Analysis of phase mismatch in magneto-optic Bragg diffraction
Analysis of phase mismatch in magneto-optic Bragg diffraction
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DOI：
10.7498/aps.55.3095
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发表时间：
2006-06
期刊：
影响因子：
--
通讯作者：
W. Bao-jian
中科院分区：
文献类型：
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作者：
W. Bao-jian
推导了位相失配条件下静磁波(MSW)和导光波(GOW)的磁光耦合模方程，并将其应用于采用单元件微带线换能器的斜磁化YIG薄膜中与静磁后向体波(MSBVW)的非共线相互作用。计算了入射TE0模光的衍射效率。对于磁化强度沿MSBVW传播方向的情况，计算结果与实验数据吻合较好。相反，使用适当倾斜的偏置磁场可以使DE提高6dB，并且对磁化方向改变引起的位相失配不敏感。因此，优化Bais磁场方向是改善Bragg盒衍射性能和增加其MO带宽的有效方法。
The magneto-optic (MO) coupled-mode equations for magnetostatic waves (MSWs) and guided optical waves (GOWs) under phase-mismatch conditions were deduced and applied to the noncollinear interaction with magnetostatic backward volume waves (MSBVWs) in obliquely magnetized yttrium-iron-garnet (YIG) film using single-element microstrip line transducer. The diffraction efficiency (DE) of the incident TE 0 -mode light was calculated. For the case of magnetization along the MSBVW propagation direction, the calculated results are in good agreement with the experimental data. In contrast, by using an appropriately tilted bias magnetic field the DE can be increased by 6dB and is insensitive to the phase mismatch induced by the change of magnetization direction. Thus, the optimization of the direction of the bais magnetic field is an effective method for improving the diffraction performance and increasing the MO bandwidth of the Bragg cells.