Vortex-wave beams are beams that carry angular momentum. Their specific feature is a ring-
like transverse distribution of wave intensity with zero intensity at the axis. A method for …

The emergence of new ways of applying high-power ultrasound in medicine that are based
on using nonlinear fields and shock-wave operation modes requires a substantial increase …

The effect of phase conjugation for the second harmonic of a focused ultrasonic beam was
investigated experimentally and by numerical simulation. An ultrasonic pulse with the carrier …

Acoustic vortex beams are structured wavefronts that show phase dependence of the type
exp (ilϕ), with ϕ the azimuthal angle and l the topological charge, respectively. At the …

We demonstrate the generation of acoustic vortex beams with the aid of an acoustic spiral
phase plate and an acoustic grating having a fork-like bifurcation of its slits. The acoustic …

As a nondestructive and contactless method of rotational manipulation on objects, acoustic
radiation torque has attracted much attention in recent years. Here, we propose an effective …

We investigate theoretically the properties of the fundamental and second harmonic
components of the Bessel beam with a finite aperture, the Bessel–Gauss beam, whose …

A study is performed of the effect acoustic inhomogeneities of the abdominal wall have on
the focusing of a powerful ultrasonic beam at different positions of a transducer. A focused …

The transmitter aperture dependence of the ultrasonic nonlinear field was investigated by
using Westervelt equation, Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation and …

We propose an innovative method to generate acoustic vortex waves based on a disc
piezoelectric transducer that is coated with multi-arm coiled electrodes. Finite element …