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Combinatorial asymmetric acoustic metamaterials with real-time programmability.

Melanie R Keogh1, Osama R Bilal1

  • 1School of Mechanical, Aerospace, and Manufacturing Engineering, University of Connecticut, Storrs, CT 06269.

Proceedings of the National Academy of Sciences of the United States of America
|November 24, 2025
PubMed
Summary

This study introduces a new programmable metamaterial framework using asymmetric pillars that can be reconfigured in real-time to control acoustic waves. This scalable approach enables on-demand manipulation of sound for advanced acoustic devices.

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Area of Science:

  • Acoustic Metamaterials
  • Materials Science
  • Wave Manipulation

Background:

  • Metamaterials offer unique properties but are typically fixed post-fabrication.
  • On-demand tunability of metamaterials remains a significant challenge.
  • Existing tunable metamaterials lack scalability and real-time programmability.

Purpose of the Study:

  • To introduce a real-time programmable, combinatorial metamaterial framework for acoustic wave manipulation.
  • To demonstrate the utility of asymmetric pillars with controllable angular orientation.
  • To explore scalable tuning mechanisms for advanced acoustic devices.

Main Methods:

  • Designed a metamaterial framework using asymmetric pillars with adjustable angular orientation.
  • Utilized individual motors for unit-cell level programmability and gears for domain-level control.
Keywords:
acoustic metamaterialsactive materialscombinatorial designsound wavessymmetry

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  • Implemented a hybrid approach combining motors and gears for balanced versatility and simplicity.
  • Investigated wave attenuation, localization, and topological insulation phenomena.

    • Main Results:

    • Demonstrated acoustic wave manipulation through pillar reorientation.
    • Achieved wave attenuation, localization, and topological insulation.
    • Expanded designs to multiple domains and supercells, vastly increasing design possibilities.
    • Showcased real-time programmability at both unit-cell and domain levels.

    Conclusions:

    • The proposed framework offers scalable, on-demand reprogrammability of acoustic properties.
    • This approach facilitates the development of versatile and advanced acoustic devices.
    • The combinatorial nature of the design allows for a vast number of configurations.