Programmable Acoustic Holography using Medium-Sound-Speed Modulation.

Area of Science:

• Acoustics
• Optics
• Microfluidics

Background:

• Acoustic holography enables microscale object manipulation through designed acoustic fields.
• Current 3D printed holographic phase plates are static or have large apertures, limiting rapid field alteration.

Purpose of the Study:

• To demonstrate a programmable acoustic holography approach for creating reconfigurable acoustic fields.
• To utilize sound speed modulation for generating diverse acoustic patterns.

Main Methods:

• Encoding multiple images onto a holographic phase plate.
• Modifying the sound speed of an intervening fluid medium to produce desired acoustic fields.
• Demonstrating pattern generation including lines, letters, and numbers.

Main Results:

• Successful generation of programmable acoustic fields.
• Creation of various acoustic patterns like continuous line segments and discrete characters.
• Validation of the method as a sound speed indicator and fluid identification tool.

Conclusions:

• The programmable acoustic holography approach allows for reconfigurable and designed acoustic fields.
• This technique offers broad potential in microfluidics, cell/tissue engineering, real-time sensing, and medical ultrasound.