Dispersion characteristics of negative refraction sonic crystals

Liang Yu Wu, Lien Wen Chen, Rex Ching Cheng Wang

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Dispersion characteristics of negative refraction sonic crystals are investigated. The plane wave expansion method is used to calculate the equifrequency surface; the dependences of refractive direction on frequencies and incident angles for triangular lattices are shown. There exist the positive and negative refractive waves which include k ·Vg ≥0 and k · Vg ≤0 in the second band for the triangular system. We also use the finite element method to demonstrate that the relative intensity of the transmitted acoustic waves is dependent on incident frequencies and angles. The positions of the partial band gaps obtained by the plane wave expansion method are in good agreement with those obtained by the finite element method. The sonic crystals with negative effective index are shown to have higher transmission intensities. By using the negative refraction behavior, we can design a sonic crystal plane lens to focus a sonic wave. Crown

Original languageEnglish
Pages (from-to)3599-3603
Number of pages5
JournalPhysica B: Condensed Matter
Issue number19-20
Publication statusPublished - 2008 Oct 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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