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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.