Tailored elastic surface to body wave Umklapp conversion

Chaplain, Gregory J.; De Ponti, Jacopo M.; Colombi, Andrea; Fuentes-Dominguez, Rafael; Dryburg, Paul; Pieris, Don; Smith, Richard J.; Clare, Adam; Clark, Matt; Craster, Richard V.

Abstract

© 2020, The Author(s). 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.

Citation

Chaplain, G. J., De Ponti, J. M., Colombi, A., Fuentes-Dominguez, R., Dryburg, P., Pieris, D., Smith, R. J., Clare, A., Clark, M., & Craster, R. V. (2020). Tailored elastic surface to body wave Umklapp conversion. Nature Communications, 11(1), Article 3267. https://doi.org/10.1038/s41467-020-17021-x

• Journal Article Type: Article
• Acceptance Date: May 25, 2020
• Online Publication Date: Jun 29, 2020
• Publication Date: 2020-12
• Deposit Date: Dec 18, 2020
• Publicly Available Date: Jan 5, 2021
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Issue: 1
• Article Number: 3267
• DOI: https://doi.org/10.1038/s41467-020-17021-x
• Keywords: General Biochemistry, Genetics and Molecular Biology; General Physics and Astronomy; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/4747230
• Publisher URL: https://www.nature.com/articles/s41467-020-17021-x
• Additional Information: Received: 12 January 2020; Accepted: 25 May 2020; First Online: 29 June 2020; : The authors declare no competing interests.