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Acoustic cloaks that make object undetectable to sound waves have potentialapplications in a variety of scenarios and have received increasing interestsrecently. However, the experimental realization of a three-dimensional (3D)acoustic cloak that works within broad ranges of operating frequency andincident angle still remains a challenge despite the paramount importance forthe practical application of cloaking devices. Here we report the design andexperimental demonstration of the first 3D broadband cloak capable ofcancelling the scattering field near curved surfaces. Unlike the ground cloaksthat only work in the presence of a flat boundary, the proposed scheme canrender the invisibility effect for an arbitrarily curved boundary. The designedcloak simply comprises homogeneous positive-index anisotropic materials, withparameters completely independent of either the cloaked object or the boundary.With the flexibility of applying to arbitrary boundaries and the potential ofbeing extended to yield 3D acoustic illusion effects, our method may take majora step toward the application of acoustic cloaks in reality and open the avenueto build other acoustic devices with versatile functionalities.

Broadband omnidirectional invisibility for sound in three dimensions