Spectral holographic trapping: Creating dynamic force landscapes with polyphonic waves

Area of Science:

• Acoustic manipulation
• Wave physics
• Nanotechnology

Background:

• Acoustic trapping utilizes sound waves to move micro- and nanoscale objects in three dimensions.
• Traditional methods rely on complex transducer arrays to shape sound fields, mimicking optical trapping.
• Existing techniques often require precise control over amplitude and phase at a single carrier frequency.

Purpose of the Study:

• To explore spectral holographic acoustic trapping as a simpler alternative to traditional methods.
• To demonstrate dexterous control of objects using the spectral content of sound fields.
• To investigate novel dynamical systems driven by acoustic wave interactions.

Main Methods:

• Applying theoretical frameworks for monotone acoustic force landscapes to spectrally rich sound fields.
• Utilizing the quasistatic approximation for sound field analysis.
• Projecting acoustic conveyor beams and controlling spectral reflections.

Main Results:

• Demonstrated spectral holographic acoustic trapping for moving millimeter-scale objects along defined paths.
• Successfully controlled acoustic force landscapes using spectral content, not just amplitude and phase.
• Realized two variations of a wave-driven oscillator system with complex dynamics.

Conclusions:

• Spectral holographic acoustic trapping offers a simplified hardware approach to complex acoustic manipulation.
• The spectral content of sound waves provides a powerful and versatile tool for controlling acoustic forces.
• This method opens new avenues for creating and studying complex dynamical systems using acoustic waves.