title: Photorefractive light needles in glassy nanodisordered KNTN.
abstract: We study the formation of 2D self-trapped beams in nanodisordered potassium-sodium-tantalate-niobate (KNTN) cooled below the dynamic glass transition. Supercooling is shown to accelerate the photorefractive response and enhance steady-state anisotropy. Effects in the excited state are attributed to the anomalous slim-loop polarization curve typical of relaxors dominated by non-interacting polar-nano-regions.
authors.forename: D
authors.initials: D
authors.lastname: Pierangeli
authors.forename: J
authors.initials: J
authors.lastname: Parravicini
authors.forename: F
authors.initials: F
authors.lastname: Di Mei
authors.forename: G B
authors.initials: GB
authors.lastname: Parravicini
authors.forename: A J
authors.initials: AJ
authors.lastname: Agranat
authors.forename: E
authors.initials: E
authors.lastname: DelRe
mesh_terms: D000497:Alloys / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D009339:Needles; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D000497:Alloys