An ordered colloidal structure of SiO 2 spheres of 0.33 μm diameter has been formed in distilled water. It is a face-centered cubic structure with a lattice constant of 0.54 μm and a volume fraction of 0.48, as determined by the Kossel rings analysis. The light transmission in the [111] direction exhibited a dip located at 11600 cm -1 . A plane wave expansion method is used to calculate the lowest gap at the L point. The gap center coincides quite well with the measured transmission dip.
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Mei et al. (1998) studied this question.
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