An Acoustic Meta‐Skin Insulator

Acoustic metamaterials with artificial microstructures are attractive to realize intriguing functions, including efficient waveguiding, which requires large impedance mismatches to realize total side reflection with negligible transmission and absorption. While large impedance mismatch can be readil...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2020-09, Vol.32 (37), p.e2002251-n/a
Main Authors: Tong, Lei, Xiong, Zhu, Shen, Ya‐Xi, Peng, Yu‐Gui, Huang, Xin‐Yu, Ye, Lei, Tang, Ming, Cai, Fei‐Yan, Zheng, Hai‐Rong, Xu, Jian‐Bin, Cheng, Gary J., Zhu, Xue‐Feng
Format: Article
Language:English
Subjects:
Acoustic coupling
Acoustic impedance
Acoustic insulation
acoustic metasurfaces
Acoustic waves
Acoustics
Angular momentum
Binary codes
Broadband
Communication cables
Data transmission
Electric cables
Hydrophobicity
Materials science
Metamaterials
Multiplexing
Polyvinylidene fluorides
superhydrophobicity
underwater acoustic waveguiding
Underwater acoustics
Vinylidene fluoride
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Summary:Acoustic metamaterials with artificial microstructures are attractive to realize intriguing functions, including efficient waveguiding, which requires large impedance mismatches to realize total side reflection with negligible transmission and absorption. While large impedance mismatch can be readily realized in an air environment, acoustic waveguiding in an underwater environment remains elusive due to insufficient impedance mismatch of state‐of‐the‐art metamaterials. Here, a superhydrophobic acoustic metasurface of microstructured poly(vinylidene fluoride) membrane, referred to as a “meta‐skin” insulator, which is able to confine acoustic waves in an all‐angle and wide spectrum range due to tremendous impedance mismatch at stable air/water interfaces, viz., the Cassie–Baxter state is demonstrated. By utilizing the meta‐skin insulator with broadband and high throughput, orbital‐angular‐momentum multiplexing at a high spectral efficiency and binary coding along large‐angle bending channels for bit‐error‐free acoustic data transmission in an underwater environment are demonstrated. Very different from optical and/or electrical cable communications, acoustic waves can be simply and effectively coupled into remote meta‐skin acoustic fibers from free space, which is technologically significant for long‐haul and anti‐interference communication. This work can enlighten many fluidic applications based on efficient waveguiding, such as in vivo ultrasound medical treatment and imaging. Underwater acoustic wave confinement in an all‐angle and wide spectrum range can be realized in a meta‐skin insulator due to the tremendous impedance mismatch originating from the stable Cassie–Baxter state. Acoustic‐wave‐based underwater orbital‐angular‐momentum multiplexing and binary coding are implemented, which is promising for long‐haul and anti‐interference communication. This work also benefits in vivo ultrasound medical treatment and imaging.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202002251