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Spiral sound-diffusing metasurfaces based on holographic vortices.

Noé Jiménez1, Jean-Philippe Groby2, Vicent Romero-García2

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Metasurfaces with chiral symmetry generate broadband acoustic vortices with unusual scattering properties. These spiral metasurfaces enable diffuse, non-specular sound reflection for diverse wave physics applications.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Wave Physics

Background:

  • Acoustic vortices exhibit unique phase and amplitude properties.
  • Metasurfaces offer precise control over acoustic wave manipulation.
  • Chiral symmetry in metasurfaces can lead to exotic wave phenomena.

Purpose of the Study:

  • To investigate broadband unusual scattering properties of acoustic vortices generated by chiral metasurfaces.
  • To demonstrate the generation of diffuse and non-specular acoustic scattering.
  • To explore applications in wave physics and acoustics.

Main Methods:

  • Design of spiral metasurfaces encoding holographic acoustic vortex fields.
  • Analysis of near-field and far-field scattering characteristics.
  • Experimental validation of scattering coefficients and diffusion properties.

Main Results:

  • Metasurfaces generate broadband acoustic vortices with phase dislocations in the near-field.
  • Specular reflection is inhibited in the far-field due to destructive interference.
  • Uniform, spherical wave divergence from a holographic focal point is achieved.
  • High mean correlation-scattering (0.99) and normalized diffusion (0.73) coefficients were measured over a 4-octave band.

Conclusions:

  • Chiral metasurfaces enable simultaneous broadband, diffuse, and non-specular acoustic scattering.
  • These spiral metasurfaces are promising for controlling acoustic scattering.
  • Potential applications include underwater acoustics, biomedical ultrasound, particle manipulation, and room acoustics.