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Sound vortex diffraction via topological charge in phase gradient metagratings.

Yangyang Fu1, Chen Shen2, Xiaohui Zhu2

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Area of Science:

  • Acoustics
  • Metasurfaces
  • Wave physics

Background:

  • Orbital angular momentum (OAM) in wave fields is extensively studied using metasurfaces.
  • Acoustic OAM is typically generated via phase twisting in engineered metasurfaces.
  • Current methods for sound vortex manipulation are limited, necessitating advanced techniques.

Purpose of the Study:

  • To propose and theoretically investigate a diffraction mechanism for manipulating sound vortices.
  • To develop a generalized sound vortex diffraction law based on topological charge conservation.
  • To experimentally validate the proposed mechanism and its application in acoustic devices.

Main Methods:

  • Theoretical derivation of a sound vortex diffraction law using the generalized conservation principle of topological charge.
  • Numerical simulations to confirm the theoretical predictions of sound vortex diffraction.
  • Design and experimental verification of a phase gradient metagrating (PGM) using Helmholtz resonators.

Main Results:

  • A novel sound vortex diffraction law was theoretically revealed and numerically validated.
  • The PGM demonstrated asymmetric transmission of sound vortices.
  • The diffraction mechanism provides enhanced control over sound vortex manipulation.

Conclusions:

  • The proposed diffraction mechanism offers a powerful new method for manipulating sound vortices.
  • Phase gradient metagratings can be designed for advanced control of acoustic OAM.
  • This research opens new avenues for versatile OAM-based acoustic device design.