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Tailored elastic surface to body wave Umklapp conversion.
Gregory J Chaplain1, Jacopo M De Ponti2,3, Andrea Colombi4
1Department of Mathematics, Imperial College London, London, SW7 2AZ, UK. gregory.chaplain16@imperial.ac.uk.
Nature Communications
|July 1, 2020
Summary
This study introduces elastic metasurfaces to control surface Rayleigh waves, enabling tunable conversion into bulk waves for advanced applications like energy harvesting and vibration mitigation.
Area of Science:
- Solid mechanics
- Acoustics
- Materials science
Background:
- Surface acoustic waves are crucial in geophysics and device applications.
- Precisely controlling Rayleigh waves and their coupling with body waves is challenging but key for energy harvesting and vibration mitigation.
Purpose of the Study:
- To design elastic metasurfaces for manipulating surface Rayleigh waves.
- To achieve tunable mode conversion of surface waves into bulk waves.
Main Methods:
- Designing elastic metasurfaces with graded rod resonators on an elastic substrate.
- Leveraging Umklapp scattering principles for momentum transfer.
- Employing experiments, theory, and simulations for verification.
Main Results:
- Successfully mode-converted Rayleigh surface waves into tunable bulk shear and compressional waves.
- Demonstrated independent coupling to reversed bulk waves.
- Created passive self-phased arrays for tunable wave redirection and focusing.
Conclusions:
- Tailored Umklapp mechanisms are vital for coupling surface Rayleigh waves to bulk waves.
- The developed elastic metasurfaces offer flexible wave transport for practical applications.
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