Lamb waves in phononic crystal slabs with square or rectangular symmetries

  • Brunet T
  • Vasseur J
  • Bonello B
 et al. 
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Abstract

We report on both numerical and experimental results showing the occurrence of band gaps for Lamb waves propagating in phononic crystal plates. The structures are made of centered rectangular and square arrays of holes drilled in a silicon plate. A supercell plane wave expansion method is used to calculate the band structures and to predict the position and the magnitude of the gaps. The band structures of phononic crystal slabs are then measured using a laser ultrasonic technique. Lamb waves in the megahertz range and with wave vectors ranging over more than the first two reduced Brillouin zones are investigated. © 2008 American Institute of Physics.

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Authors

  • Thomas Brunet

  • J́rôme Vasseur

  • Bernard Bonello

  • Bahram Djafari-Rouhani

  • Anne Christine Hladky-Hennion

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