Molding acoustic, electromagnetic and water waves with a single cloak
Geffrin, Jean Michel
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Online Publication Date2015-06-09
Print Publication Date2015-09
Permanent link to this recordhttp://hdl.handle.net/10754/564186
MetadataShow full item record
AbstractWe 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. © 2015, Nature Publishing Group. All rights reserved.
PublisherSpringer Science and Business Media LLC
Except where otherwise noted, this item's license is described as This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material.
- Broadband cylindrical acoustic cloak for linear surface waves in a fluid.
- Authors: Farhat M, Enoch S, Guenneau S, Movchan AB
- Issue date: 2008 Sep 26
- Making waves round a structured cloak: lattices, negative refraction and fringes.
- Authors: Colquitt DJ, Jones IS, Movchan NV, Movchan AB, Brun M, McPhedran RC
- Issue date: 2013 Sep 8
- Achieving invisibility over a finite range of frequencies.
- Authors: Farhat M, Guenneau S, Movchan AB, Enoch S
- Issue date: 2008 Apr 14
- Broadband acoustic cloak for ultrasound waves.
- Authors: Zhang S, Xia C, Fang N
- Issue date: 2011 Jan 14
- Full-wave finite-difference time-domain simulation of electromagnetic cloaking structures.
- Authors: Zhao Y, Argyropoulos C, Hao Y
- Issue date: 2008 Apr 28