Broadband cloaking and mirages with flying carpets.
Broadband cloaking and mirages with flying carpets.
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DOI：
10.1364/oe.18.011537
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发表时间：
2009-12
期刊：
影响因子：
3.8
通讯作者：
A. Diatta;G. Dupont;S. Guenneau;S. Enoch
中科院分区：
文献类型：
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作者：
A. Diatta;G. Dupont;S. Guenneau;S. Enoch
本文扩展了 Li 和 Pendry [Phys.莱特牧师。 101, 203901-4 (2008)]用于无限导电平面和圆柱体（或在可压缩流体中传播的声波的情况下的刚性平面和圆柱体）的隐形地毯。这里考虑的地毯不接触地面：它们悬浮在半空中（或漂浮在水中），这导致隐藏在下面的物体近似隐形，或者接触地面上或上方的方形圆柱体的两侧。连接到方形圆柱体侧面的帐篷状地毯说明了墙上地毯的概念如何自然地推广到其他小型紧凑物体的侧面。然后，我们将飞毯的概念扩展到圆柱体，并表明人们可以在这种圆形飞毯下隐藏任何类型的缺陷，但它们仍然像较小的圆柱体一样散射波。有趣的是，所有这些地毯都是通过非奇异参数来描述的。为了举例说明这一重要方面，我们提出了一种由各向同性均匀介电环（或具有恒定体积模量和不同密度的流体）组成的多层地毯，其在有限的波长范围内工作。
This paper extends the proposal of Li and Pendry [Phys. Rev. Lett. 101, 203901-4 (2008)] to invisibility carpets for infinite conducting planes and cylinders (or rigid planes and cylinders in the context of acoustic waves propagating in a compressible fluid). Carpets under consideration here do not touch the ground: they levitate in mid-air (or float in mid-water), which leads to approximate cloaking for an object hidden underneath, or touch either sides of a square cylinder on, or over, the ground. The tentlike carpets attached to the sides of a square cylinder illustrate how the notion of a carpet on a wall naturally generalizes to sides of other small compact objects. We then extend the concept of flying carpets to circular cylinders and show that one can hide any type of defects under such circular carpets, and yet they still scatter waves just like a smaller cylinder on its own. Interestingly, all these carpets are described by non-singular parameters. To exemplify this important aspect, we propose a multi-layered carpet consisting of isotropic homogeneous dielectrics rings (or fluids with constant bulk modulus and varying density) which works over a finite range of wavelengths.