Abstract

The talk overviews the efforts to achieve negative refraction (NR) in visible and IR by systems, having negative group velocity: photonic crystals (PC) and other systems with strong spatial dispersion of dielectric function, such as gyrotropic crystals and polaritonic media. To search the NR in PCs the fluorescence of CdS and CdSe quantum dots (QD) impregnated into porous silica and polysterene opal photonic crystals have been compared for QDs of different sizes. Spatial distribution of light is visualized by confocal fluorescent microscopy for QDs emitting in blue, green and red spectral bands and compared for PCs matrices having photonic band gaps in different spectral bands. It is found that spatial distribution of fluorescence emission from single QDs and small aggregates of QD is significantly different for QD with fluorescent lines below, within and above PBG frequency in [111]direction.

© 2007 Optical Society of America