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Area of Science:

  • Acoustic and Optical Physics
  • Nanotechnology
  • Optomechanics

Background:

  • Control over wave symmetry is crucial for optical and mechanical applications.
  • Orbital angular momentum (OAM) offers a powerful tool for wave manipulation.
  • Existing methods for generating OAM in acoustic waves are limited.

Purpose of the Study:

  • To introduce a novel device for generating acoustic vortices.
  • To demonstrate the device's capability to impart OAM modulation on light.
  • To explore applications in light communication and particle manipulation.

Main Methods:

  • Device fabrication through shape-engineering of a single-contact bulk acoustic wave resonator.
  • Generation of acoustic vortices across a wide frequency band (around 4 GHz).
  • Tunable topological charge of acoustic vortices (1 to beyond 13) via geometry and excitation frequency.

Main Results:

  • Successful generation of acoustic vortices with tunable topological charges.
  • Demonstration of OAM modulation on reflected light beams at super-high frequencies.
  • Achieved wideband operation around 4 GHz.

Conclusions:

  • The developed device provides an on-chip, all-electrical solution for acoustic vortex generation.
  • Offers compact and tunable OAM modulation for light beams.
  • Enables new possibilities for angular-momentum-based light communication, 3D particle manipulation, and optomechanical devices.