Acoustic Subwavelength Manipulation of Particles with a Quasiperiodic Plate

Abstract

Acoustic manipulation has been a topic of significant research in recent years. However, the trapping scale in the radiative acoustic field domain is severely limited by the diffraction limit of the classic wave. Here, we report on a simple strategy to create multiple acoustic diffraction-limit-broken spots at different spatial positions in the far-field region for a wide frequency range. The subwavelength acoustic field comes from the interference of the plentiful diffractive beams specific to a quasiperiodic structure plate. We analyze the acoustic radiation force of the gradient field at multiheight plane above the plate for different frequencies and further demonstrate acoustic pushing and ring-shaped trapping of polystyrene particles within this subwavelength region. This work could be envisaged to pave a way for high-resolution manipulation of tiny particles in biomedical and cell research fields.