亚波长球形粒子的声自旋转移
Acoustic spin transfer to a subwavelength spheroidal particle
摘要：
我们证明了在粘性流体中，一阶贝塞尔光束的声自旋可以转移到位于光束轴上的亚波长（扁长）椭球粒子上。感应辐射扭矩与声自旋成比例，声自旋与射束能量密度成比例。对Stokes流场中粒子旋转动力学的分析表明，粒子的角速度与声自旋成线性关系。本文给出了准球形无限细粒子的辐射力矩和角速度的渐近表达式。辐射力矩的理论计算结果与有限元模拟结果吻合良好。利用声学涡旋镊子和悬浮装置的典型参数值，对诱导粒子自旋进行了预测和分析。我们讨论了如何束能量密度和流体粘度可以通过测量的粒子的诱导自旋进行评估。
英文摘要：
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.
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