Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps

Songtao Wu, Gaohua Zhu, Jin S. Zhang, Debasish Banerjee, Jay D. Bass, Chen Ling, Kazuhisa Yano

Research output: Contribution to journalArticle

Abstract

We report anisotropic expansion of self-assembled colloidal polystyrene-poly(dimethylsiloxane) crystals and its impact on the phonon band structure at hypersonic frequencies. The structural expansion was achieved by a multistep infiltration-polymerization process. Such a process expands the interplanar lattice distance 17% after 8 cycles whereas the in-plane distance remains unaffected. The variation of hypersonic phonon band structure induced by the anisotropic lattice expansion was recorded by Brillouin measurements. In the sample before expansion, a phononic band gap between 3.7 and 4.4 GHz is observed; after 17% structural expansion, the gap is shifted to a lower frequency between 3.5 and 4.0 GHz. This study offers a facile approach to control the macroscopic structure of colloidal crystals with great potential in designing tunable phononic devices. This journal is

Original languageEnglish (US)
Pages (from-to)8921-8926
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number19
DOIs
StatePublished - May 21 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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