Ge-Sb-S-Se-Te amorphous chalcogenide thin films towards on-chip nonlinear photonic devices.

Thanks to their unique optical properties Ge-Sb-S-Se-Te amorphous chalcogenide materials and compounds offer tremendous opportunities of applications, in particular in near and mid-infrared range. This spectral range is for instance of high interest for photonics or optical sensors. Using co-sputtering technique of chalcogenide compound targets in a 200 mm industrial deposition tool, we show how by modifying the amorphous structure of GeSbSSeTe chalcogenide thin films one can significantly tailor their linear and nonlinear optical properties.

Simple synthesis and characterization of vertically aligned BaSrTiO-CoFeO multiferroic nanocomposites from CoFe nanopillar arrays.

A new strategy to elaborate (1-3) type multiferroic nanocomposites with controlled dimensions and vertical alignment is presented. The process involves a supported nanoporous alumina layer as a template for growth of free-standing and vertically aligned CoFe nanopillars using a room temperature pulsed electrodeposition process. BaSrTiO-CoFeO multiferroic nanocomposites were grown through direct deposition of BaSrTiO films by radio-frequency sputtering on the top surface of the pillar structure, with in situ simultaneous oxidation of CoFe nanopillars.