Broadband steering of the transmitted in-plane waves by using modular mass oscillator elastic metasurface

In this study, the modular mass oscillator elastic metasurface (MMEM) is extended to regulate the in-plane waves. Due to the in-plane waves will be coupled after passing through the metasurface, the regulation of the in-plane waves is more complicated than that of the flexural waves. Based on the generalized Snell's law (GSL), the relationship between the refraction angles of the P-wave and SV-wave can be derived. The numerical results show that both P-wave and SV-wave can achieve a full 2π range of phase shift by changing the sizes of the functional units in MMEM. When the functional units with different sizes are arranged reasonably, the phenomena such as abnormal refraction and beam focusing of one wave can be realized, and the state of the other wave can also be predicted. Furthermore, multi-mass oscillators array design (MMAD) has also been applied, that is, by changing the number of mass oscillators in the x-direction to expand the operating frequency domain of the metasurface, to achieve a wider range of in-plane wave control.