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All-angle unidirectional flat-band acoustic metasurfaces.
Chenglin Han1,2,3,4, Shida Fan1, Hong-Tao Zhou3,5
1School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China.
Nature Communications
|January 13, 2025
Summary
Researchers developed an acoustic metasurface enabling controllable, unidirectional sound canalization. This breakthrough allows flexible control over sound propagation angles, unlike previous fixed bidirectional systems.
Area of Science:
- Acoustics
- Condensed Matter Physics
- Materials Science
Background:
- Flat bands in lattices enable phenomena like robust canalization.
- Symmetry protection typically leads to fixed, bidirectional canalization in acoustic or photonic systems.
Purpose of the Study:
- To engineer an acoustic flat-band metasurface for unidirectional canalization.
- To achieve tunable band alignment and control over canalization angles.
Main Methods:
- Designed a bilayer acoustic metasurface.
- Manipulated twist, tilt, and skew angles to break spatial symmetries.
- Investigated the resulting flat-band properties and canalization behavior.
Main Results:
- Demonstrated unidirectional canalization at all in-plane angles.
- Achieved robust tunability in band alignment.
- Identified 'magic angles' for arbitrary twist angles, enabling full control.
Conclusions:
- The developed metasurface overcomes limitations of fixed bidirectional canalization.
- Offers unprecedented control over acoustic wave propagation.
- Paves the way for higher-dimensional moiré physics and advanced acoustic/optical devices.
