Structure and Band Gap of Silica Colloidal Crystals Fabricated Through Self-assembly Method

Photonic crystal is a new kind of functional materials. In this paper, a vertical deposition self-assembly technique which relies on capillary forces to organize silica colloidal is used to fabricate colloidal crystal multilayer. And the films are characterized by reflection spectra and scanning electronic microscope(SEM). The results suggest that the colloidal crystals are in FCC structure and the distinct peaks of the reflect spectra in the visible regions are due to the existence of photonic band-gap.