Abstract
We have numerically investigated the propagation of acoustic waves in a periodic array of triangular holes embedded in a matrix composed of viscoelastic materials, such as polymers, using an extended finite-difference time-domain method. Although the viscoelasticity of the substrate in acoustic wave rectifiers smears out the fine structures observed at the transmission rate, the rectifying effect of acoustic waves survives. Moreover, the transmittance for longitudinal wave incidence broadly shows a vivid rectification effect in a wide frequency range when the difference between the velocities of longitudinal and transverse waves is large. In addition, the extreme sensitivity of shear rate with respect to time (or frequency) gives rise to the marked modulation of the frequency dependence of the transmission rate.
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