Controlled disorder effect on the structure, bandgap and emission modification of three-dimensional photonic crystals

摘要

Controlled disorder is artificially introduced in self-assembled three-dimensional photonic crystals by adding large fluorescent spheres of different concentrations in the host suspension of small PS spheres during the growth process. Structural characterizations reveal the increase of disorder with the increase of doping concentration. Transmission and reflection spectra demonstrate the pronounced changes in the bandgaps of photonic crystals with different degrees of controlled disorder. The stop band gradually vanishes with the increased disorder, especially for the completely disordered nanostructure, the transmission and reflection intensity in the stop band both decrease to almost zero. The measured emission spectra show significant modification on emission intensity and frequency band of fluorescent spheres in partially disordered photonic crystals as compared to those of the highly ordered and completely disordered nanostructures. The proposed structure could provide a new approach for random lasing and strong Anderson localization.