Contreras Victor, Volke-Sepúlveda Karen
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca 62210, Mexico.
Instituto Física, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico.
Ultrasonics. 2024 Mar;138:107230. doi: 10.1016/j.ultras.2023.107230. Epub 2024 Jan 2.
Airborne acoustic trapping by ultrasonic phased arrays has seen great advances in recent years, and yet the manipulation of objects with different shapes and sizes or heavy particles remains challenging. Here, we demonstrate that the manipulation capabilities of a standing-wave acoustic levitator can be extended by introducing intracavity high-order transverse (HOT) modes in the azimuthal direction, enabling the simultaneous trapping of several objects within a wide range of shapes and sizes with positional and rotational stability, including objects with sizes larger than one wavelength and weights in the scale of millinewtons. The conditions to generate different HOT modes are theoretically analyzed and experimentally implemented. We numerically calculate the pressure distributions, exhibiting good qualitative agreement with the experimental pressure distributions obtained with schlieren images. In addition, we calculate the acoustic force field for several examples of HOT modes and different particle sizes, which leads to a qualitative understanding of the experimental observations.
近年来，超声相控阵实现的空气声阱取得了巨大进展，然而，对不同形状和尺寸的物体或重粒子的操控仍然具有挑战性。在此，我们证明，通过在方位角方向引入腔内高阶横向（HOT）模式，可以扩展驻波声悬浮器的操控能力，从而能够在位置和旋转稳定性方面同时捕获多种形状和尺寸的物体，包括尺寸大于一个波长且重量达毫牛顿量级的物体。从理论上分析并通过实验实现了产生不同HOT模式的条件。我们通过数值计算得到压力分布，与通过纹影图像获得的实验压力分布具有良好的定性一致性。此外，我们针对几个HOT模式和不同粒径的例子计算了声力场，从而对实验观测结果有了定性的理解。
