Acoustic spin transfer to a subwavelength spheroidal particle
arXiv:2003.12784 · doi:10.1103/PhysRevE.101.043102
Abstract
We demonstrate that the acoustic spin of a first-order Bessel beam can be transferred to a subwavelength (prolate) spheroidal particle at the beam axis in a viscous fluid. The induced radiation torque is proportional to the acoustic spin, which scales with the beam energy density. The analysis of the particle rotational dynamics in a Stokes' flow regime reveals that its angular velocity varies linearly with the acoustic spin. Asymptotic expressions of the radiation torque and angular velocity are obtained for a quasispherical and infinitely thin particle. Excellent agreement is found between the theoretical results of radiation torque and finite element simulations. The induced particle spin is predicted and analyzed using the typical parameter values of the acoustical vortex tweezer and levitation devices. We discuss how the beam energy density and fluid viscosity can be assessed by measuring the induced spin of the particle.
arXiv comment08 pages, 3 figures
References in corpus (4)
Cited by in corpus (7)
- Nonlinear interaction of acoustic waves with a spheroidal particle: radiation force and torque effects
- Confined phase singularities reveal the spin-to-orbital angular momentum conversion of sound waves
- An efficient procedure to predict the acoustophoresis of axisymmetric irregular particles above ultrasound transducer array
- Mean-acoustic fields exerted on a subwavelength axisymmetric particle
- Acoustic radiation force and radiation torque beyond particles: Effects of non-spherical shape and Willis coupling
- Acoustic spin and orbital angular momentum using evanescent Bessel beams
- Acoustic radiation force and torque on spheroidal particles in an ideal cylindrical chamber