Metasurfaces design for tuning of flexural wave and SH wave

In this paper, a square mass oscillator elastic metasurface (SMEM) is used to manipulate flexural wave and SH wave. Due to the symmetry of its oscillator in z and y directions, the functional units of the SMEM have the same phase delay effects in the motion direction of the two waves, so as to realize the modulation of flexural and SH waves. According to Generalized Snell’s Law, abnormal refraction and beam focusing can be achieved by reasonably changing the side length of the cross section. In particular, the proposed metasurface can even realize the abnormal refraction of two waves simultaneously. In addition, the multiple mass oscillator array design (MMAD) can also greatly broaden the operating frequency domain. This study presents a method for achieving multifunctional metasurfaces with potential applications in areas such as vibration control, energy harvesting, and noise isolation.