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

Asier Marzo*, Mihai Caleap, Bruce W. Drinkwater

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

61 Citations (Scopus)
587 Downloads (Pure)

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).

Original languageEnglish
Article number044301
Number of pages6
JournalPhysical Review Letters
Volume120
Issue number4
Early online date22 Jan 2018
DOIs
Publication statusPublished - 26 Jan 2018

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