期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.044301
关键词
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资金
- U.K. Engineering and Physical Science Research Council [EP/N014197/1]
- EPSRC [EP/N014197/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N014197/1] Funding Source: researchfish
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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