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    Insertion of a Two-Dimensional Cavity into a Self-Assembled Colloidal Crystal

    Year: 2003

    Journal: Langmuir 2003, 19, 4465-4468, 20111221

    Authors: Kurt Wostyn, Yuxia Zhao, Gaetan de Schaetzen, Louis Hellemans, Naoki Matsuda, Koen Clays, and Andre Persoons

    Organizations: Laboratory of Chemical and Biological Dynamics, Department of Chemistry, University of Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium, and Nanoarchitectonics Research Center (NARC), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

    Aplanar microcavity has been inserted into a self-assembled colloidal crystal by a combination of convective self-assembly in a vertical geometry and the Langmuir-Blodgett technique. This planar cavity, which is parallel to the "111" π planes, induces the appearance of a localized state, a pass band, into the forbidden band gap. We have experimentally determined the optical properties of this defect. The dependence of the position of the localized state is investigated as a function of the thickness of the defect layer. It is found that the defect behaves as a donor impurity, as it originates in the conduction band. Analogously, the crystal surrounding a constant defect layer can be varied. It is also found that the pass band depends on the thickness of the surrounding crystal of the planar defect.