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Acoustic Poisson-like effect in periodic structures.

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Acoustic energy can be redirected by 90° in sonic crystals using a novel resonance effect. This phenomenon, analogous to the Poisson effect in solids, enables unprecedented control over sound wave propagation.

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Area of Science:

  • Acoustics
  • Materials Science
  • Solid Mechanics

Background:

  • Sonic crystals typically allow sound to pass through due to their acoustic transparency.
  • Controlling acoustic energy redirection in such materials presents a significant challenge.

Purpose of the Study:

  • To demonstrate 90° redirection of acoustic energy in an acoustically transparent sonic crystal.
  • To investigate a novel mechanism for acoustic wave manipulation.

Main Methods:

  • Excitation of an antisymmetric mode by matching Bragg scattering with quadrupole scatterer resonance.
  • Demonstration using the first flexural resonance in cylindrical shells of elastic solids.
  • Simulations of a finite array of impedance and index-matched acrylic shells in water.

Main Results:

  • Achieved significant acoustic energy redirection by 90°.
  • Observed a dynamic effect coupling normal wave motion to perpendicular motion, analogous to the Poisson effect.
  • Simulations confirmed dramatic redirection in an otherwise transparent medium.

Conclusions:

  • Acoustic energy can be effectively redirected using resonant phenomena in sonic crystals.
  • The demonstrated Poisson-like effect offers new possibilities for acoustic wave control and manipulation.
  • This work paves the way for advanced acoustic devices and metamaterials.