Twisted Acoustics: Metasurface-Enabled Multiplexing and Demultiplexing.

Area of Science:

• Acoustics
• Metamaterials
• Information Theory

Background:

• Acoustic communication bandwidth is limited by traditional multiplexing schemes.
• Metasurfaces offer novel ways to manipulate sound waves.

Purpose of the Study:

• To demonstrate real-time acoustic communication using metasurfaces and acoustic orbital angular momentum (a-OAM).
• To improve the bandwidth and capacity of acoustic communication systems.

Main Methods:

• Utilizing metasurfaces to encode information onto twisted acoustic beams (a-OAM).
• Numerical simulations and experimental validation of the metasurface-based communication system.
• Demonstrating real-time picture transfer using a-OAM states.

Main Results:

• Successful real-time information transfer via metasurface-controlled a-OAM beams.
• Achieved postprocess-free and sensor-scanning-free acoustic communication.
• Demonstrated compatibility and expandability with other multiplexing techniques.

Conclusions:

• Metasurface-based a-OAM communication offers a new paradigm for high-capacity acoustic systems.
• The technology provides advantages like real-time transmission, low loss, and high accuracy.
• This approach has significant potential to advance acoustic communication and related fields.