Zhu Jianfei, Jiang Wei, Liu Yichao, Yin Ge, Yuan Jun, He Sailing, Ma Yungui
State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China.
Department of Electromagnetic Engineering, School of Electrical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden.
Nat Commun. 2015 Nov 24;6:8931. doi: 10.1038/ncomms9931.
Invisible cloaking is one of the major outcomes of the metamaterial research, but the practical potential, in particular for high frequencies (for example, microwave to visible light), is fatally challenged by the complex material properties they usually demand. On the other hand, it will be advantageous and also technologically instrumental to design cloaking devices for applications at low frequencies where electromagnetic components are favourably uncoupled. In this work, we vastly develop the bilayer approach to create a three-dimensional magnetic cloak able to work in both static and dynamic fields. Under the quasi-static approximation, we demonstrate a perfect magnetic cloaking device with a large frequency band from 0 to 250 kHz. The practical potential of our device is experimentally verified by using a commercial metal detector, which may lead us to having a real cloaking application where the dynamic magnetic field can be manipulated in desired ways.
隐形斗篷是超材料研究的主要成果之一，但其实用潜力，特别是在高频（例如，从微波到可见光）情况下，受到其通常所需的复杂材料特性的致命挑战。另一方面，设计用于低频应用的隐形斗篷装置将是有利的，并且在技术上也很有帮助，因为在低频下电磁组件更容易解耦。在这项工作中，我们极大地发展了双层方法，以创建一种能够在静态和动态场中工作的三维磁隐形斗篷。在准静态近似下，我们展示了一种完美的磁隐形斗篷装置，其具有从0到250kHz的大频带。我们的装置的实用潜力通过使用商用金属探测器进行了实验验证，这可能会引导我们实现一种真正的隐形应用，其中动态磁场可以以期望的方式被操纵。
