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Reprogrammable Phononic Metasurfaces.

Osama R Bilal1,2,3, André Foehr2,3, Chiara Daraio3

  • 1Institute for Theoretical Physics, ETH Zurich, Zurich, 8092, Switzerland.

Advanced Materials (Deerfield Beach, Fla.)
|August 26, 2017
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Summary
This summary is machine-generated.

This study presents a novel phononic metamaterial plate with dynamically tunable unit cells. This innovation allows for significant control over elastic wave propagation, offering broad engineering applications.

Keywords:
adaptive waveguidinganalog and digital materialsphononic metamaterialsprogrammable materialsreal-time tunability

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Phononic metamaterials control elastic waves using resonances within structured media.
  • Metamaterial response is dictated by the geometry of their fundamental building blocks.
  • Dynamically tunable unit cells present a significant challenge in metamaterial design.

Purpose of the Study:

  • To realize a metamaterial plate with dynamically tunable unit cells.
  • To harness geometric and magnetic nonlinearities for tuning.
  • To achieve significant control over the amplitude of transmitted elastic waves.

Main Methods:

  • Fabrication of a metamaterial plate with unit cells designed for dynamic tuning.
  • Utilizing geometric and magnetic nonlinearities within the unit cells.
  • Experimental characterization of the plate's response to elastic wave excitation.

Main Results:

  • Demonstrated a metamaterial plate with dynamically tunable unit cells.
  • Achieved stiffness variability in individual unit cells.
  • Controlled transmitted excitation amplitude over three orders of magnitude.

Conclusions:

  • The developed tuning mechanism enables dynamic control of phononic metamaterials.
  • The concepts are scalable to different metamaterial sizes.
  • Potential applications include seismic shielding and ultrasonic cloaking.