Designing Switchable Phononic Crystal-Based Acoustic Demultiplexer

Area of Science:

• Acoustics
• Materials Science
• Wave Physics

Background:

• Phononic crystals (PnCs) offer unique wave manipulation capabilities.
• Acoustic demultiplexing is crucial for signal processing and communication.
• Developing tunable and switchable acoustic devices remains a challenge.

Purpose of the Study:

• To present the design of a switchable acoustic demultiplexer.
• To utilize a fluid-fluid phononic crystal (PnC) platform for acoustic demultiplexing.
• To demonstrate temperature-controlled switching of acoustic channels.

Main Methods:

• Designed a T-shaped PnC waveguide with two dissimilar point-defect cavities.
• Fabricated the PnC using water inclusions in a mercury background.
• Employed methyl nonafluorobutyl ether (MNE) and ethyl nonafluorobutyl ether (ENE) in the cavities to create distinct resonant modes.

Main Results:

• The difference in sound velocities between MNE and ENE in the cavities enabled acoustic demultiplexing.
• The distinct temperature dependencies of sound velocities in MNE and ENE allowed for temperature-induced switching of acoustic channels.
• The designed structure successfully demonstrated switchable acoustic demultiplexing functionality.

Conclusions:

• A novel switchable acoustic demultiplexer based on a fluid-fluid PnC has been successfully designed.
• Temperature control provides an effective mechanism for switching acoustic channels in the demultiplexer.
• This platform offers potential for tunable acoustic signal processing and communication systems.