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Area of Science:

  • Acoustics
  • Wave physics
  • Optics (by analogy)

Background:

  • Waves carry linear and angular momentum.
  • Transverse waves (light) have spin and orbital angular momentum (OAM).
  • Longitudinal waves (sound) lack spin but can carry OAM with specific phase structuring.

Purpose of the Study:

  • To demonstrate the transfer of OAM from sound to macroscopic objects.
  • To study wave-matter energy exchange.
  • To build a compact, free-space acoustic spanner.

Main Methods:

  • Utilizing a 3D-printed sound-guiding structure.
  • Employing common electronic components.
  • Characterizing sound fields via phase and amplitude mapping.

Main Results:

  • A functional free-space acoustic spanner was constructed.
  • Macroscopic objects were observed to spin via acoustic OAM.
  • Rotation direction was controlled by the OAM field's handedness.

Conclusions:

  • Acoustic OAM can be transferred to macroscopic objects.
  • The developed acoustic spanner provides a tool for studying wave-matter interactions.
  • This technology offers a novel method for manipulating objects with sound.