The control of sound propagation and reflection has always been the goal of engineers involved in the design of acoustic systems. A recent design approach based on coordinate transformations, which is applicable to many physical systems1,2,3,4,5,6,7,8,9,10,11,12,13,14, together with the development of a new class of engineered materials called metamaterials, has opened the road to the unconstrained control of sound. However, the ideal material parameters prescribed by this methodology are complex and challenging to obtain experimentally, even using metamaterial design approaches. Not surprisingly, experimental demonstration of devices obtained using transformation acoustics is difficult, and has been implemented only in two-dimensional configurations10,15. Here, we demonstrate the design and experimental characterization of an almost perfect three-dimensional, broadband, and, most importantly, omnidirectional acoustic device that renders a region of space three wavelengths in diameter invisible to sound.
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This work was supported by Multidisciplinary University Research Initiative grants from the Office of Naval Research (N00014-13-1-0631) and from the Army Research Office (W911NF-09-1-00539).
The authors declare no competing financial interests.
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Zigoneanu, L., Popa, BI. & Cummer, S. Three-dimensional broadband omnidirectional acoustic ground cloak. Nature Mater 13, 352–355 (2014). https://doi.org/10.1038/nmat3901
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