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首页> 外文期刊>Physical review >Array of dipoles near a hyperbolic metamaterial: Evanescent-to-propagating Floquet wave transformation
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Array of dipoles near a hyperbolic metamaterial: Evanescent-to-propagating Floquet wave transformation

机译：双曲超材料附近的偶极子阵列：van逝传播的浮球波变换

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摘要

We investigate the capabilities of hyperbolic metamaterials (HMs) to couple near-fields (i.e., evanescent waves) emitted by a two-dimensional periodic array of electric dipoles to propagating waves. In particular, large-order Floquet harmonics with transverse-magnetic polarization that would be evanescent in free space, and therefore confined near the array surface, are transformed into a propagating spectrum inside the HM and thus carry power away. Because of this property, independent of the finite or infinite extent of the HM, the power generated by an array of elementary electric dipoles is strongly enhanced and is mostly directed into the HM when the array is located near a HM surface. In particular, the power coupled to the HM exhibits narrow frequency features that can be employed in detection applications. The results shown in this paper provide a clear signature on wave dynamics in HMs. A link between the results pertaining to the case of an isolated dipole on top of HM and the planar array is found to be convenient in explaining both wave dynamics and spectral power distribution. The narrow frequency emission features appear in the array case only; they depend on its spatial periodicity and remarkably on the HM thickness.
机译：我们研究了双曲超材料（HMs）将电偶极子的二维周期性阵列发射的近场（即e逝波）耦合到传播波的能力。尤其是，具有横向磁极化的大阶Floquet谐波在自由空间中会逐渐消失，因此仅限于阵列表面，被转换为HM内部的传播频谱，从而将功率带走。由于此特性，与HM的有限或无限范围无关，由基本电偶极子阵列产生的功率会大大增强，并且当该阵列位于HM表面附近时，大部分功率将被导入HM。尤其是，耦合到HM的功率表现出可在检测应用中采用的窄频特征。本文显示的结果为HM中的波动力学提供了清晰的特征。发现与在HM上方的隔离偶极子的情况有关的结果与平面阵列之间的联系可以方便地解释波动力学和频谱功率分布。窄频率发射特征仅在阵列情况下出现；它们取决于其空间周期性，并明显取决于HM厚度。

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