Two-Dimensional Phononic Crystals With Acoustic-Band Negative Refraction

  title={Two-Dimensional Phononic Crystals With Acoustic-Band Negative Refraction},
  author={H. Sadeghi and Sia Nemat-Nasser},
A two-dimensional phononic crystal (PC) can exhibit longitudinal-mode negative energy refraction on its lowest (acoustical) frequency pass band. The effective elastodynamic properties of a typical PC are calculated and it is observed that the components of the effective density tensor can achieve negative values at certain low frequencies on the acoustical branches for the longitudinal-mode pass-band, and that negative refraction may be accompanied by either positive or negative effective… 


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Anti-plane shear waves in periodic elastic composites: band structure and anomalous wave refraction
  • S. Nemat-Nasser
  • Materials Science, Physics
    Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2015
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