Creation of acoustic vortex knots

Hongkuan Zhang, Weixuan Zhang, Yunhong Liao, Xiaoming Zhou (), Junfei Li, Gengkai Hu and Xiangdong Zhang ()
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Hongkuan Zhang: Beijing Institute of Technology
Weixuan Zhang: Beijing Institute of Technology
Yunhong Liao: Beijing Institute of Technology
Xiaoming Zhou: Beijing Institute of Technology
Junfei Li: Duke University
Gengkai Hu: Beijing Institute of Technology
Xiangdong Zhang: Beijing Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Knots and links have been conjectured to play a fundamental role in a wide range of scientific fields. Recently, tying isolated vortex knots in the complex optical field has been realized. However, how to construct the acoustic vortex knot is still an unknown problem. Here we propose theoretically and demonstrate experimentally the creation of acoustic vortex knots using metamaterials, with decoupled modulation of transmitted phase and amplitude. Based on the numerical simulation, we find that the knot function can be embedded into the acoustic field by designed metamaterials with only 24 × 24 pixels. Furthermore, using the optimized metamaterials, the acoustic fields with Hopf link and trefoil knot vortex lines have been observed experimentally.

Date: 2020
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DOI: 10.1038/s41467-020-17744-x

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