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Metamaterial with simultaneously negative bulk modulus and mass density.

Yiqun Ding1, Zhengyou Liu, Chunyin Qiu

  • 1Key Lab of Acoustic and Photonic materials and devices of Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.

Physical Review Letters
|October 13, 2007
PubMed
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This study introduces a novel metamaterial exhibiting simultaneous negative bulk modulus and mass density. This unique acoustic property arises from bubble-contained water spheres and rubber-coated gold spheres within an epoxy matrix.

Area of Science:

  • Acoustic metamaterials
  • Materials science
  • Solid mechanics

Background:

  • Metamaterials offer unique properties not found in natural materials.
  • Negative material properties, like negative bulk modulus and mass density, are of significant scientific interest.
  • Achieving simultaneous negative properties is a key challenge in metamaterial research.

Purpose of the Study:

  • To design and demonstrate a metamaterial with simultaneously negative bulk modulus and mass density.
  • To investigate the acoustic resonance phenomena responsible for these negative properties.
  • To explore the resulting negative Poisson's ratio in the metamaterial.

Main Methods:

  • Fabrication of a zinc blende structure metamaterial.
  • Incorporation of bubble-contained water spheres (BWSs) and rubber-coated gold spheres (RGSs) in an epoxy matrix.

Related Experiment Videos

  • Analysis of acoustic resonances (monopolar and dipolar) to determine material properties.

    • Main Results:

    • The metamaterial exhibited simultaneous negative bulk modulus and negative mass density.
    • Negative properties were attributed to coexistent monopolar resonances from BWSs and dipolar resonances from RGSs.
    • A negative Poisson's ratio was observed near the resonance frequency.

    Conclusions:

    • The developed metamaterial successfully demonstrates simultaneous negative bulk modulus and mass density.
    • The design utilizing BWSs and RGSs provides a viable pathway for creating advanced acoustic metamaterials.
    • This research opens possibilities for novel acoustic applications leveraging negative material properties.