Hysteretic self-oscillatory acoustic radiation with tunable orbital angular momentum.

ABSTRACT: Vortex beams carrying orbital angular momentum (OAM) have attracted growing attention across fields, including optics and acoustics, for potential applications in particle manipulation and high-speed communication. Intracavity generation of OAM beams, such as OAM lasers, efficiently produces high-power, high-beam-quality vortices. This scheme, however, remains rarely explored in acoustics. Here, we propose and demonstrate an acoustic intracavity OAM generation mechanism with tunable topological charges via a single nonreciprocal nonlinear boundary in a compact resonator ring. In the linear regime, the boundary creates non-Hermitian complex effective magnetic fields piercing the ring, leading to a non-Hermitian Zeeman-like effect that splits clockwise and counterclockwise eigenmodes. Upon i

SUBMITTER: Zhang L 

PROVIDER: S-EPMC12758511 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature