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Scaling acoustic vortex traps with topological charge.

Alexandru Crivoi1, Junfei Tai1, Xuanrong Ji2

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Acoustic vortices can trap particles, with size and position controlled by topological charge. This study confirms a linear relationship between trap size and topological charge, crucial for acoustic manipulation technologies.

Keywords:
Acoustic levitationAcoustic vortex trappingTopological charge

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Area of Science:

  • Acoustic manipulation
  • Particle trapping
  • Vortex beams

Background:

  • Three-dimensional acoustic vortex trapping of Mie particles is established.
  • Previous research explored vortex beam properties but lacked detailed analysis of topological charge effects on trapping.

Purpose of the Study:

  • To analytically, numerically, and experimentally investigate how a focused vortex's topological charge influences particle trap size, stability, and position.
  • To establish design principles for acoustic trapping applications.

Main Methods:

  • Utilized a plane wave transducer with a phase-modifying metalens to generate focused vortex beams.
  • Performed analytical, numerical, and experimental analyses.
  • Experimentally validated findings using a piezoelectric transducer and silicone lens to trap polymer particles.

Main Results:

  • Demonstrated a strong linear dependence of trap size on the topological charge.
  • Confirmed that increasing topological charge shifts the trap position closer to the acoustic source.
  • Experimentally trapped polymer particles of various sizes.

Conclusions:

  • Topological charge is a key parameter for controlling acoustic trap dimensions and position.
  • Findings provide essential design principles for biomedical and particle manipulation technologies using acoustic trapping.