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Far-field phonon coupling in valley metamaterial circuits
Yao Huang1, Weitao Yuan2, Zhiwei Guo3
1School of Aerospace Engineering and Applied Mechanics, Tongji University, 100 Zhangwu Road, Shanghai, 200092, China.
Nature Communications
|December 11, 2025
Summary
Researchers demonstrated broadband far-field phonon coupling using a novel Dirac strip cavity, overcoming near-field limitations. This scalable phononic platform enables robust, multiplexed wave manipulation for topological processors.
Area of Science:
- Acoustic Metamaterials
- Topological Photonics
- Quantum Acoustics
Background:
- On-chip whispering-gallery-mode cavities are crucial for manipulating bosonic waves.
- Current methods predominantly rely on near-field evanescent coupling, limiting versatility.
- Overcoming these limitations is key for advanced wave-based processors.
Purpose of the Study:
- To experimentally demonstrate broadband far-field phonon coupling.
- To integrate a valley metamaterial cavity with a Dirac-cone waveguide (Dirac strip).
- To explore applications in non-Hermitian dynamics and topological wave processing.
Main Methods:
- Fabrication of a valley metamaterial cavity integrated with a Dirac strip waveguide.
- Experimental verification using transmission spectroscopy.
- Spatiotemporal field mapping to confirm far-field coupling over extended distances.
Main Results:
- Successful demonstration of broadband far-field phonon coupling up to five wavelengths.
- Achieved multiplexed and distance-robust coupling pathways, surpassing near-field constraints.
- Controlled non-Hermitian dynamics via sympathetic resonances by combining near-field and far-field cavities.
Conclusions:
- Established a scalable phononic platform for versatile far-field coupling.
- The Dirac strip enables robust, long-range phonon interactions.
- Paves the way for parallel topological wave processors and advanced quantum acoustic devices.
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