Tailored elastic surface to body wave Umklapp conversion.
- Chaplain GJ Department of Mathematics, Imperial College London, London, SW7 2AZ, UK. gregory.chaplain16@imperial.ac.uk.
- De Ponti JM Department of Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133, Milano, Italy.
- Colombi A Department of Civil, Environmental and Geomatic Engineering, ETH, Stefano-Franscini-Platz 5, 8093, Zürich, Switzerland.
- Fuentes-Dominguez R Optics and Photonics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
- Dryburg P Optics and Photonics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
- Pieris D Optics and Photonics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
- Smith RJ Optics and Photonics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
- Clare A Advanced Component Engineering Laboratory (ACEL), Faculty of Engineering, University of Nottingham, NG7 2RD, Nottingham, UK.
- Clark M Optics and Photonics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
- Craster RV Department of Mathematics, Imperial College London, London, SW7 2AZ, UK.
- 2020-07-01
Published in:
- Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English
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.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1038/s41467-020-17021-x
- PMID 32601307
- Persistent URL
- https://sonar.ch/global/documents/60936
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