Full-wave simulations of electromagnetic cloaking structures
Full-wave simulations of electromagnetic cloaking structures
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DOI：
10.1103/physreve.74.036621
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发表时间：
2006-09-01
影响因子：
2.4
通讯作者：
Pendry, John
中科院分区：
文献类型：
--
作者：
Cummer, Steven A.;Popa, Bogdan-Ioan;Pendry, John
Pendry已经报道了电磁各向异性和非均匀壳，理论上，它可以完全屏蔽任意大小的内部结构免受电磁场的影响，而不会干扰外部场。无论是基于坐标变换的分析公式，也没有支持射线追踪模拟表明如何材料扰动和全波效应可能会影响解决方案。我们报告完全电磁模拟的圆柱形版本的这种隐身结构，使用理想和非理想的（但物理上可实现的）电磁参数，表明低反射和功率流弯曲特性的电磁隐身结构是不是特别敏感，适度的介电常数和磁导率的变化。隐身性能随着损耗的增加而平滑地降低，并且可以利用由理想连续介质的八层（均匀）近似组成的圆柱形壳体来实现有效的低反射屏蔽。一个不完美的，但更简单的版本的隐身材料的推导和重现的方式，可能更容易实验实现的理想材料的射线弯曲。
Pendry have reported electromagnetically anisotropic and inhomogeneous shells that, in theory, completely shield an interior structure of arbitrary size from electromagnetic fields without perturbing the external fields. Neither the coordinate transformation-based analytical formulation nor the supporting ray-tracing simulation indicate how material perturbations and full-wave effects might affect the solution. We report fully electromagnetic simulations of the cylindrical version of this cloaking structure using ideal and nonideal (but physically realizable) electromagnetic parameters that show that the low-reflection and power-flow bending properties of the electromagnetic cloaking structure are not especially sensitive to modest permittivity and permeability variations. The cloaking performance degrades smoothly with increasing loss, and effective low-reflection shielding can be achieved with a cylindrical shell composed of an eight- (homogeneous) layer approximation of the ideal continuous medium. An imperfect but simpler version of the cloaking material is derived and is shown to reproduce the ray bending of the ideal material in a manner that may be easier to experimentally realize.