Direct observation of the phonon dispersion of a three-dimensional solid/solid hypersonic colloidal crystal

Gaohua Zhu, Nichlas Z. Swinteck, Songtao Wu, Jin S. Zhang, Huihui Pan, Jay D. Bass, Pierre A Deymier, Debasish Banerjee, Kazuhisa Yano

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11 Scopus citations


We report on Brillouin measurements of the phonon dispersion relation of a three-dimensional hypersonic phononic crystal. The phononic crystal, comprised of close-packed polystyrene spheres embedded in a background matrix of solid polydimethylsiloxane, was fabricated using a self-assembly technique. The experimentally measured dispersion relation reveals the band folding effect and the formation of a band gap for longitudinal waves at the boundary of the Brillouin zone. Theoretical calculations, based on the finite element method and the finite-difference time-domain method, are employed to interpret experimentally observed phonon modes and provide insight on important features of the solid/solid hypersonic crystals.

Original languageEnglish (US)
Article number144307
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - Oct 22 2013


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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