Zhao Yan, Argyropoulos Christos, Hao Yang
Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom.
Opt Express. 2008 Apr 28;16(9):6717-30. doi: 10.1364/oe.16.006717.
This paper proposes a radial dependent dispersive finite-difference time-domain method for the modeling of electromagnetic cloaking structures. The permittivity and permeability of the cloak are mapped to the Drude dispersion model and taken into account in dispersive FDTD simulations. Numerical simulations demonstrate that under ideal conditions, objects placed inside the cloak are 'invisible' to external electromagnetic fields. However for the simplified cloak based on linear transformations, the back scattering has a similar level to the case of a PEC cylinder without any cloak, rendering the object still being 'visible'. It is also demonstrated numerically that the simplified cloak based on high-order transformations can indeed improve the cloaking performance.
本文提出了一种用于电磁隐身结构建模的径向相关色散时域有限差分方法。隐身衣的介电常数和磁导率被映射到德鲁德色散模型，并在色散时域有限差分模拟中加以考虑。数值模拟表明，在理想条件下，置于隐身衣内部的物体对外部电磁场是“不可见”的。然而，对于基于线性变换的简化隐身衣，其反向散射与没有任何隐身衣的理想导体圆柱体的情况具有相似的水平，这使得物体仍然“可见”。数值模拟还表明，基于高阶变换的简化隐身衣确实可以提高隐身性能。
