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 …

The ability to manipulate therapeutic agents in fluids is of interest to improve the efficiency of
targeted drug delivery. Ultrasonic manipulation has great potential in the field of therapeutic …

Acoustic levitation uses focused high-intensity airborne ultrasound to hold particles in mid-
air. It is becoming an important tool for experiments in spectrometry, lab-on-a-droplet, and …

Although the traditional focused acoustic-vortex (FAV) beams can be realized by a spherical
acoustic lens, the manipulation performance still suffers from the incomplete focusing at a …

We report a laser-based method to generate high central-frequency focused ultrasound
vortices by introducing the Fresnel spiral for optoacoustic conversion. The formed …

The development of contactless acoustic-levitation technology has grown rapidly in recent
years, and the acoustic-levitation system is an electromechanical system with complex …

Acoustic vortex states with spiral phase dislocation that can carry orbital angular momentum
(OAM) have aroused much research interest in recent years. The mainstream methods of …

A method for controlling particles based on levitation in a wideband ultrasonic field is
presented in this work. Phased arrays of ultrasonic emitters were used as ultrasonic sources …

Acoustically levitated droplets in the nanoliter to microliter range are studied in various
fields. The volume measurements of these are conventionally done using image analysis. A …

Acoustic-vortex (AV) tweezers ensure stable particle trapping at a zero-pressure center,
while particle assembly between two vortex cores is still prevented by the high-potential …