Depiction of a design for a directional 3D acoustic cloak for airborne sound. Surrounding the central cloaked object (a sphere of radius 4 cm) are 60 concentric acoustically rigid tori.
From the article:
Three-Dimensional Axisymmetric Cloak Based on the Cancellation of Acoustic Scattering from a SphereL. Sanchis, V. M. García-Chocano, R. Llopis-Pontiveros, A. Climente, J. Martínez-Pastor, F. Cervera, and J. Sánchez-Dehesa
Phys. Rev. Lett. 110, 124301 (2013)
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