Xu Zhilin, Sun Qizhen, Li Borui, Luo Yiyang, Lu Wengao, Liu Deming, Shum Perry Ping, Zhang Lin
Opt Express. 2015 Mar 9;23(5):6662-72. doi: 10.1364/OE.23.006662.
We propose and experimentally demonstrate a refractive index (RI) sensor based on cascaded microfiber knot resonators (CMKRs) with Vernier effect. Deriving from high proportional evanescent field of microfiber and spectrum magnification function of Vernier effect, the RI sensor shows high sensitivity as well as high detection resolution. By using the method named "Drawing-Knotting-Assembling (DKA)", a compact CMKRs is fabricated for experimental demonstration. With the assistance of Lorentz fitting algorithm on the transmission spectrum, sensitivity of 6523nm/RIU and detection resolution up to 1.533 × 10(-7)RIU are obtained in the experiment which show good agreement with the numerical simulation. The proposed all-fiber RI sensor with high sensitivity, compact size and low cost can be widely used for chemical and biological detection, as well as the electronic/magnetic field measurement.
我们提出并通过实验证明了一种基于具有游标效应的级联微光纤结谐振器（CMKR）的折射率（RI）传感器。由于微光纤的高比例倏逝场和游标效应的光谱放大功能，该RI传感器具有高灵敏度和高检测分辨率。通过使用“拉-结-组装（DKA）”方法，制造了一个紧凑的CMKR用于实验演示。借助于对传输光谱的洛伦兹拟合算法，在实验中获得了6523nm/RIU的灵敏度和高达1.533×10^(-7)RIU的检测分辨率，这与数值模拟结果吻合良好。所提出的全光纤RI传感器具有高灵敏度、紧凑尺寸和低成本，可广泛用于化学和生物检测以及电磁场测量。
