A kind of reflective vector magnetic field sensor with wedge-shaped fiber tip based on surface plasmon resonance (SPR) and magnetic fluid (MF) has been fabricated and investigated. Multimode fiber (MMF) and few-mode fiber (FMF) were grinded and polished to get the wedge-shaped fiber tip, which was then plated with nanoscale gold film for exciting SPR. The as-fabricated tip was immersed in MF, which was used as the magnetic field sensitive material. Experimental results show that the magnetic field intensity and direction sensitivities of the magnetic field sensors based on MMF and FMF are 2317 pm/mT, 497 pm/° and 6776 pm/mT, 2313 pm/° respectively, which proves that the proposed sensor based on wedge-shaped fiber tip has great potential for realizing lab-on-fiber devices and applications.

制造并研究了一种基于表面等离子体共振 (SPR) 和磁流体 (MF) 的楔形光纤尖端反射矢量磁场传感器。多模光纤 (MMF) 和少模光纤 (FMF) 被研磨和抛光以获得楔形光纤尖端，然后镀上纳米级金膜以激发 SPR。将制成的尖端浸入 MF 中，用作磁场敏感材料。实验结果表明，基于MMF和FMF的磁场传感器的磁场强度和方向灵敏度分别为2317 pm/mT、497 pm/°和6776 pm/mT、2313 pm/°，证明了所提出的传感器基于在楔形光纤尖端上的研究具有实现光纤实验室设备和应用的巨大潜力。