周期光栅中波的非稳态极非对称散射
Non-steady-state extremely asymmetrical scattering of waves in periodic gratings
摘要：
极不对称散射（EAS）是一种高度共振的布拉格散射，其散射波振幅在光栅内外都有强烈的共振增加。当散射波平行于光栅边界传播时，实现EAS。我们提出了一个严格的算法来分析非稳态EAS，并研究了入射和散射波振幅的松弛到其稳态值。分析了体TE电磁波在窄、宽、倾斜全息光栅中的非稳态EAS。典型的弛豫时间的确定和比较与以前的粗略估计。物理解释的预测效果。
英文摘要：
Extremely asymmetrical scattering (EAS) is a highly resonant type of Bragg scattering with a strong resonant increase of the scattered wave amplitude inside and outside the grating. EAS is realized when the scattered wave propagates parallel to the grating boundaries. We present a rigorous algorithm for the analysis of non-steady-state EAS, and investigate the relaxation of the incident and scattered wave amplitudes to their steady-state values. Non-steady-state EAS of bulk TE electromagnetic waves is analyzed in narrow and wide, slanted, holographic gratings. Typical relaxation times are determined and compared with previous rough estimations. Physical explanation of the predicted effects is presented.
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