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隐形电磁斗篷  

2009-08-29 15:54:02|  分类: 默认分类 |  标签: |举报 |字号 订阅

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这里收集一些电磁斗篷文献。

实验上第一次实现电磁斗篷的文章,发表在Science上,是

Metamaterial Electromagnetic Cloak at Microwave Frequencies

摘要:

A recently published theory has suggested that a cloak of invisibility is in principle possible, at least over a narrow frequency band. We describe here the first practical realization of such a cloak; in our demonstration, a copper cylinder was “hidden” inside a cloak constructed according to the previous theoretical prescription. The cloak was constructed with the use of artificially structured metamaterials, designed for operation over a band of microwave frequencies. The cloak decreased scattering from the hidden object while at the same time reducing its shadow, so that the cloak and object combined began to resemble empty space.

有一篇很好的Review Talk:

Review of Possible Approaches to Electromagnetic Cloaking of Objects

从这个综述我们得知,研究隐形材料可以追溯到70年代。隐形,或不可见,不同于潜行(stealth),后者将反射减弱到最小,如美国的潜行飞机。

80年代,有人研究球对称的分层电介质材料(Sihvola),得到隐形条件。

A. Greenleaf等人将问题翻译成数学语言:导电分布的逆问题,也许是现在隐形电磁斗篷研究最早的理论工作(html版):

Anisotropic conductivities that cannot be detected

摘要:

We construct anisotropic conductivities in dimension three
that give rise to the same voltage and current measurements at the boundary
of a body as a homogeneous isotropic conductivity. These conductivities are
non-zero, but very small close to a surface inside the body

在可见光波段,实验有

Electromagnetic cloaking in the visible frequency range

摘要:

Electromagnetic metamaterials provide unprecedented freedom and flexibility to introduce new devices, which control electromagnetic wave propagation in very unusual ways. Very recently theoretical design of an “invisibility cloak” has been suggested, which has been realized at microwave frequencies in a two-dimensional cylindrical geometry. In this communication we report on the experimental realization of the dielectric permittivity distribution required for non-magnetic cloaking in the visible frequency range.

在以上几篇文章中,可以找到更多的文献。

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