We propose a simple magnetic field sensor based on a hexagonal photonic crystal fiber (PCF) and magnetic fluid (Fe₃O₄). The simulation study has been carried out using the finite element method (FEM). The optical parameters such as birefringence, coupling length, power spectrum, and transmission intensity have been analyzed. The performance of the proposed sensor has been evaluated by tracing the optical features of wavelength sensitivity, linear regression, and resolution of the sensor. The obtained sensitivities and resolution are 370 pm/Oe, 0.1503 um/Oe, and 8.53 Oe, respectively. The designed sensing structure illustrates a simple shape, low cost, and high sensitivity device that could be a suitable candidate for sensing the magnetic field in many applications.

我们提出了一种基于六方光子晶体光纤（PCF）和磁性流体（Fe ₃ O ₄）的简单磁场传感器。使用有限元法（FEM）进行了模拟研究。分析了双折射、耦合长度、功率谱和传输强度等光学参数。通过追踪传感器的波长灵敏度、线性回归和分辨率的光学特征来评估所提出的传感器的性能。获得的灵敏度和分辨率分别为370  pm/Oe、0.1503 um/Oe和8.53  Oe。设计的传感结构展示了一种形状简单、成本低且灵敏度高的设备，可能是许多应用中传感磁场的合适候选者。