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1维镜像磁光光子晶体中的缺陷模分裂
Defect-mode splitting in 1-D mirror magneto-optical photonic crystal
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摘要: 为了研究镜像磁光光子晶体在外磁场中透射谱的变化,采用44传输矩阵法进行了理论分析和模拟计算。模拟结果显示,当外磁场存在的情况下,镜像光子晶体中存在的缺陷模会受到外磁场和光子晶体层数的影响,分裂成两个模式,这两个模式分别对应于原线性偏振光中的左旋光和右旋光,且左旋光和右旋光之间的频率差会随着外加磁场的增强而增大;只有当光子晶体结构多于7层时,缺陷模才会具有较高的Q值,这时模式的分裂现象才能被清晰地观察到。结果表明,磁光光子晶体的这种可调谐性可以应用到新型的滤波器设计当中。Abstract: In order to explore change of transmission spectrum of magneto-optical photonic crystal in external magnetic field, theoretical analysis and simulation calculation were carried out based on 44 transfer matrix method. Simulation results illustrated that when external magnetic field exists, the defect-mode of mirror photonic crystal would split into two modes under the effect of external magnetic field and the number of photonic crystal layers. And two modes are corresponding to the left-hand and the right-hand circular polarization waves respectively. The frequency difference between the left-hand and the right-hand circular polarization waves increases with the increase of external magnetic field. Only when photonic crystal layers are more than seven layers, defect-mode could have high Q value, which means defect-mode splitting can be clearly observed. The tunable feature of magneto-optical photonic crystal can be applied to design new filters.
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