Three-dimensionally periodic (3D) photonic crystals that operate in the optical frequency domain have become

a concrete reality – and evidence of full photonic bandgap behaviour has been demonstrated reasonably

convincingly. Techniques have been developed that make it possible to grow 3D photonic crystal structures over

large areas with sufficient perfection to be of interest for some areas of application. Understanding how 3D PhCs

can modify the emission of for example Cadmium Telluride (CdTe) semiconductor nano-dots with emission in

the visible can open new device possibilities. The key parameter in the modification of the emission is the extent

to which the PhC is infilled. By modifying the infilling procedure it is possible to limit the infill to several layers

of the PhC, thereby allowing the rest of the PhC to modify the emission