Charge stabilized crystalline colloidal arrays as templates for fabrication of non-close-packed inverted photonic crystals

Justin J. Bohn, Matti Ben-Moshe, Alexander Tikhonov, Dan Qu, Daniel N. Lamont, Sanford A. Asher

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We developed a straightforward method to form non-close-packed highly ordered fcc direct and inverse opal silica photonic crystals. We utilize an electrostatically self assembled crystalline colloidal array (CCA) template formed by monodisperse, highly charged polystyrene particles. We then polymerize a hydrogel around the CCA (PCCA) and condense silica to form a highly ordered silica impregnated (siPCCA) photonic crystal. Heating at 450 °C removes the organic polymer leaving a silica inverse opal structure. By altering the colloidal particle concentration we independently control the particle spacing and the wall thickness of the inverse opal photonic crystals. This allows us to control the optical dielectric constant modulation in order to optimize the diffraction; the dielectric constant modulation is controlled independently of the photonic crystal periodicity. These fcc photonic crystals are better ordered than typical close-packed photonic crystals because their self assembly utilizes soft electrostatic repulsive potentials. We show that colloidal particle size and charge polydispersity has modest impact on ordering, in contrast to that for close-packed crystals.

Original languageEnglish
Pages (from-to)298-307
Number of pages10
JournalJournal of Colloid and Interface Science
Volume344
Issue number2
DOIs
Publication statusPublished - Apr 15 2010
Externally publishedYes

Keywords

  • CCA
  • Electrostatic stabilization
  • Inverted
  • Non-close-packed
  • PCCA
  • Photonic crystal
  • siPCCA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Charge stabilized crystalline colloidal arrays as templates for fabrication of non-close-packed inverted photonic crystals'. Together they form a unique fingerprint.

Cite this