Al Noman Abdullah, Dash Jitendra Narayan, Cheng Xin, Tam Hwa-Yaw, Yu Changyuan
Opt Express. 2022 Feb 14;30(4):4895-4904. doi: 10.1364/OE.447272.
A compact, reliable, and fast responsive PCF (photonic crystal fiber) based modal interferometric sensor for lead ion detection is proposed and experimentally demonstrated. The sensor has been fabricated by splicing a small section of PCF with SMF (single mode fiber) followed by collapsing the air holes of PCF at its tip. The interferometer is dip coated with chitosan-PVA (polyvinyl alcohol) and glutathione functionalized gold nanoparticles. Three probes have been fabricated, and the maximum sensitivity has been found to be 0.031 nm/ppb for lead ions whereas the detection range has been considered from 0 ppb to 50 ppb. The probe has been found to have a faster response time of ∼ 10 s. Furthermore, the sensor has been found to be less responsive towards other heavy metal ions, thereby demonstrating its selectivity towards lead ions. Besides, a section of FBG (fiber Bragg grating) has been embedded into the interferometer and the temperature response of FBG peak along with interference spectra has been investigated for better accuracy.
提出并通过实验证明了一种基于紧凑型、可靠且响应快速的光子晶体光纤（PCF）的模态干涉式铅离子检测传感器。该传感器通过将一小段光子晶体光纤与单模光纤（SMF）拼接，然后在其尖端使光子晶体光纤的气孔塌陷来制造。干涉仪浸涂有壳聚糖 - 聚乙烯醇（PVA）和谷胱甘肽功能化的金纳米粒子。制备了三种探头，发现对铅离子的最大灵敏度为0.031 nm/ppb，检测范围为0 ppb至50 ppb。该探头的响应时间约为10 s，响应速度更快。此外，发现该传感器对其他重金属离子的响应较小，从而证明了其对铅离子的选择性。此外，将一段光纤布拉格光栅（FBG）嵌入干涉仪中，并研究了FBG峰值的温度响应以及干涉光谱，以提高精度。
