TY - JOUR
T1 - Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles
AU - Marzo, Asier
AU - Caleap, Mihai
AU - Drinkwater, Bruce W.
PY - 2018/1/26
Y1 - 2018/1/26
N2 - 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).
AB - 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).
UR - http://www.scopus.com/inward/record.url?scp=85041004687&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.044301
DO - 10.1103/PhysRevLett.120.044301
M3 - Article (Academic Journal)
C2 - 29437423
AN - SCOPUS:85041004687
SN - 0031-9007
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
IS - 4
M1 - 044301
ER -