Electromagnetic Funnel: Reflectionless Transmission and Guiding of Waves through Subwavelength Apertures.,Physical Review Letters

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Electromagnetic Funnel: Reflectionless Transmission and Guiding of Waves through Subwavelength Apertures.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.033901
Nasim Mohammadi Estakhri ₁ , Nader Engheta ₁ , Raphael Kastner _{1,

2}

Affiliation

Confining and controlling electromagnetic energy typically involves a highly resonant phenomenon, especially when subwavelength confinement is desired. Here, we present a class of nonresonant, self-dual planar metastructures capable of protected energy transmission from one side to the other, through arbitrarily narrow apertures. It is shown that the transmission is in the form of matched propagating modes and is independent of the thickness and specific composition of the surface. We analytically prove that the self-dual condition is sufficient to guarantee 100% transmission that is robust to the presence of discontinuities along the propagation path. The results are confirmed numerically through study of various scenarios. The operation is broadband and subject only to the bandwidth of the constituent materials. The polarization of the internal field can also be independently controlled with respect to the incident one. Our structures are promising for applications in sensing, particle trapping, near-field imaging, and wide scan antenna arrays.

中文翻译：

电磁漏斗：通过亚波长孔径的波的无反射传输和引导。

限制和控制电磁能通常会引起高度共振现象，尤其是在需要亚波长限制时。在这里，我们提出了一类非共振的，自我对偶的平面亚结构，能够通过任意狭窄的孔径来保护能量从一侧传递到另一侧。结果表明，透射是匹配的传播模式，并且与表面的厚度和特定成分无关。我们通过分析证明，自我对偶条件足以保证100％的传输，这对于沿传播路径存在不连续性是稳健的。通过对各种情况的研究，对结果进行了数值确认。该操作是宽带的，并且仅取决于组成材料的带宽。内部场的极化也可以相对于入射场独立地控制。我们的结构有望用于传感，粒子捕获，近场成像和宽扫描天线阵列。

更新日期：2020-01-23

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