Acoustic Vortex in Waveguide with Chiral Gradient Sawtooth Metasurface
arxiv(2023)
摘要
The acoustic vortex states with spiral phase dislocation that can carry
orbital angular moment (OAM) have aroused many research interests in recent
years. The mainstream methods of generating acoustic vortex are based on
Huygens-Fresnel principle to modulate the wavefront to create spatial spiral
phase dislocation. In this work, we propose an entirely new scenario to
generate acoustic vortex in a waveguide with chiral gradient sawtooth
metasurface. The physical mechanism of our method is to lift the degenerate
dipole eigenmodes through the scattering effect of the chiral surface
structure, and then the superposition of them will generate both and order
vortices in place. Compared to the existing methods of acoustic vortex
production, our design has many merits, such as easy to manufacture and
control, the working frequency is broadband, sign of vortex order can be
readily flipped. Both the full-wave simulations and experimental measurements
validate the existence of the acoustic vortices. The torque effect of the
acoustic vortices is also successfully performed by rotating a foam disk as a
practical application. Our work opens up a new route for generating acoustic
vortex and could have potential significances in microfluidics, acoustic
tweezers and ultrasonic communication, etc.
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