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We propose a tunable acoustic metasurface consisting of identical units. Andunits are rotatable anisotropic three-component resonators, which can inducethe non-degenerate dipolar resonance, causing an evident phase change in lowfrequencies. Compared with the monopole resonance widely used in Helmholtzresonators, the polarization direction of the dipole resonance is a new degreeof freedom for phase manipulation. The proposed metasurface is constructed byidentical units that made with real (not rigid) materials. And the phaseprofile can continuously change by rotating the anisotropic resonators. Wepresent a wide-angle and broad-band acoustic focusing by the metasurface undera water background.

Continuously Tunable Acoustic Metasurface with Rotatable Anisotropic Three-component Resonators