Large scale cylindrical cloak in free space without superluminal propagation

2012 International Workshop on Metamaterials (Meta) Pub Date : 2012-10-01 DOI:10.1109/META.2012.6464937

Hongsheng Chen, Su Xu, Baile Zhang, Runren Zhang, H. Moser, Zhi Shen, Yang Xu, Xianmin Zhang

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Abstract

Despite its remarkably fast development in the past few years, the technology of invisibility cloaking is still facing many serious bottlenecks, e.g. the bandwidth, the superluminal limitation, dispersion, loss, etc. In this paper, we experimentally demonstrated an alternative approach of invisibility cloaking that can combine technical advantages of all current major cloaking strategies in a unified manner and thus can solve bottlenecks of individual strategies. A broadband cylindrical invisibility cloak in free space is designed based on scattering cancellation (the approach of previous plasmonic cloaking), and implemented with anisotropic metamaterials (a unique property of previous transformation-optics cloaking). Particularly, non-superluminal speed of light in the cloak, a superior advantage of non-Euclidian conformal mapping cloaks, is inherited in this design, and thus is the reason of its relatively broad bandwidth. This demonstration provides a possibility for future practical implementation of cloaking devices at large scales.

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无超光速传播的自由空间大尺度圆柱形斗篷

尽管近年来隐身技术发展迅速，但仍面临着带宽、超光速限制、色散、损耗等诸多瓶颈问题。在本文中，我们通过实验证明了一种隐形隐形的替代方法，该方法可以统一地结合当前所有主要隐身策略的技术优势，从而解决单个策略的瓶颈。基于散射抵消方法(等离子体隐身方法)设计了一种自由空间宽带圆柱形隐身斗篷，并利用各向异性超材料(变换光学隐身的独特特性)实现了该隐身斗篷。特别地，这种设计继承了非欧几里得保角映射斗篷的优势，即斗篷中的非超光速光速，这也是其带宽相对较宽的原因。该演示为未来大规模隐身装置的实际实现提供了可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 International Workshop on Metamaterials (Meta)

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