Tailored elastic surface to body wave Umklapp conversion

Gregory J. Chaplain (), Jacopo M. Ponti, Andrea Colombi, Rafael Fuentes-Dominguez, Paul Dryburg, Don Pieris, Richard J. Smith, Adam Clare, Matt Clark and Richard V. Craster
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Gregory J. Chaplain: Imperial College London
Jacopo M. Ponti: Politecnico di Milano
Andrea Colombi: ETH
Rafael Fuentes-Dominguez: University of Nottingham
Paul Dryburg: University of Nottingham
Don Pieris: University of Nottingham
Richard J. Smith: University of Nottingham
Adam Clare: University of Nottingham
Matt Clark: University of Nottingham
Richard V. Craster: Imperial College London

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: 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 polarised 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.

Date: 2020
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DOI: 10.1038/s41467-020-17021-x

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