Formation of high-order acoustic Bessel beams by spiral diffraction gratings

Abstract

The formation of high-order Bessel beams by a passive acoustic device consisting of an Archimedes' spiral diffraction grating is theoretically, numerically and experimentally reported in this work. These beams are propagation-invariant solutions of the Helmholtz equation and are characterized by an azimuthal variation of the phase along its annular spectrum producing an acoustic vortex in the near field. In our system, the scattering of plane acoustic waves by the spiral grating leads to the formation of the acoustic vortex with zero pressure on-axis and the angular phase dislocations characterized by the spiral geometry. The order of the generated Bessel beam and, as a consequence, the size of the generated vortex can be fixed by the number of arms in the spiral diffraction grating. The obtained results allow to obtain Bessel beams with controllable vorticity by a passive device, which has potential applications in low-cost acoustic tweezers and acoustic radiation force devices.

References in corpus (4)

• Observation of a single-beam gradient force acoustical trap for elastic particles: acoustical tweezers
• Acoustic Bessel-like beam formation by an axisymmetric grating
• Partial wave series expansions in spherical coordinates for the acoustic field of vortex beams generated from a finite circular aperture
• Acoustics of finite-aperture vortex beams

Cited by in corpus (12)

• Orbital Angular Momentum Waves: Generation, Detection and Emerging Applications
• T-matrix evaluation of three-dimensional acoustic radiation forces on nonspherical objects in Bessel beams with arbitrary order and location
• Perfect Generation of Angular Momentum with Cylindrical Bianisotropic Metasurfaces
• Particle assembly with synchronized acoustical tweezers
• Equivalence between angular spectrum-based and multipole expansion-based formulas of the acoustic radiation force and torque
• Superradiant Amplification of Acoustic Beams via Medium Rotation
• Acoustic radiation torque on a particle in a fluid: an angular spectrum based compact expression
• Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
• Ultra-Long-Range Bessel Beams via Leaky Waves with Mitigated Open Stopband
• Quadrupole Interaction of Non-diffracting Beams with Two-Level Atoms
• Contactless generation and trapping of hydrodynamic knots in sessile droplets by acoustic screw dislocations
• Folding a focalized acoustical vortex on a flat holographic transducer: miniaturized selective acoustical tweezers