A High-Sensitivity SPR Sensor Based on MMF-Tapered HCF-MMF Fiber Structure for Refractive Index Sensing
A High-Sensitivity SPR Sensor Based on MMF-Tapered HCF-MMF Fiber Structure for Refractive Index Sensing
复制标题
DOI：
10.1109/jsen.2022.3201154
复制
发表时间：
2022-10
影响因子：
4.3
通讯作者：
Chuanxin Teng;Maosen Li;Rui Min;S. Deng;Ming Chen;Minmin Xue;Libo Yuan;Hongchang Deng
中科院分区：
文献类型：
--
作者：
Chuanxin Teng;Maosen Li;Rui Min;S. Deng;Ming Chen;Minmin Xue;Libo Yuan;Hongchang Deng
本文提出了一种基于多模光纤(MMF)-锥形空心芯光纤(THCF)-MMF结构的高灵敏度表面等离子体共振（SPR）传感器，用于折射率（RI）传感。随着测量RI的增大，SPR峰右移，SPR峰前可见波长也会出现多模干涉（MMI）谱，MMI共振波长随RI的增大而左移。通过监测MMI波长与SPR峰之间的共振波长差，可以检测到RI的变化，这是一种测量RI的新方法。研究了不同锥度比和不同HCF芯直径的传感器探头的RI传感性能。实验结果表明，大锥度比的MMF-THCF-MMF探针在大RI下可以显著提高灵敏度。对于HCF芯径为$30 ~\mu \text{m}$、锥度比为3.3的探针，在RI为1.40时获得了7592.25 nm/RIU的高RI灵敏度。该传感器制作方便，结构简单，在生化传感领域具有潜在的应用前景。
In this article, a high-sensitivity surface plasmon resonance (SPR) sensor based on multimode fiber (MMF)-tapered hollow core fiber (THCF)-MMF structure is fabricated and proposed for refractive index (RI) sensing. As the measurement RI increases, the SPR peak right shifts, a multimode interference (MMI) spectrum will also appear in the visible wavelength in front of the SPR peak, and the MMI resonance wavelength left shifts with the RI increases. The RI changes can be detected by monitoring the resonance wavelength difference between the MMI wavelength and the SPR peak, which is a new method used to measure the RI. The RI sensing performance for the proposed sensor probes with different taper ratios and different HCF core diameters is explored. The experimental results show that the sensitivity could be significantly improved at large RI for the MMF-THCF-MMF probe with a large taper ratio. For the probe with an HCF core diameter of $30 ~\mu \text{m}$ and a taper ratio of 3.3, a high RI sensitivity of 7592.25 nm/RIU is obtained at the RI of 1.40. The proposed SPR sensor is easily fabricated and has a simple structure, which has potential applications in biochemical sensing fields.