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arXiv physics/0310011physics.optics
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间隔周期阵列中电磁波的双共振极不对称散射

Double-resonant extremely asymmetrical scattering of electromagnetic waves in periodic arrays separated by a gap

D. K. Gramotnev, T. A. Nieminen

摘要:

两个强烈的同时共振散射-双共振极不对称散射(DEAS)-预测在两个平行的,倾斜的,周期性的布拉格阵列分开的间隙,当散射波平行于阵列传播。这些共振之一是相对于频率(这是常见的所有类型的布拉格散射),另一个是相对于阵列之间的相位变化。散射波的衍射发散被证明是DEAS在所考虑的结构中的主要物理原因。虽然阵列是分开的,它们被示出相互作用的衍射发散的散射波跨越间隙从一个阵列到另一个。它还表明,增加两个阵列之间的分离的结果在一个更广泛和更弱的谐振相对于相移。分析是基于最近开发的新方法,允许阵列内外的散射波的衍射发散。物理解释的DEAS分离阵列的预测功能。适用条件的理论推导。

英文摘要:

Two strong simultaneous resonances of scattering--double-resonant extremely asymmetrical scattering (DEAS)--are predicted in two parallel, oblique, periodic Bragg arrays separated by a gap, when the scattered wave propagates parallel to the arrays. One of these resonances is with respect to frequency (which is common to all types of Bragg scattering), and another is with respect to phase variation between the arrays. The diffractional divergence of the scattered wave is shown to be the main physical reason for DEAS in the considered structure. Although the arrays are separated, they are shown to interact by means of the diffractional divergence of the scattered wave across the gap from one array into the other. It is also shown that increasing separation between the two arrays results in a broader and weaker resonance with respect to phase shift. The analysis is based on a recently developed new approach allowing for the diffractional divergence of the scattered wave inside and outside the arrays. Physical interpretations of the predicted features of DEAS in separated arrays are also presented. Applicability conditions for the developed theory are derived.

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