Noncontact Dynamic Oscillations of Acoustically Levitated Particles by Parametric Excitation

A. Dolev, S. Davis, I. Bucher

Research output: Contribution to journalArticlepeer-review

Abstract

A method for noncontact particle manipulation is realized here by employing parametric excitation (PE) on levitated particles in acoustic traps. PE enables one to oscillate a particle at one of its natural frequencies in the direction associated with the vibration mode, at a controllable amplitude, while the acoustic traps remain fixed in space. Moreover, the method allows one to select and oscillate a specific particle, while multiple particles are being levitated, by taking advantage of the relatively narrow bandwidth of PE. The underlying principle that allows levitation and PE is based on acoustic radiation forces, which are generated due to nonlinear phenomena in strong ultrasound wave fields. To utilize the method, the levitated particle dynamics within the acoustic trap should be known. Therefore, a lumped parameter model that describes the particle's nonlinear dynamics is derived and its parameters are estimated from measured data. The dynamics of a levitated rigid sphere, when subjected to PE, is studied analytically, numerically, and experimentally. The analytical solution is approximated by the method of multiple scales, and is in a good agreement with the experimental results and numerical simulations. Finally, it is experimentally shown that, if a group of particles is levitated, a specific selected particle can be excited, while the others remain mostly still. It is further shown that the particle's oscillation amplitude can be made so large that it will be ejected from the acoustic trap.

Original languageEnglish
Article number034031
JournalPhysical Review Applied
Volume12
Issue number3
DOIs
StatePublished - 16 Sep 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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