Electric-Field Tuning of the Bragg Peak in Large-Pore TiO2 Inverse Shell Opals

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

Research output: Contribution to journalArticlepeer-review

82 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 20 nm shift of the Bragg peak was observed for an applied electric field of 50 kV∕cm.
Original languageAmerican English
Article number233105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number23
DOIs
StatePublished - 13 Dec 2005
Externally publishedYes

EGS Disciplines

  • Mechanical Engineering

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