Tunable Resonance and Phase Vortices in Kirigami Fano‐Resonant Metamaterials,Advanced Materials Technologies

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Tunable Resonance and Phase Vortices in Kirigami Fano‐Resonant Metamaterials
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-06-03 , DOI: 10.1002/admt.202000234
Hoon Yeub Jeong ₁ , Yeonsoo Lim ₁ , Soo‐Chan An ₁ , Thi Hai‐Yen Nguyen ₂ , Gangil Byun ₂ , Young Chul Jun ₁

Affiliation

Emerging internet‐of‐things technologies require widespread antennas and sensors. They should be cheap enough to be widely deployed, but still should be highly functional and tunable. Here, a thorough, in‐depth study of spectral shifts and phase vortices in kirigami Fano‐resonant metamaterials is presented. Microwave metamaterials are printed on paper using metal inks. Then, the printed metamaterials are cut line‐by‐line and folded, so that a step height between neighboring unit cells can be created. By varying step heights, significant spectral tuning as well as resonance switching are obtained. The large spectral shift of the highly asymmetric Fano lineshape also enables significant control of radiation direction. The observations are explained based on the interactions between neighboring unit cells. Moreover, phase singularities are found at the zero‐amplitude position of the Fano resonance spectrum, and a pair of phase vortices appear in parameter space. The kirigami metamaterials allow an easy parameter scan, and therefore significant control of the spectral phase becomes possible. Such drastic phase changes around singularity points could be very useful for various applications, including optical sensing and wavefront manipulation. The kirigami metamaterials enable easily fabricated but highly functional and tunable elements, which could be useful for various antennas and sensors.

中文翻译：

Kirigami Fano共振超材料中的可调共振和相涡旋。

新兴的物联网技术需要广泛的天线和传感器。它们应该便宜到足以被广泛部署，但仍应具有很高的功能和可调性。在这里，我们对kirigami Fano共振超材料中的光谱位移和相涡进行了深入，深入的研究。微波超材料使用金属墨水印刷在纸上。然后，将打印的超常材料逐行切割并折叠，以便可以在相邻单位单元之间创建台阶高度。通过改变台阶高度，可以获得显着的频谱调谐以及共振切换。高度不对称的Fano线形的大光谱偏移还可以有效控制辐射方向。基于相邻单位单元之间的相互作用来解释观察结果。此外，在Fano共振频谱的零振幅位置发现相位奇异点，并且在参数空间中出现一对相位涡旋。kirigami超材料可以轻松进行参数扫描，因此可以有效控制光谱相位。这种奇异点周围的剧烈相位变化对于包括光学传感和波前操纵在内的各种应用可能非常有用。kirigami超材料可轻松制造但功能强大且可调谐的元件，可用于各种天线和传感器。这种奇异点周围的剧烈相位变化对于包括光学传感和波前操纵在内的各种应用可能非常有用。kirigami超材料可轻松制造但功能强大且可调谐的元件，可用于各种天线和传感器。这种奇异点周围的剧烈相位变化对于包括光学传感和波前操纵在内的各种应用可能非常有用。kirigami超材料可以轻松制造但功能强大且可调的元件，可用于各种天线和传感器。

更新日期：2020-08-10

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