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In this work, we propose an elastic metamaterial plate made by an aluminum block tailored with a row of periodic pair of U-shaped slits. Total conversion between longitudinal and transverse modes can be achieved by the metamaterial plate. The conversion is induced by an oblique dipolar resonance, not relying on the Fabry-Pérot resonance or the design of effective parameters. The plate’s thickness can be orders smaller than the working wavelength, showing good potential in practical applications.

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An ultrathin acoustic metasurface consisting of an anisotropic three-component resonator is proposed. The resonator can induce nondegenerate dipole resonances at the same resonant frequencies. A large phase delay can be obtained based on the resonance, which can be modulated by the direction of polarization. The anisotropic resonator can be regarded as an effective homogenous medium with an anisotropic mass density, and the phase change can also be attributed to the change of the effective material parameters. A good comparison between the results for the metasurface and its effective slab is obtained.