Acoustic forces near elastic substrate

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 a leaking Rayleigh wave results in a 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 waves from the interface. The reported results propose the method of acoustic manipulation via surface wave excitation and demonstrate the effect of elastic media in acoustical trapping of micro-objects.