Non-Divergent Spinning Substructures Near Acoustic Field Nodes
arxiv(2024)
摘要
In this work, we examine the extraordinary behavior of polarization and spin
angular momentum (AM) density in the vicinity of longitudinal field zeros in
three-dimensional monochromatic acoustic fields. We demonstrate that, as
governed by the continuity equation, the velocity fields of arbitrary acoustic
sources maintain non-diffractive elliptical polarization structures that
enclose longitudinal field zeros, despite having divergent transverse spatial
profiles of intensity. Furthermore, embedded in these nonparaxial field
contours, for infinite distance, are threads of circular polarization
singularities. We illuminate these inherent properties in acoustic vortex
fields, dipole arrays, and the famous Young's double slit experiment. Our
results reveal novel characteristics of vector sound waves that provide a
platform for future studies and applications of structured acoustic waves and
chiral acoustic phenomena.
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