Photon localization in metal oxides with controlled morphology anddevelopment of optical functional materials using light interference

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Porous oxide materials with controlled morphology have been fabricated using the sol-gel method accompanied by phase separation in order to examine the transport properties of photon. When high-refractive-index TiO_2 porous materials are combined with solution containing organic dye, random laser oscillation is observed as a result of the photon localization. The research on Ce^<3+>: YAG porous materials revealed that some surface defects induce the photoreaction of Ce^<3>+, which results in a novel optical function exemplified by a scattering-based hole burning effect. As the related phenomenon, it is also found that the combination of metal-dielectric core-shell nanoparticles and organic dye solution serves as the random lasing media with low threshold.