An ultrathin invisibility skin cloak for visible light
An ultrathin invisibility skin cloak for visible light
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DOI：
10.1126/science.aac9411
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发表时间：
2015-09-18
期刊：
影响因子：
56.9
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Ni, Xingjie;Wong, Zi Jing;Zhang, Xiang
到目前为止，基于超材料的光学斗篷利用材料性质的体积分布来逐渐弯曲光，从而遮盖住被遮盖的区域。因此，它们体积庞大，难以放大，更关键的是，典型的地毯斗篷在反射光中引入了不必要的相移，使斗篷可被检测到。在这里，我们通过实验演示了一种包裹在物体上的超薄隐形皮肤斗篷。这种皮肤斗篷通过完全恢复730纳米波长的反射光的相位，隐藏了一个三维的任意形状的物体。皮肤斗篷包括一个具有分布相移的变形表面，改变光线的路径并使对象不可见。与体积折射率变化的笨重斗篷相比，我们的装置只有80纳米(约为波长的九分之一)厚，可以隐藏宏观物体。
Metamaterial-based optical cloaks have thus far used volumetric distribution of the material properties to gradually bend light and thereby obscure the cloaked region. Hence, they are bulky and hard to scale up and, more critically, typical carpet cloaks introduce unnecessary phase shifts in the reflected light, making the cloaks detectable. Here, we demonstrate experimentally an ultrathin invisibility skin cloak wrapped over an object. This skin cloak conceals a three-dimensional arbitrarily shaped object by complete restoration of the phase of the reflected light at 730-nanometer wavelength. The skin cloak comprises a metasurface with distributed phase shifts rerouting light and rendering the object invisible. In contrast to bulky cloaks with volumetric index variation, our device is only 80 nanometer (about one-ninth of the wavelength) thick and potentially scalable for hiding macroscopic objects.