Particle assembly with synchronized acoustical tweezers

Abstract

The contactless selective manipulation of individual objects at the microscale is powerfully enabled by acoustical tweezers based on acoustical vortices [Baudoin et al., Sci. Adv., 5:eaav1967 (2019)]. Nevertheless, the ability to assemble multiple objects with these tweezers has not yet been demonstrated yet and is critical for many applications, such as tissue engineering or microrobotics. To achieve this goal, it is necessary to overcome a major difficulty: the ring of high intensity ensuring particles trapping at the core of the vortex beam is repulsive for particles located outside the trap. This prevents the assembly of multiple objects. In this paper, we show (in the Rayleigh limit and in 2D) that this problem can be overcome by trapping the target objects at the core of two synchronized vortices. Indeed, in this case, the destructive interference between neighboring vortices enables to create an attractive path between the captured objects. The present work may pioneer particles precise assembly and patterning with multi-tweezers.

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Cited by in corpus (6)

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• Acoustic Hologram Optimisation Using Automatic Differentiation
• Equivalence between angular spectrum-based and multipole expansion-based formulas of the acoustic radiation force and torque
• Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
• Theory of acoustic trapping of microparticles in capillary tubes
• Underwater Acoustic Multiplexing Communication by Pentamode Metasurface