Acoustic forces near elastic substrate

TL;DR

This paper investigates how elastic substrates influence acoustic forces on particles, revealing that surface wave excitation significantly alters particle equilibrium positions and binding configurations, advancing acoustic manipulation techniques.

Contribution

It introduces a Green's function approach to analyze acoustic forces near elastic substrates, highlighting the impact of surface waves on particle trapping and binding.

Findings

Leaking Rayleigh waves modify acoustic pressure forces.

Elastic substrates change particle equilibrium positions.

Surface waves affect acoustical binding of particles.

Abstract

In this work, we study the acoustic forces acting on particles due to sound scattering at the interface with an elastic substrate. Utilizing the Green's function formalism, we predict that excitation of leaking Rayleigh wave results in strong modification of the acoustic pressure force acting on a monopole scatterer and changes the equilibrium position of particles above the substrate surface. We also showed that the presence of a substrate changes the configuration of the acoustical binding of two particles due to multiple rescattering of acoustic wave from the interface. The reported results propose the method of acoustic manipulation via surface waves excitation and demonstrate the effect from elastic media in acoustical trapping of microobjects.