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Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

Research output: Contribution to journalArticle

Original languageEnglish
Article number044301
Number of pages6
JournalPhysical Review Letters
Volume120
Issue number4
Early online date22 Jan 2018
DOIs
DateAccepted/In press - 11 Dec 2017
DateE-pub ahead of print - 22 Jan 2018
DatePublished (current) - 26 Jan 2018

Abstract

Acoustic vortices can transfer angular momentum and trap particles. Here, we show that particles trapped in airborne acoustic vortices orbit at high speeds, leading to dynamic instability and ejection. We demonstrate stable trapping inside acoustic vortices by generating sequences of short-pulsed vortices of equal helicity but opposite chirality. This produces a "virtual vortex" with an orbital angular momentum that can be tuned independently of the trapping force. We use this method to adjust the rotational speed of particles inside a vortex beam and, for the first time, create three-dimensional acoustics traps for particles of wavelength order (i.e., Mie particles).

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via APS at https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.044301 . Please refer to any applicable terms of use of the publisher.

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