Study on acoustic radiation force of an elastic sphere in an off-axial Gaussian beam using localized approximation
Study on acoustic radiation force of an elastic sphere in an off-axial Gaussian beam using localized approximation
复制标题
离轴高斯梁中弹性球体声辐射力的局部近似研究
DOI：
10.1121/10.0010240
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Xiaofeng Zhang
中科院分区：
文献类型：
--
作者：
Shuyuan Li;Jingyao Shi;Xiaofeng Zhang
本文利用球面波函数的局域近似和平移加法定理，得到了离轴高斯光束的展开系数。推导了离轴高斯波束中球体的三维声辐射力。计算了刚性球的轴向声辐射力，验证了推导的公式。为探索高斯光束对粒子声操纵的变化规律，研究了聚苯乙烯球在离轴高斯光束中的位置对横向和轴向声辐射力的影响。计算结果表明，轴向力使聚苯乙烯颗粒远离梁的中心。而对于横向力，在某些位置存在负的声辐射力，这与聚苯乙烯球在高斯光束中的位置有关，负的横向力通常将聚苯乙烯颗粒拉向光束轴。最后，通过有限元数值模拟验证了理论分析的正确性，并与理论分析结果进行了比较，两者吻合较好。该研究为单光束高斯声镊的研制提供了理论依据。
In this paper, the expansion coefficients of the off-axial Gaussian beam are obtained using the localized approximation and the translational addition theorem for spherical wave function. The three-dimensional acoustic radiation force of a sphere positioned in an off-axial Gaussian beam is derived. The axial acoustic radiation force of a rigid sphere is computed to verify the derived expressions. The effect of the position of a polystyrene sphere in an off-axial Gaussian beam on the transverse and axial acoustic radiation forces is studied to explore the changing law of particle acoustic manipulation using a Gaussian beam. The calculated results show that the axial force repels the polystyrene particle away from the center of the beam. However, for the transverse force, there is a negative acoustic radiation force at some positions, which is related to the position of the polystyrene sphere in the Gaussian beam, and the negative transverse forces usually pull the polystyrene particle toward the beam axis. In addition, the numerical simulations based on the finite element method are presented to validate the analytical theory, and the comparison results are in good agreement with each other. The study may provide a theoretical basis for the development of single-beam acoustic tweezers using a Gaussian beam.