基于磁流体的一维光子晶体磁场传感器的研究

Study on the 1D photonic crystal magnetic field sensor based on magnetic fluids

基于磁流体的折射率对外加变化磁场的敏感特性,提出将磁流体作为缺陷层引入到一维光子晶体中实现磁场传感。由于缺陷的存在,使得光子晶体的透射谱中产生缺陷峰。该传感器可通过测量磁场变化时光子晶体缺陷模波长的移动对相应的磁场进行测量。利用传输矩阵法对不同结构参数下,缺陷模波长随在外加磁场的变化进行了模拟计算,为实际磁场传感器的设计提供了理论参考。

The tunable refractive index of the magnetic fluid is a unique optical property, which has attracted a lot of research interest in the magnetic field sensing in recent years. Based on this property, the magnetic fluid is introduced into the one-dimensional photonic crystal as the defective layer to realize the magnetic field sensing. Because of the defect, the defect peak appears in the transmission spectra of the defective photonic crystal. According to sensitivity of the refractive index in the magnetic field, the defect peak of photonic crystal varies when the magnetic changes, so the magnetic can be measured by the wavelength shift value of the defect peak. Using the transfer matrix method, the de- fect peak is simulated with the change of the applied magnetic field under different structural parameters. This pro- vides a theoretical basis for the practical application of defective one-dimensional photonic crystal sensor in magnetic measurement.