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Inflatable acoustic metasurfaces for tunable wave focusinga).

Jihoon Ahn1, Danial Panahandeh-Shahraki1, Gunho Kim1

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Summary
This summary is machine-generated.

Researchers developed inflatable acoustic metasurface (IAM) lenses for tunable acoustic focusing. These lenses offer continuous focal length adjustment and aberration correction, advancing acoustic wave control.

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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Physics

Background:

  • Acoustic metasurfaces offer wave control but typically have fixed geometries.
  • The inability to tune acoustic waves limits their functionality for applications like dynamic focusing.

Purpose of the Study:

  • To introduce and demonstrate inflatable acoustic metasurface (IAM) lenses for tunable acoustic focusing.
  • To enable continuous adjustment of focal length and correct for aberrations.

Main Methods:

  • IAM lenses with embedded diffractive patterns were designed and fabricated.
  • Hydraulic inflation was used to nonplanarly deform the membrane and adjust focal length.
  • Focal characteristics (peak pressure, FWHM, FLHM) were measured at various inflation levels.

Main Results:

  • Continuous focal length adjustment was achieved, ranging from -2.49λ to +3.17λ.
  • IAM lenses demonstrated the ability to correct aberrations at oblique incidence angles.
  • Performance metrics were systematically tracked during inflation for characterization.

Conclusions:

  • IAM lenses provide a novel method for dynamic and tunable acoustic focusing.
  • The technology shows potential for real-time acoustic wave manipulation in various applications.
  • IAMs offer advantages over conventional planar lenses, especially in correcting angular aberrations.