Negative refraction of acoustic waves in a two-dimensional phononic crystal via FDTD simulation

Tomoyuki Kurose, Kenji Tsuruta, Chieko Totsuji, Hiroo Totsuji

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Negative refraction of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finitedifference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in a liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. The negative refraction of the acoustic waves is observed at the interfaces between the phononic crystal slab and the liquid. We find that an acoustic "lens effect" with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure of the phononic crystal is quantitatively discussed.

Original languageEnglish
Pages (from-to)1004-1007
Number of pages4
JournalMaterials Transactions
Volume50
Issue number5
DOIs
Publication statusPublished - May 1 2009

Keywords

  • Finite-difference time-domain simulation
  • Negative refraction
  • Phononic crystal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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