Phase shift approach for engineering desired radiation force: Acoustic pulling force example

Area of Science:

• Acoustics
• Physics
• Materials Science

Background:

• Acoustic radiation forces are crucial for manipulating microparticles.
• Current methods for engineering these forces can be complex.
• Phase shifts offer a novel approach to simplify analysis and design.

Purpose of the Study:

• To introduce a phase shift method for analyzing and engineering acoustic radiation forces.
• To demonstrate a simplified procedure for designing acoustic radiation forces.
• To showcase the application of phase shifts in creating acoustic tweezers.

Main Methods:

• Utilizing phase shifts from scattering to simplify analytical expressions for acoustic radiation forces.
• Engineering object and beam parameters to achieve desired phase shifts.
• Applying the phase shift approach to a spherical shell to generate forces against a Bessel beam's propagation.

Main Results:

• Analytical results for acoustic radiation forces are simplified into compact, physically meaningful expressions.
• A specific set of phase shifts can fulfill desired radiation forces.
• The phase shift method successfully engineered a spherical shell to generate forces against a Bessel beam, demonstrating in-phase scattering of multiple orders.

Conclusions:

• The phase shift method provides a simplified and effective route for designing acoustic radiation forces.
• This approach is applicable to both traveling beams and standing waves for acoustic tweezers.
• The method offers significant advantages for the precise engineering of acoustic manipulation tools.