Tunable multifunctional fish-bone elastic metasurface for the wavefront manipulation of the transmitted in-plane waves

摘要

In this work, a tunable fish-bone elastic metasurface is used to manipulate in-plane waves, which are more complex than flexural or out-of-plane waves because of the coupling of P- and SV-waves. First, refracted generalized Snell's law (GSL) for a mixed in-plane wave is deduced, which is also testified by the numerical results. Then, according to the GSL, elastic metasurfaces are designed to realize multifunctions such as directional refraction and wave focusing for different working frequencies. Critical refraction is discussed for the directional refraction, and the behavior of the SV-wave is predicted when the P-wave is designed to focus at any point by the metasurface.