental data. A good agreement between the simulated and experimental results is obtained. The model is general and by exploiting the refractive index and/or absorption characteristics at suitable wavelengths, the sensing of several substances or pollutants can be predicted.
本文阐述了一种用于设计基于全光纤微谐振器的稳健光学传感装置的综合模型。所研究的全光纤装置借助写入同一根光纤的一对相同长周期光栅（LPG），使光能够选择性地将高Q值回音壁模式（WGM）激发到光学微谐振器中。微球和微泡用作微谐振器，并与位于两个LPG之间的腰径约为18 µm的厚光纤锥进行倏逝侧耦合。通过将模拟结果与实验数据进行比较来验证该模型。模拟结果与实验结果之间取得了良好的一致性。该模型具有通用性，通过利用合适波长下的折射率和/或吸收特性，可以预测对几种物质或污染物的传感。
