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Tailored elastic surface to body wave Umklapp conversion

Author

Listed:
  • Gregory J. Chaplain

    (Imperial College London)

  • Jacopo M. Ponti

    (Politecnico di Milano
    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
    Imperial College London
    Imperial College London)

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.

Suggested Citation

  • Gregory J. Chaplain & Jacopo M. Ponti & Andrea Colombi & Rafael Fuentes-Dominguez & Paul Dryburg & Don Pieris & Richard J. Smith & Adam Clare & Matt Clark & Richard V. Craster, 2020. "Tailored elastic surface to body wave Umklapp conversion," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17021-x
    DOI: 10.1038/s41467-020-17021-x
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