Molding acoustic, electromagnetic and water waves with a single cloak
Name
Xu-2015-Molding acoustic.pdf
Size
2.32 MB
Format
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Checksum (MD5)
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Author(s)
Xu, Jun
Jiang, Xu
Georget, Elodie
Abdeddaim, Redha
Geffrin, Jean-Michel
Farhat, Mohamed
Sabouroux, Pierre
Enoch, Stefan
Guenneau, Sébastien
Fang, Nicholas Xuanlai
Date Issued
June 2015
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Xu, Jun, Xu Jiang, Nicholas Fang, Elodie Georget, Redha Abdeddaim, Jean-Michel Geffrin, Mohamed Farhat, Pierre Sabouroux, Stefan Enoch, and Sébastien Guenneau. “Molding Acoustic, Electromagnetic and Water Waves with a Single Cloak.” Scientific Reports 5 (June 9, 2015): 10678.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1038/srep10678
