不均匀场中静磁波的传播和导波光衍射效应

Propagation of Magnetostatic Waves and Diffraction Effect of Guided Optical Waves under Nonuniform Bias Magnetic Field

理论分析了磁光薄膜中垂直不均匀静磁场对静磁波以及导波光衍射效率的影响，并以抛物线分布的不均匀磁场为例对Ｂｉ∶ＹＩＧ薄膜波导进行了计算．计算表明，在适当分布的不均匀场作用下，与均匀磁场情形相比，波导中传播的静磁波振幅以及导波光的衍射效率都有显著增加．

The propagation characteristics of magnetostatic waves(MSWs) and the diffraction efficiency(DE) of guided optical waves(GOWs) under normal nonuniform bias magnetic field in magnetooptical film are theoretically studied. The dynamic magnetization in Bi∶YIG film and the DE of GOWs under the nonuniform field of parabolic profile are calculated in detail. The calculation results indicate that, by comparison to the case of uniform magnetization, MSW amplitude and the DE of the GOWs under nonuniform bias field of appropriate profile are distinctly increased.