Realization of acoustic spin transport in metasurface waveguides

Yang Long, Danmei Zhang, Chenwen Yang, Jianmin Ge, Hong Chen and Jie Ren ()
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Yang Long: Tongji University
Danmei Zhang: Tongji University
Chenwen Yang: Tongji University
Jianmin Ge: Tongji University
Hong Chen: Tongji University
Jie Ren: Tongji University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Spin angular momentum enables fundamental insights for topological matters, and practical implications for information devices. Exploiting the spin of carriers and waves is critical to achieving more controllable degrees of freedom and robust transport processes. Yet, due to the curl-free nature of longitudinal waves distinct from transverse electromagnetic waves, spin angular momenta of acoustic waves in solids and fluids have never been unveiled only until recently. Here, we demonstrate a metasurface waveguide for sound carrying non-zero acoustic spin with tight spin-momentum coupling, which can assist the suppression of backscattering when scatters fail to flip the acoustic spin. This is achieved by imposing a soft boundary of the π reflection phase, realized by comb-like metasurfaces. With the special-boundary-defined spin texture, the acoustic spin transports are experimentally manifested, such as the suppression of acoustic corner-scattering, the spin-selected acoustic router with spin-Hall-like effect, and the phase modulator with rotated acoustic spin.

Date: 2020
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DOI: 10.1038/s41467-020-18599-y

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