Abstract
Acoustic vortices (AV) are special beams with a screw-type dislocation, a pressure null along their principal axis and the ability to carry angular momentum. Mono-element sources, metamaterials, and phased arrays can be used to generate an AV. Among them, phased arrays are employed in the most of works that report particle manipulation with AV because of their ease to shape beams. However, special care must be taken at the design stage of the array because additional zones of constructive interference may appear, i.e., the so called grating lobes surrounding the main beam. When generating vortex beams using phased arrays, we have experimentally verified that these grating lobes have similar characteristics than the main beam, so we called them grating vortices (GV). However, GV exhibit certain level of distortion in both phase and magnitude. In this work, we present an experimental study of the angular momentum transfer capability of GV of different topological charge. We estimate the mechanical torque induced and the angular momentum transferred to disk-like samples of different size. The vortices are generated using a 30-element array operating at 40 kHz in air. A discussion on the potential of use of GV in the manipulation of particle/objects is given.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
