Acoustofluidic technologies utilize acoustic waves to manipulate fluids and particles within
fluids, all in a contact-free and biocompatible manner. Over the past decade, acoustofluidic …

We use acoustic resonances in a planar layer of half-wavelength thickness to twist wave
vectors of an in-coming plane wave into a spiral phase dislocation of an outgoing vortex …

An acoustic vortex in an inviscid fluid and its radiation torque on an axisymmetric absorbing
object are analyzed beyond the paraxial approximation to clarify an analogy with an optical …

We report on the first quantitative test of acoustic orbital angular momentum transfer to a
sound absorbing object immersed in a viscous liquid. This is done by realizing an original …

Acoustic tweezers use ultrasound for contact-free manipulation of particles from millimeter to
sub-micrometer scale. Particle trapping is usually associated with either radiation forces or …

Based on the Huygens-Fresnel principle, a metasurface structure is designed to generate a
sound vortex beam in airborne environment. The metasurface is constructed by a thin planar …

We examine acoustic radiation force and torque on a small (subwavelength) absorbing
isotropic particle immersed in a monochromatic (but generally inhomogeneous) sound-wave …

We present a theory for the acoustic force density acting on inhomogeneous fluids in
acoustic fields on time scales that are slow compared to the acoustic oscillation period. The …

In previous studies, acoustical levitation in the far-field was limited to particles. Here, this
paper proposes the “boundary hologram method,” a numerical design technique to generate …

The controlled rotation of solid particles trapped in a liquid by an ultrasonic vortex beam is
observed. Single polystyrene beads, or clusters, can be trapped against gravity while …