Resonant electromagnetic scattering in anisotropic layered media
Resonant electromagnetic scattering in anisotropic layered media
复制标题
各向异性层状介质中的共振电磁散射
DOI：
10.1063/1.4824686
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发表时间：
2013
影响因子：
1.3
通讯作者：
A. Welters
中科院分区：
文献类型：
--
作者：
S. Shipman;A. Welters
由外部辐射引起的板结构的电磁导模的共振激发导致异常散射行为，包括尖锐的能量传输异常和在板模式的频率附近的场放大。在周期性分层的环境介质的情况下，各向异性用于将板模式耦合到辐射。散射现象的精确表达式证明了通过分析的极点的完整的散射矩阵，因为它移动的真实的频率轴下半复平面平行于平板的波矢量的失谐。真实的极点是理想（无限Q）导模的频率，其随着频率获得虚部而变得有损耗。这项工作扩展了希普曼和Venakides的结果倏逝源领域和二维平行波矢量和演示的例子，后者如何允许一个独立控制的宽度和中心频率的共振通过改变入射角的源.
The resonant excitation of an electromagnetic guided mode of a slab structure by exterior radiation results in anomalous scattering behavior, including sharp energy-transmission anomalies and field amplification around the frequency of the slab mode. In the case of a periodically layered ambient medium, anisotropy serves to couple the slab mode to radiation. Exact expressions for scattering phenomena are proved by analyzing a pole of the full scattering matrix as it moves off the real frequency axis into the lower half complex plane under a detuning of the wavevector parallel to the slab. The real pole is the frequency of a perfect (infinite Q) guided mode, which becomes lossy as the frequency gains an imaginary part. This work extends results of Shipman and Venakides to evanescent source fields and two-dimensional parallel wavevector and demonstrates by example how the latter allows one to control independently the width and central frequency of a resonance by varying the angle of incidence of the source...