Tailored elastic surface to body wave Umklapp conversion

TL;DR

This paper introduces elastic metasurfaces that utilize tailored Umklapp scattering to convert surface Rayleigh waves into bulk waves, enabling tunable wave redirection and focusing for advanced wave control applications.

Contribution

It presents a novel design of elastic metasurfaces leveraging Umklapp scattering to achieve controlled conversion and manipulation of surface and bulk elastic waves.

Findings

Demonstrated conversion of Rayleigh waves to bulk waves via metasurfaces

Achieved tunable wave redirection and focusing within elastic media

Validated results through experiments, theory, and simulations

Abstract

Elastic waves guided along surfaces dominate applications in geophysics, ultrasonic inspection, mechanical vibration, and surface acoustic wave devices; precise manipulation of surface Rayleigh waves and their coupling with polarized body waves presents a challenge that offers to unlock the flexibility in wave transport required for efficient energy harvesting and vibration mitigation devices. We design elastic metasurfaces, consisting of a graded array of rod resonators attached to an elastic substrate that, together with critical insight from Umklapp scattering in phonon-electron systems, allow us to leverage the transfer of crystal momentum; we mode-convert Rayleigh surface waves into bulk waves that form tunable beams. Experiments, theory and simulation verify that these tailored Umklapp mechanisms play a key role in coupling surface Rayleigh waves to reversed bulk shear and compressional waves independently, thereby creating passive self-phased arrays allowing for tunable redirection and wave focusing within the bulk medium.