Transfer of angular momentum to matter from acoustical vortices in free space

An experimental demonstration of the mechanical transfer of orbital angular momentum to matter from acoustical vortices in free field is presented. Vortices with topological charges l=+/-1 and l=+/-2 were generated and a torsion pendulum was used to study the angular momentum transfer to hanging dis...

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Bibliographic Details
Published in:Physical review letters 2008-01, Vol.100 (2), p.024302-024302, Article 024302
Main Authors: Volke-Sepúlveda, Karen, Santillán, Arturo O, Boullosa, Ricardo R
Format: Article
Language:English
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Summary:An experimental demonstration of the mechanical transfer of orbital angular momentum to matter from acoustical vortices in free field is presented. Vortices with topological charges l=+/-1 and l=+/-2 were generated and a torsion pendulum was used to study the angular momentum transfer to hanging disks of several sizes. This allowed us to make a comparative study of the effective acoustical torque in terms of topological charge of the vortex, the disk radius, and its position along the main propagation axis. A theoretical discussion of the generated sound fields is also provided.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.100.024302