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Ultrasonic metamaterials with negative modulus.

Nicholas Fang1, Dongjuan Xi, Jianyi Xu

  • 1Nano-scale Science and Engineering Center, 5130 Etcheverry Hall, University of California, Berkeley, California 94720-1740, USA.

Nature Materials
|May 2, 2006
PubMed
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Researchers developed novel ultrasonic metamaterials using Helmholtz resonators. These acoustic metamaterials exhibit negative modulus, enabling unique wave properties like backward group velocity, paving the way for advanced acoustic applications.

Area of Science:

  • Acoustics and Materials Science
  • Metamaterials Research

Background:

  • Electromagnetic metamaterials offer unique properties not found in nature.
  • Acoustic metamaterials analogous to electromagnetic ones have not been explored.
  • Subwavelength structures are key to achieving novel material responses.

Purpose of the Study:

  • To investigate and report a new class of ultrasonic metamaterials.
  • To explore the acoustic analogue of electromagnetic metamaterials.
  • To demonstrate unique wave propagation phenomena in acoustic metamaterials.

Main Methods:

  • Designing and fabricating ultrasonic metamaterials from subwavelength Helmholtz resonators.
  • Engineering acoustic inductance and capacitance within the resonator array.
  • Utilizing homogenized-media theory to calculate dispersion and transmission properties.

Related Experiment Videos

  • Conducting experimental verification of wave propagation characteristics.

    • Main Results:

    • Successfully created ultrasonic metamaterials with designed acoustic properties.
    • Observed negative effective dynamic modulus near the resonance frequency.
    • Experimentally confirmed acoustic waves with group velocity antiparallel to phase velocity.
    • Dispersion and transmission calculations showed good agreement with experimental data near 30 kHz.

    Conclusions:

    • The developed ultrasonic metamaterials exhibit unique wave behaviors due to their negative dynamic modulus.
    • These acoustic metamaterials support surface states with large wavevectors.
    • Potential applications include acoustic negative refraction and sub-diffraction superlensing.
    • This work opens new avenues for acoustic metamaterial research and applications.