Rainbow and blueshift effect of a dispersive spherical invisibility cloak impinged on by a nonmonochromatic plane wave

被引：31

作者：

Zhang, Baile ^{[1
]}

Wu, Bae-Ian ^{[1
,2
]}

Chen, Hongsheng ^{[1
,2
]}

Kong, Jin Au ^{[1
,2
]}

机构：

[1] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[2] Zhejiang Univ, Electromagnet Acad, Hangzhou 310058, Zhejiang, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.101.063902

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate some interesting phenomena associated with a nonmonochromatic plane wave passing through a spherical invisibility cloak whose radial permittivity and permeability are of Drude and Lorentz types. We observe that the frequency center of a quasimonochromatic incident wave will suffer a blueshift in the forward scattering direction. Different frequency components have different depths of penetration, causing a rainbowlike effect within the cloak. The concept of group velocity at the inner boundary of the cloak needs to be revisited. Extremely low scattering can still be achieved within a narrow band.

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页数：4

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