Classes of colloidal dielectric systems are found with full three-dimensional photonic band gaps, using photonic band-structure calculations. The fcc structure composed from either high dielectric spheres or low dielectric spheres has three-dimensional band gaps and lower-frequency pseudogaps. The $\mathrm{AB}2\mathrm{}$ structure has a higher-frequency pseudogap.

• Received 18 July 1997

DOI:https://doi.org/10.1103/PhysRevB.57.3701