Transfer of Angular Momentum to Matter from Acoustical Vortices in Free Space
- 16 January 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 100 (2), 024302
- https://doi.org/10.1103/physrevlett.100.024302
Abstract
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 and 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.
Keywords
This publication has 14 references indexed in Scilit:
- Synthesis and analysis of linear and nonlinear acoustical vorticesPhysical Review E, 2005
- Optoacoustic generation of a helicoidal ultrasonic beamThe Journal of the Acoustical Society of America, 2004
- Pseudo Angular Momentum and Topological Charge Conservation for Nonlinear Acoustical VorticesPhysical Review Letters, 2003
- Observation of the Transfer of the Local Angular Momentum Density of a Multiringed Light Beam to an Optically Trapped ParticlePhysical Review Letters, 2003
- An acoustical helicoidal wave transducer with applications for the alignment of ultrasonic and underwater systemsThe Journal of the Acoustical Society of America, 1999
- Mechanical equivalence of spin and orbital angular momentum of light: an optical spannerOptics Letters, 1997
- Direct Observation of Transfer of Angular Momentum to Absorptive Particles from a Laser Beam with a Phase SingularityPhysical Review Letters, 1995
- Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modesPhysical Review A, 1992
- First-Order Torques and Solid-Body Spinning Velocities in Intense Sound FieldsPhysical Review Letters, 1977
- Dislocations in wave trainsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1974