镜像对称三元磁流体光子晶体的磁场传感特性

Magnetic Field Sensing Characteristics of Ternary Magnetic Fluid Photonic Crystals with Mirror Symmetry

基于磁流体的折射率可随外磁场的变化而变化，提出利用磁流体M和两种传统的电介质材料H（高折射率介质）和L（低折射率介质）构成镜像对称三元光子晶体结构来实现磁场传感。基于这3种材料构成了6种不同的镜像对称结构。利用传输矩阵法比较研究了它们的磁场传感特性。结果表明，镜像对称光子晶体的缺陷模随结构参数的变化规律基本相同，其探测灵敏度随着磁流体层的厚度和磁性纳米微粒的体积分数的增加而增加。计算结果还表明，与其他镜像对称结构相比，结构（HLM）N （MLH）N具有相对较高的磁场探测灵敏度。该研究结果为实际磁场传感器的设计和制作提供了参考。

The refractive index of the magnetic fluid material can be changed with the external magnetic field, based on which a ternary photonic crystal with the mirror symmetry composed of the magnetic fluid M and two traditional dielectric materials H （high refractive index medium） and L （low refractive index medium） was proposed to achieve magnetic field sensing. Six different mirror symmetrical struc- tures were constructed based on the three materials, and their magnetic field sensing characteristics were investigated by using the transmission matrix method. The results show that the variation rules of the defect modes of the mirror-symmetric photonic crystals with the structural parameters are basically the same, and the detection sensitivity increases with the increases of the thickness of the magnetic fluid layer and the volume fraction of the magnetic nanoparticles. Besides, the calculation results also indicate that the structure of （HLM）N （MLH）N has the highest magnetic field detection sensitivity compared to other mirror-symmetric structures. The research results provide a reference for the design and fabrication of the practical magnetic field sensor.