Abstract
The transmission spectra at the high-symmetry points of the first Brillouin zone are measured for three face-centered-cubic colloidal crystals made of silica spheres of different submicrometer sizes. It is found that at the point the transmission dip exists not only for an wave, but also for a wave. Moreover, at the point the transmission dips of both and waves appear at the same wavelength. Our calculations confirm that these dips correspond to the lowest band gaps of the high-symmetry points. The structures and parameters of these crystals are determined by the Kossel-rings analysis as well as by the transmission spectra.
- Received 3 September 1997
DOI:https://doi.org/10.1103/PhysRevB.58.35
©1998 American Physical Society