Exceptional compound plasmon-polariton waves
Exceptional compound plasmon-polariton waves
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DOI：
10.1364/osac.405370
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发表时间：
2020-09
期刊：
影响因子：
1.6
通讯作者：
A. Lakhtakia;Chenzhang Zhou;T. Mackay
中科院分区：
文献类型：
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作者：
A. Lakhtakia;Chenzhang Zhou;T. Mackay
通常，包括插入在两个均匀电介质材料之间的足够薄的金属膜的三材料结构引导复合等离子体激元-极化激元（CPP）波，对于该复合等离子体激元-极化激元（CPP）波，金属膜两侧上的场随着离最近的金属/电介质界面的距离而指数衰减。然而，如果电介质材料之一是各向异性的，则三材料结构可以引导针对特定传播方向的异常CPP波。在由各向异性介电材料占据的金属膜的一侧上，例外CPP波的场衰减为与最近的金属/介电界面的距离的线性函数和指数函数的乘积。对CPP波传播的正则边值问题进行了分析和数值求解，从而建立了单轴电介质/金属/各向同性电介质结构中特殊CPP波的空间场分布。
Ordinarily, a trimaterial structure comprising a sufficiently thin metal film interposed between two homogeneous dielectric materials guides compound plasmon-polariton (CPP) waves, for which the fields on both sides of the metal film decay exponentially with distance from the nearest metal/dielectric interface. However, if one of the dielectric materials is anisotropic then the trimaterial structure can guide an exceptional CPP wave for a particular propagation direction. On the side of the metal film occupied by the anisotropic dielectric material, the fields of the exceptional CPP wave decay as the product of a linear function and an exponential function of the distance from the nearest metal/dielectric interface. The canonical boundary-value problem for CPP-wave propagation has been analyzed and solved numerically; thereby, the spatial field profiles for exceptional CPP waves for a uniaxial-dielectric/metal/isotropic-dielectric structure have been established.