Negative acoustic radiation force induced on an elastic sphere by laser irradiation

作者:Yu, Hai-Qun; Yao, Jie; Wu, Da-Jian*; Wu, Xue-Wei; Liu, Xiao-Jun
来源:Physical Review E, 2018, 98(5): 053105.
DOI:10.1103/PhysRevE.98.053105

摘要

We propose an alternative strategy to modulate the acoustic radiation force (ARF) acting on an elastic sphere (ES) using laser irradiation. A mathematical model of the interaction of the acoustic plane wave with the laser-irradiated ES is developed to calculate the ARF acting on the ES. It is demonstrated that the action of this laser-induced photoacoustic effect on a polystyrene (PS) sphere could strongly affect the ARFs of acoustic plane waves that are incident on the PS sphere and negative ARFs could thus be realized. The variational ARF behavior observed is ascribed to competition between the photoacoustic effect and the acoustic scattering. Furthermore, we find that both the laser intensity and the phase difference between the incident laser beam and the acoustic plane wave could be used to modulate the ARF acting on the irradiated PS sphere, with the phase difference playing the dominant role. One effective method for control of the negative ARF involves changing the laser intensity with a suitable phase difference. The work presented here may lead to an alternative way to perform single-beam acoustic manipulation.