An omnidirectional electromagnetic absorber made of metamaterials

被引：251

作者：

Cheng, Qiang ^{[1
]}

Cui, Tie Jun ^{[1
]}

Jiang, Wei Xiang ^{[1
]}

Cai, Ben Geng ^{[1
]}

机构：

[1] Southeast Univ, Dept Radio Engn, State Key Lab Millimeter Waves, Nanjing 210096, Peoples R China

来源：

NEW JOURNAL OF PHYSICS | 2010年 / 12卷

基金：

美国国家科学基金会;

关键词：

NEGATIVE REFRACTIVE-INDEX; CLOAK;

D O I：

10.1088/1367-2630/12/6/063006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In a recent theoretical work by Narimanov and Kildishev (2009 Appl. Phys. Lett. 95 041106) an optical omnidirectional light absorber based on metamaterials was proposed, in which theoretical analysis and numerical simulations showed that all optical waves hitting the absorber are trapped and absorbed. Here we report the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency. The proposed device is composed of non-resonant and resonant metamaterial structures, which can trap and absorb electromagnetic waves coming from all directions spirally inwards without any reflections due to the local control of electromagnetic fields. It is shown that the absorption rate can reach 99 per cent in the microwave frequency. The all-directional full absorption property makes the device behave like an 'electromagnetic black body', and the wave trapping and absorbing properties simulate, to some extent, an 'electromagnetic black hole.' We expect that such a device could be used as a thermal emitting source and to harvest electromagnetic waves.

引用

页数：10

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