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Topological-charge multiplexed metasurfaces for generating structural acoustic field and remote dynamic control.

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Researchers developed a topological-charge multiplexed metasurface (TCMM) for generating and controlling structured acoustic waves. This novel approach enables dynamic manipulation of multiple sound vortices, advancing acoustic communications and fluidic applications.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Wave Physics

Background:

  • Structured acoustic fields with phase singularities are crucial for applications like acoustic communications and acoustofluidics.
  • Existing methods for generating structured sound face limitations in multiplexing capacity and dynamic control of sound vortices.

Purpose of the Study:

  • To introduce a novel approach for generating structured acoustic waves with enhanced control.
  • To demonstrate the capability of a topological-charge multiplexed metasurface (TCMM) for dynamic manipulation of acoustic vortices.

Main Methods:

  • Development and application of a topological-charge multiplexed metasurface (TCMM).
  • Encoding topological charges (TCs) onto the metasurface to define acoustic vortex properties.
  • Utilizing the TCMM for independent tuning and remote dynamic control of multiple acoustic vortices.

Main Results:

  • The TCMM efficiently generates structured sound fields with multiple spatial vortex singularities.
  • Acoustic vortex characteristics are precisely determined by the encoded topological charges.
  • Independent tuning of degrees of freedom allows for dynamic remote control over vortex motion.

Conclusions:

  • The proposed TCMM offers a powerful platform for engineering structured acoustic waves.
  • This method provides new insights into the generation and dynamic control of sound vortices.
  • Enables precise control over acoustic vortex motion for advanced applications.