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

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.