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Loss-induced modal selection by a resistive wiremesh.

Svetlana Kuznetsova1, Yves Aurégan1, Vincent Pagneux1

  • 1Laboratoire d'Acoustique de l'Université du Mans (LAUM), UMR 6613, Institut d'Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, Avenue O. Messiaen, 72085 Le Mans Cedex 9, France.

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Resistive wiremeshes can selectively absorb or ignore acoustic cavity modes, acting as filters. This study identifies new localized modes and highlights wiremeshes as versatile lossy metasurfaces for non-Hermitian physics.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Non-Hermitian Physics

Background:

  • Acoustic cavities support various modes.
  • Controlling these modes is crucial for applications.
  • Local losses can influence mode behavior.

Purpose of the Study:

  • To investigate the effect of resistive wiremeshes on acoustic cavity modes.
  • To explore selective mode manipulation and filtering.
  • To identify novel modes and understand wiremesh properties.

Main Methods:

  • 1D and 2D acoustic cavity simulations.
  • Analysis of mode eigenfrequencies and localization.
  • Examination of wiremesh properties like resistance and tilt.

Main Results:

  • Wiremeshes enable selective control over acoustic modes (unaffected to fully absorbed).
  • Wiremesh tilt influences higher-order modes in 2D cavities.
  • A new type of mode localized on the wiremesh with imaginary eigenfrequency was discovered.

Conclusions:

  • Wiremeshes function as ultrabroadband lossy metasurfaces.
  • They offer a simple method to explore passive non-Hermitian acoustic systems.
  • This research provides a new tool for acoustic mode filtering and manipulation.