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Broadband electromagnetic cloaking with smart metamaterials.

机译:带有智能超材料的宽带电磁隐身。

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摘要

The ability to render objects invisible with a cloak that fits all objects and sizes is a long-standing goal for optical devices. Invisibility devices demonstrated so far typically comprise a rigid structure wrapped around an object to which it is fitted. Here we demonstrate smart metamaterial cloaking, wherein the metamaterial device not only transforms electromagnetic fields to make an object invisible, but also acquires its properties automatically from its own elastic deformation. The demonstrated device is a ground-plane microwave cloak composed of an elastic metamaterial with a broad operational band (10-12 GHz) and nearly lossless electromagnetic properties. The metamaterial is uniform, or perfectly periodic, in its undeformed state and acquires the necessary gradient-index profile, mimicking a quasi-conformal transformation, naturally from a boundary load. This easy-to-fabricate hybrid elasto-electromagnetic metamaterial opens the door to implementations of a variety of transformation optics devices based on quasi-conformal maps.
机译:用适合所有物体和大小的斗篷使​​物体不可见的能力是光学设备的长期目标。迄今为止展示的隐形装置通常包括包裹在其所安装的物体周围的刚性结构。在这里,我们演示了智能超材料的伪装,其中超材料设备不仅转换电磁场以使对象不可见,而且还通过其自身的弹性变形自动获取其属性。演示的设备是一种地平面微波斗篷,由具有超宽工作频带(10-12 GHz)和几乎无损电磁特性的弹性超材料构成。超材料在其未变形状态下是均匀的或完全周期性的,并且自然地从边界载荷中获得了必要的梯度指数分布,从而模仿了准保形变换。这种易于制造的混合弹性电磁超材料为基于准保形图的各种变换光学器件的实现打开了大门。

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