An effective method for improving diffraction performance of magnetostatic backward volume wave-based magneto-optic Bragg cells by using an appropriately tilted bias magnetic field in YIG film plane
An effective method for improving diffraction performance of magnetostatic backward volume wave-based magneto-optic Bragg cells by using an appropriately tilted bias magnetic field in YIG film plane
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DOI：
10.1016/j.jmmm.2005.11.013
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发表时间：
2006-08
影响因子：
2.7
通讯作者：
Baojian Wu;Kun Qiu
中科院分区：
文献类型：
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作者：
Baojian Wu;Kun Qiu
首次给出了任意倾斜偏置磁场下静磁波和导光波的通用磁光耦合模方程，并将其应用于钇铁石榴石（YIG）薄膜中单元件微带线换能器激发的静磁后向体波与TE 0模入射光的非共线Stokes相互作用.计算结果表明，在磁化方向平行于MSBWW传播方向的情况下，衍射效率（DE）等于衍射光的模式转换效率（MCDE），计算得到的纯YIG波导中MSBWW基MO布拉格盒的相对DE曲线与实验数据符合得很好。通过优化偏置磁场可以大大提高衍射性能，切向磁化薄膜衍射增益提高了6.3dB。文中还讨论了衍射强度和相应的布喇格角随磁化方向的变化关系。
The universal magneto-optic (MO) coupled-mode equations for magnetostatic waves (MSWs) and guided optical waves (GOWs) under arbitrarily tilted bias magnetic fields are presented for the first time and, as an example, applied to the noncollinear Stokes interaction between the incident TE0-mode light and magnetostatic backward volume wave (MSBVW) excited by single-element microstrip line transducer in yttrium–iron–garnet (YIG) film. Our calculation indicates that, for the case of magnetization parallel to the MSBVW propagation direction, the diffraction efficiency (DE) is equal to the mode-conversion efficiency of the diffracted lights (MCDE) and the calculated curve of relative DE for the MSBVW-based MO Bragg cell in pure YIG waveguide is in good agreement with the experimental data. In contrast, the diffraction performance can be greatly improved by optimizing the bias magnetic field and the DE gain can be increased by 6.3dB in the tangentially magnetized film. The angular dependences of the DE and the corresponding Bragg angle upon the magnetization direction are also discussed in the paper.