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Double-negative acoustic metamaterial.

Jensen Li1, C T Chan

  • 1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 17, 2004
PubMed
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Researchers demonstrate a novel acoustic metamaterial with simultaneously negative effective density and bulk modulus. This double-negative acoustic system exhibits unique properties, including a negative refractive index, analogous to electromagnetic metamaterials.

Area of Science:

  • Acoustics
  • Metamaterials
  • Condensed Matter Physics

Background:

  • Acoustic metamaterials offer unique wave manipulation properties.
  • Veselago's medium in electromagnetism exhibits negative refractive index.
  • Simultaneous negative effective density and bulk modulus in acoustics is theoretically challenging.

Purpose of the Study:

  • To demonstrate the existence of an acoustic metamaterial with simultaneously negative effective density and bulk modulus.
  • To establish an acoustic analogue of Veselago's electromagnetic medium.
  • To investigate the unique consequences, such as negative refractive index, in this acoustic system.

Main Methods:

  • Design and fabrication of a resonant acoustic metamaterial structure.
  • Characterization of the effective acoustic properties (density and bulk modulus) through low-frequency resonance.

Related Experiment Videos

  • Analysis of wave propagation and refractive properties within the metamaterial.

    • Main Results:

    • Experimental confirmation of simultaneously negative effective density and bulk modulus in the acoustic metamaterial.
    • Observation of a negative refractive index, consistent with Veselago's medium.
    • Identification of a single resonance structure responsible for double negativity, distinct from electromagnetic counterparts.

    Conclusions:

    • The study confirms the existence of double-negative acoustic metamaterials in the strict sense of an effective medium.
    • This acoustic system serves as a direct analogue to electromagnetic Veselago media, opening new avenues for acoustic wave control.
    • The findings highlight a novel mechanism for achieving double negativity in acoustics via a single resonance structure.