Fabrication of large-area colloidal photonic crystals and their optical property

Toshimitsu Kanai, Tsutomu Sawada, Masatsugu Shimomura, Kenji Kitamura

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Charged colloidal particles are spontaneously organized into three-dimensional periodic arrays in a liquid medium. This ordered state is called a colloidal crystal and has received considerable attention with respect to its potential application, particularly, as photonic crystals. For practical use as photonic crystals, production of large single crystals is required. In this paper, we report a practical method of fabricating centimeter-sized uniform colloidal crystals with a high spectral quality by shear-induced orientation: a charge-stabilized colloidal suspension is driven by a pressure-regulated air pulse and run in a flat capillary. Above a critical pressure, a very uniform and transparent texture is attained. Optical characterization by ordinary spectroscopic methods, imaging spectroscopy, and Kossel line analysis indicate that almost all the capillary space is filled with a single-domain crystal with a fixed crystallographic orientation determined by the cell geometry. The flow-aligned sample also shows two-dimensional diffraction, from which the lattice constants can be accurately determined.

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalKOBUNSHI RONBUNSHU
    Volume64
    Issue number1
    DOIs
    Publication statusPublished - 2007 Jan

    Keywords

    • Bragg diffraction
    • Colloidal crystals
    • Imaging spectroscopy
    • Kossel analysis
    • Photonic crystals
    • Shear flow
    • Single crystal
    • Two-dimensional diffraction

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Materials Science (miscellaneous)
    • Environmental Science(all)
    • Polymers and Plastics

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