Search results for "D. Optical propertie"

showing 2 items of 2 documents

Synthesis and characterization of chalcogenide glasses from the system Ga-Ge-Sb-S and preparation of a single-mode fiber at 1.55 μm

2008

International audience; The aim of this work is to study different compositions in the Ga-Ge-Sb-S system for the definition of two compositions compatible with the elaboration of a single-mode fiber at the 1.55 μm telecom wavelength. The variations of the glass transition temperature (Tg), the dilatation coefficient (α) and the refractive index (n) have been studied for two glasses series: GaxGe25−xSb10S65 (series 1), Ga5Ge25−xSb10S60+x (series 2). This study has lead to the choice of the Ga4Ge21Sb10S65 composition as clad glass for the preparation of the single-mode fiber and Ga5Ge20Sb10S65 composition as the core. The discrepancies for the studied parameters between the core and clad comp…

A. ChalcogenidesMaterials scienceChalcogenideA. GlassesAnalytical chemistryMineralogy02 engineering and technology01 natural sciences010309 opticschemistry.chemical_compound0103 physical sciencesGeneral Materials ScienceFiberD. Optical propertiesMechanical EngineeringSingle-mode optical fiber[CHIM.MATE]Chemical Sciences/Material chemistryComposition (combinatorics)021001 nanoscience & nanotechnologyCondensed Matter PhysicsCore (optical fiber)WavelengthA. Optical materialschemistryMechanics of Materials[ CHIM.MATE ] Chemical Sciences/Material chemistry0210 nano-technologyGlass transitionRefractive index
researchProduct

Wide range excitation of visible luminescence in nanosilica

2010

The visible luminescence of nanometer-sized silica particles (7 nm mean diameter) was investigated using time resolved spectroscopy. This luminescence is characterized by a wide excitation in the visible and ultraviolet range. The emission spectrum is centred at 2.72 eV with a full width at half maximum of 0.70 eV when excited above 3.5 eV, whereas it progressively empties on the high energy side when excited below 3.5 eV. Moreover, the lifetime falls in the ns timescale and decreases on increasing the emission energy. These features are due to the exceptionally broad inhomogeneous distribution of the emitting centres peculiar to the silica nanoparticles. © 2010 Elsevier B.V. All rights res…

Materials Chemistry2506 Metals and AlloysRange (particle radiation)PhotoluminescenceMaterials scienceoptical down conversionChemistry (all)General ChemistrynanosilicaCondensed Matter PhysicCondensed Matter PhysicsA. NanostructureD. Optical propertieFull width at half maximumC. Point defectExcited stateMaterials ChemistryluminescenceSpontaneous emissionEmission spectrumAtomic physicsTime-resolved spectroscopyE. LuminescenceLuminescence
researchProduct