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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2015 ; 5 (ä): ä Nephropedia Template TP
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Molding acoustic, electromagnetic and water waves with a single cloak #MMPMID26057934
Xu J; Jiang X; Fang N; Georget E; Abdeddaim R; Geffrin JM; Farhat M; Sabouroux P; Enoch S; Guenneau S
Sci Rep 2015[]; 5 (ä): ä PMID26057934show ga
We describe two experiments demonstrating that a cylindrical cloak formerly introduced for linear surface liquid waves works equally well for sound and electromagnetic waves. This structured cloak behaves like an acoustic cloak with an effective anisotropic density and an electromagnetic cloak with an effective anisotropic permittivity, respectively. Measured forward scattering for pressure and magnetic fields are in good agreement and provide first evidence of broadband cloaking. Microwave experiments and 3D electromagnetic wave simulations further confirm reduced forward and backscattering when a rectangular metallic obstacle is surrounded by the structured cloak for cloaking frequencies between 2.6 and 7.0?GHz. This suggests, as supported by 2D finite element simulations, sound waves are cloaked between 3 and 8?KHz and linear surface liquid waves between 5 and 16?Hz. Moreover, microwave experiments show the field is reduced by 10 to 30?dB inside the invisibility region, which suggests the multi-wave cloak could be used as a protection against water, sonic or microwaves.