Synthesis of anisotropic swirling surface acoustic waves by inverse filter, towards integrated generators of acoustical vortices

Abstract

From radio-electronics signal analysis to biological samples actuation, surface acoustic waves (SAW) are involved in a multitude of modern devices. Despite this versatility, SAW transducers developed up to date only authorize the synthesis of the most simple standing or progressive waves such as plane and focused waves. In particular, acoustical integrated sources able to generate acoustical vortices (the analogue of optical vortices) are missing. In this work, we propose a flexible tool based on inverse filter technique and arrays of SAW transducers enabling the synthesis of prescribed complex wave patterns at the surface of anisotropic media. The potential of this setup is illustrated by the synthesis of a 2D analog of 3D acoustical vortices, namely "swirling surface acoustic waves". Similarly to their 3D counterpart, they appear as concentric structures of bright rings with a phase singularity in their center resulting in a central dark spot. Swirling SAW can be useful in fragile sensors whose neighborhood needs vigorous actuation, and may also serve as integrated transducers for acoustical vortices. Since these waves are essential to fine acoustical tweezing, swirling SAW may become the cornerstone of future micrometric devices for contactless manipulation.

References in corpus (7)

• Engineering spin-orbit coupling for photons and polaritons in microstructures
• Fast acoustic tweezers for the two-dimensional manipulation of individual particles in microfluidic channels
• Holographic generation of highly twisted electron beams
• Using electron vortex beams to determine chirality of crystals in transmission electron microscopy
• Directional and dynamic modulation of the optical emission of an individual GaAs nanowire using surface acoustic waves
• Cyclones and attractive streaming generated by acoustical vortices
• Quadrefringence of optical vortices in a uniaxial crystal

Cited by in corpus (11)

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• Acoustic radiation force on small spheres due to transient acoustic fields
• Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics
• Taming the degeneration of Bessel beams at anisotropic-isotropic interface: toward 3D control of confined vortical waves
• 3D trapping and dynamic axial manipulation with frequency-tuned spiraling acoustical tweezers
• Dynamics of sessile and pendant drop excited by surface acoustic waves: gravity effects and correlation between oscillatory and translational motions
• Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
• Effect of viscosity on surface acoustic wave driven collective particle dynamics in sessile droplets: nebula, black holes and white dwarfs
• Contactless generation and trapping of hydrodynamic knots in sessile droplets by acoustic screw dislocations