Acoustic vortices provide a single-beam approach to manipulate objects with sizes from
nanometers to millimeters, gaining increasing interest in recent years. The helical beam …

Acoustic vortices can transfer angular momentum and trap particles. Here, we show that
particles trapped in airborne acoustic vortices orbit at high speeds, leading to dynamic …

Recently, metasurfaces have been proven to be effective and compact devices for the
design of arbitrary wavefronts. Metasurfaces are planar metamaterials with a subwavelength …

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 observe distinct regimes of orbital angular momentum (OAM) transfer from two-
dimensional Bessel-shaped acoustic vortices to matter. In a homogeneous diphasic mixture …

This work aims to model the acoustic radiation forces acting on an elastic sphere placed in
an inviscid fluid. An expression of the axial and transverse forces exerted on the sphere is …

Vortex beams with a twisted wavefront possess both intrinsic and extrinsic orbital angular
momenta. Their coupling (viz. orbital-orbital coupling) leads to an orbital angular momentum …

The interactions of two Bessel acoustic vortices (BAVs) with different topological charges
(TCs) have been investigated in detail. The theoretical results show that, with changing the …

Orbital angular momentum (OAM) carried by acoustic vortex attracts extensive research
interests due to the possible application such as acoustic tweezer and communications. The …

An imaging technique is here proposed to overcome the classical “diffraction limit” by using
helical beams. This technique and the analysis presented are valid for all kinds of waves …