title: Photorefractivity in nanostructured tin-silicate glass ceramics: a radiation-induced nanocluster size effect.
abstract: The possibility of obtaining permanent photoinduced refractive index changes, up to -10(-3), in nanostructured silica-based composites has been demonstrated in SiO(2):SnO(2) optical-grade glass ceramics exposed to ultraviolet radiation. Optical and electron paramagnetic resonance data suggest that the negative refractive index change involves a modification at the surface of the SnO2 nanoclusters, leading to a reduction of their crystalline size.
authors.affiliation: Istituto Nazionale Fisica della Materia - Department of Material Science, University of Milano-Bicocca, via Cozzi 53, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Chiodini
authors.forename: A
authors.initials: A
authors.lastname: Paleari
authors.forename: G
authors.initials: G
authors.lastname: Spinolo