论文标题

电线谐振器作为宽带Huygens Superscatterer

Wire Resonator as a Broadband Huygens Superscatterer

论文作者

Vovchuk, Dmytro, Kosulnikov, Sergei, Noskov, Roman E., Ginzburg, Pavel

论文摘要

干扰现象通过控制多个散射通道的阶段来塑造电磁波的传播。 Huygens元素是这种方法的代表性示例,可以在向前方向上从对象上增强散射,同时抑制反射。然而,典型的Huygens元素的共振实现采用了电气和磁性偶性共振之间的建设性干扰,从而使其相对狭窄。在这里,我们基于垂直对齐的金属线的圆形阵列,开发了宽带谐振的Huygens元件的概念。在电气小结构中的多极干扰的准确管理导致在大带宽上方向散射,并加速了载体频率的10%。该结构是由非磁性材料构建的,表明在电力对应物上占主导地位的磁多物中出现了强烈的磁反应。此外,我们预测并观察到具有质量因子的非常高的磁性己酮(M16极)和磁性三亚山二酮(M32极)接近6,000。实验演示在低GHz光谱范围内进行。我们的发现揭示了一种简单的方法,用于工程紧凑和开放的电磁设备(天线,方向反射器,折射器等)能够在宽带结构域中量身定制波浪传播,浓缩强磁场并产生高阶磁性多孔。

Interference phenomena render tailoring propagation of electromagnetic waves by controlling phases of several scattering channels. Huygens element, being a representative example of this approach, allows enhancement of the scattering from an object in a forward direction, while the reflection is suppressed. However, a typical resonant realization of Huygens element employs constructive interference between electric and magnetic dipolar resonances that makes it relatively narrowband. Here we develop the concept of a broadband resonant Huygens element, based on a circular array of vertically aligned metal wires. Accurate management of multipole interference in an electrically small structure results in directional scattering over a large bandwidth, acceding 10% of the carrier frequency. Being constructed from non-magnetic materials, this structure demonstrates a strong magnetic response appearing in dominating magnetic multipoles over electric counterparts. Moreover, we predict and observe very high-order magnetic hexadecapole (M16-pole) and magnetic triakontadipole (M32-pole) with quality factors, approaching 6,000. The experimental demonstration is performed at the low GHz spectral range. Our findings shed light on a simple approach for engineering compact and open electromagnetic devices (antennas, directional reflectors, refractors, etc.) able to tailor wave propagation in a broadband domain, concentrate strong magnetic field, and generate high-order magnetic multipoles.

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