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Hybrid Metasurfaces for Perfect Transmission and Customized Manipulation of Sound Across Water-Air Interface.
Hong-Tao Zhou1, Shao-Cong Zhang1, Tong Zhu1
1Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin, 300350, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 20, 2023
Summary
Researchers developed impedance-matched hybrid metasurfaces to overcome sound insulation at water-air interfaces. This breakthrough enhances acoustic transmission for ocean-air communication and other cross-media applications.
Area of Science:
- Acoustics
- Materials Science
- Metamaterials
Background:
- Extreme impedance mismatch at water-air interfaces causes significant sound insulation, hindering cross-media acoustic applications like underwater-to-air wireless communication.
- Conventional quarter-wave impedance transformers offer limited solutions for acoustics due to unavailability and fixed phase shift limitations.
Purpose of the Study:
- To overcome the limitations of sound transmission across water-air interfaces.
- To achieve independent sound transmission enhancement and phase modulation.
- To enable efficient acoustic communication and energy transfer between dissimilar media.
Main Methods:
- Utilized topology optimization to design impedance-matched hybrid metasurfaces.
- Developed metasurfaces capable of independent control over sound transmission amplitude and phase.
- Experimentally validated the performance of the designed metasurfaces.
Main Results:
- Achieved significant sound transmission amplitude enhancement across the water-air interface, with an average increase of ≈25.9 dB compared to the bare interface.
- Demonstrated up to 42 dB amplitude enhancement using hybrid metasurfaces with axial focusing capabilities.
- Successfully generated customized vortex beams for advanced ocean-air communication applications.
Conclusions:
- The proposed impedance-matched hybrid metasurfaces effectively break the sound insulation barrier at water-air interfaces.
- The technology enables independent control of acoustic transmission and phase, paving the way for novel cross-media applications.
- This approach holds significant potential for efficient acoustic transmission and wireless communication across diverse media.
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