Directional Acoustic Bulk Waves in a 2D Phononic Crystal

Pierre A. Deymier, Jérôme O. Vasseur, Keith A Runge, Krishna Muralidharan, Alexander Khanikaev, Andrea Alù

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We used the transfer matrix method to investigate the conditions supporting the existence of directional bulk waves in a two-dimensional (2D) phononic crystal. The 2D crystal was a square lattice of unit cells composed of rectangular subunits constituted of two different isotropic continuous media. We established the conditions on the geometry of the phononic crystal and its constitutive media for the emergence of waves, which, for the same handedness, exhibited a non-zero amplitude in one direction within the crystal’s 2D Brillouin zone and zero amplitude in the opposite direction. Due to time-reversal symmetry, the crystal supported propagation in the reverse direction for the opposite handedness. These features may enable robust directional propagation of bulk acoustic waves and topological acoustic technology.

Original languageEnglish (US)
Article number674
JournalCrystals
Volume14
Issue number8
DOIs
StatePublished - Aug 2024

Keywords

  • directional waves
  • phononic crystal
  • topological acoustics

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Inorganic Chemistry

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