Optical cloaking with metamaterials
Optical cloaking with metamaterials
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DOI：
10.1038/nphoton.2007.28
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发表时间：
2007-04-01
期刊：
影响因子：
35
通讯作者：
Shalaev, Vladimir M.
中科院分区：
文献类型：
--
作者：
Cai, Wenshan;Chettiar, Uday K.;Shalaev, Vladimir M.
人工结构的超材料在操纵电磁波和产生新功能方面具有前所未有的灵活性，包括基于坐标变换的隐形斗篷（1-3）。与其他通常局限于亚波长物体的隐形方法（4-6）不同，转换方法允许设计使宏观物体不可见的隐形装置。此外，这种设计对被遮蔽的物体不敏感。这种斗篷在微波频率上的第一次实验演示最近被报道(7)。然而，我们注意到，这种设计(7)不能用于光学斗篷，这当然是特别有趣的，因为光学频率是“隐形”这个词的传统定义。在这里，我们提出了一种在光学频率下工作的非磁性斗篷的设计。分析了所提出的圆柱斗篷的原理和结构，并给出了实现该装置的一般配方。
Artificially structured metamaterials have enabled unprecedented flexibility in manipulating electromagnetic waves and producing new functionalities, including the cloak of invisibility based on coordinate transformation(1-3). Unlike other cloaking approaches(4-6), which are typically limited to subwavelength objects, the transformation method allows the design of cloaking devices that render a macroscopic object invisible. In addition, the design is not sensitive to the object that is being cloaked. The first experimental demonstration of such a cloak at microwave frequencies was recently reported(7). We note, however, that that design(7) cannot be implemented for an optical cloak, which is certainly of particular interest because optical frequencies are where the word 'invisibility' is conventionally defined. Here we present the design of a non-magnetic cloak operating at optical frequencies. The principle and structure of the proposed cylindrical cloak are analysed, and the general recipe for the implementation of such a device is provided.