Author(s): Weiwei Kan, Victor M. Garc'ia-Chocano, F. Cervera, Bin Liang, Xin-ye Zou, Lei-lei Yin, Jianchun Cheng, and Jos'e S'anchez-Dehesa

Concepts from optics aimed at creating “invisibility cloaks” are being extended to acoustics for soundproofing and stealth technology, with the same goal of passing waves around an object with no perceptible perturbation. The authors employ transformation acoustics to design and demonstrate a broadband, three-dimensional cloak that renders an object in an open cavity with hard boundaries nearly undetectable. Their actual cloak is an acoustic metamaterial made simply of stacked sheets of common acrylic plastic, with millimeter-scale features.

[Phys. Rev. Applied 3, 064019] Published Fri Jun 26, 2015

http://link.aps.org/doi/10.1103/PhysRevApplied.3.064019