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Opt Express. 2009 Apr 27;17(9):7068-73.

Rainbow-like radiation from an omni-directional source placed in a uniaxial metamaterial slab.

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1
The Electromagnetics Academy at Zhejiang University, Zhejiang University, Hangzhou 310027, China.

Abstract

In this paper, the radiation of an omni-directional line source placed in a uniaxial metamaterial slab is experimentally presented. The anisotropic slab made of metallic symmetrical rings with dispersive permeability is investigated both theoretically and experimentally. For low value of the permeability, a directive radiation at the broadside of the slab can be obtained. Due to the excitation of the leaky wave mode supported by this structure, the emitted electromagnetic wave transmits at a greater angle from the normal of the slab as the value of permeability increases along with the frequency. Thus a rainbow-like radiation will be formed since waves of different frequencies will deflect into different directions.

PMID:
19399082
[Indexed for MEDLINE]
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