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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
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Acoustic Orbital Angular Momentum Hall Effect at Metasurfaces.

Xinyue Gong1, Joao L Ealo1,2, Likun Zhang1

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Researchers observed the acoustic orbital Hall effect using airborne vortex beams. This study measures extrinsic orbital angular momentum (OAM) and reveals new insights into acoustic Hall phenomena and metasurface applications.

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Area of Science:

  • Acoustics
  • Metasurfaces
  • Quantum Optics

Background:

  • Orbital angular momentum (OAM) plays a crucial role in wave phenomena.
  • Metasurfaces offer novel ways to manipulate wave properties.
  • Acoustic Hall effects are less explored compared to optical counterparts.

Purpose of the Study:

  • To experimentally observe and characterize the acoustic orbital Hall effect.
  • To investigate the role of extrinsic orbital angular momentum (OAM) in acoustic metasurfaces.
  • To establish a framework for acoustic Hall effect measurements.

Main Methods:

  • Generation of airborne vortex beams using a four-speaker source.
  • Direct experimental measurement of Hall-induced extrinsic OAM.
  • Field decomposition for analyzing energy flow and angular momentum symmetry.

Main Results:

  • First direct experimental observation of the acoustic orbital Hall effect at metasurfaces.
  • Measurement of twist-dependent Imbert-Fedorov shifts as a signature of extrinsic OAM.
  • Observation of coexisting transverse energy flow and reconstructed axial angular-momentum symmetry.
  • Detection of a geometric Hall effect in the tilted refracted beam.

Conclusions:

  • The study provides a novel framework for measuring and interpreting acoustic Hall phenomena.
  • Findings offer insights into extrinsic and intrinsic OAM in realistic acoustic systems.
  • Advances potential applications in OAM-metasurface technology.