Electric-field tuning of the Bragg peak in large-pore TiO2 inverse shell opals

E. Graugnard, J. S. King, S. Jain, C. J. Summers, Y. Zhang-Williams, I. C. Khoo

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75 Scopus citations

Abstract

Inverse opals with large connection pores were fabricated by infiltrating sintered polystyrene opal templates using low-temperature atomic layer deposition of TiO2 and subsequently dissolving the polystyrene in toluene. The dielectric lattice, consisting of overlapping air spheres in a TiO2 matrix, was then infiltrated with nematic liquid crystal, with some samples having received a prior hydrophobic surface treatment. The specular reflectance is shown to depend not only on electric-field amplitude, but also on film structure. In the hydrophobic-treated sample, a 20nm shift of the Bragg peak was observed for an applied electric field of 50kV/cm.

Original languageEnglish (US)
Article number233105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number23
DOIs
StatePublished - Dec 15 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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