Chen Hongliang, Yang Xiaozhan, Feng Wenlin
Appl Opt. 2021 Feb 1;60(4):799-804. doi: 10.1364/AO.409092.
A novel fiber-optic Mach-Zehnder interferometer based on , , /, and - sensing film for cadmium-ion () detection is proposed and fabricated. The photonic-crystal fiber (PCF) is sandwiched between the no-core-fiber-1 (NCF1) and no-core-fiber-2 (NCF2), forming the Mach-Zehnder interferometer with the NCF1-PCF-NCF2 structure, which is regarded as the sensing unit. The , , /, and - sensing films are, respectively, coated on the surface of two NCFs' claddings. The comparative experiment results of the sensors with four membranes (, , /, -) show that the sensors have good sensing performance for in the concentration range of 0-100 µM. When these sensing films adsorbed , the monitoring wavelength shows blueshift of 0.6931 nm, 1.0252 nm, 1.9505 nm, respectively, and redshift of 3.0258 nm, and the sensitivities are 6.931 pm/µM, 10.252 pm/µM, 19.505 pm/µM, and 30.258 pm/µM, respectively. The sensor with - bilayer film exhibits the optimal response to with excellent selectivity and stability. The proposed sensor has the advantages of simple structure, easy fabrication, small size, etc., having potential application in the monitoring of in aqueous solution.
提出并制作了一种基于 , , /, 和 - 传感膜用于镉离子（）检测的新型光纤马赫 - 曾德尔干涉仪。光子晶体光纤（PCF）夹在无芯光纤 -1（NCF1）和无芯光纤 -2（NCF2）之间，形成具有 NCF1 - PCF - NCF2 结构的马赫 - 曾德尔干涉仪，该结构被视为传感单元。 , , /, 和 - 传感膜分别涂覆在两个 NCF 包层的表面。具有四种膜（, , /, -）的传感器的对比实验结果表明，这些传感器在 0 - 100 µM 的浓度范围内对 具有良好的传感性能。当这些传感膜吸附 时，监测波长分别出现 0.6931 nm、1.0252 nm、1.9505 nm 的蓝移和 3.0258 nm 的红移，灵敏度分别为 6.931 pm/µM、10.252 pm/µM、19.505 pm/µM 和 30.258 pm/µM。具有 - 双层膜的传感器对 表现出最佳响应，具有优异的选择性和稳定性。所提出的传感器具有结构简单、易于制作、尺寸小等优点，在水溶液中 的监测方面具有潜在应用。
