Abstract
We have studied optical properties of opaline thin films grown by the vertical deposition method. The opaline films under study were three-dimensional close-packed arrangements of a-SiO2 spheres. The fcc domains, which are of 10–50 μm in size and separated by cracks, were seen in FE-SEM images. Analysis of angle-resolved transmissivity of opaline films shows that they act as three-dimensional photonic crystals. Photonic stop-bands were observed and attributed to the {111} family of crystallographic planes. Crystallographic structure of the films was characterized as twinned fcc, in which twins are spatially separated by cracks.
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