School of Information Science and Engineering, Lanzhou University, People's Republic of China.
Phys Rev Lett. 2012 Aug 3;109(5):053902. doi: 10.1103/PhysRevLett.109.053902. Epub 2012 Aug 2.
We present the first experimental demonstration of a dc electric cloak for steady current fields. Using the analogy between electrically conducting materials and resistor networks, a dc invisibility cloak is designed, fabricated, and tested using the circuit theory. We show that the dc cloak can guide electric currents around the cloaked region smoothly and keep perturbations only inside the cloak. Outside the cloak, the current lines return to their original directions as if nothing happens. The measurement data agree exceptionally well with the theoretical prediction and simulation result, with nearly perfect cloaking performance. The proposed method can be directly used to realize other dc electric devices with anisotropic conductivities designed by the transformation optics. Manipulation of steady currents with the control of anisotropic conductivities has a lot of potential applications, such as electric impedance tomography, graphene, natural resource exploration, and military camouflage.
我们首次展示了直流电场的电隐身斗篷的实验演示。利用导电材料与电阻网络之间的类比，我们使用电路理论设计、制造并测试了直流隐身斗篷。我们表明，直流隐身斗篷可以引导电流在隐身区域周围平滑流动，并将扰动仅保持在隐身斗篷内部。在隐身斗篷外部，电流线恢复到原来的方向，就像什么都没有发生一样。测量数据与理论预测和模拟结果非常吻合，具有近乎完美的隐身性能。所提出的方法可以直接用于实现其他具有各向异性电导率的直流电隐身器件，这些器件是通过变换光学设计的。通过控制各向异性电导率来操纵稳定电流具有许多潜在的应用，如电阻抗断层成像、石墨烯、自然资源勘探和军事伪装。
