Numerical simulation of a coarsening two-dimensional network

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THE INFLUENCE OF SAMPLE STRUCTURE ON THE OPTICAL PROPERTIES OF SOLIDS

On discute l'influence de la structure en surface et en volume sur les propriétés optiques des solides. On considère essentiellement les échantillons métalliques, et plus particulièrement les mécanismes d'absorption additionnelle introduits par l'excitation des plasmons de surface puisque leur effet sur les spectres optiques est le plus prononcé.We discuss the influence of surface and internal structure on the optical properties of solids. The emphasis is on metal samples and particularly on additional absorption mechanisms caused by the excitation of surface plasmons since these have the most pronounced effect on the optical spectra

Selective surface/interface characterization of thin garnet films by magnetization-induced second-harmonic generation

Contains fulltext : 60725.pdf ( ) (Open Access)Magnetization-induced second-harmonic generation (SHG) has been used for the study of thin garnet films. The strong optical absorption of these films at the second harmonic frequency provides a unique possibility to study magnetic and structural properties of the film surface and film/substrate interface separately. When studied in transmission at normal incidence all relevant elements of the crystallographic part of the nonlinear optical susceptibility tensor vanish identically, while a magnetization-induced contribution remains. The purely magnetic origin of SHG from the interface is unambiguously demonstrated. From measurements of the SHG rotational anisotropy and magnetic field dependence, the surface is found to have inclusions which act as nonmagnetic sources of SHG, while the anisotropy causing easy in-plane magnetization is found to be stronger at the interface with the substrate than at the surface of the film

AUGER AND ELLIPSOMETRIC INVESTIGATION OF THE OXIDATION KINETICS OF SOME METALLIC GLASSES

The oxidation kinetics of two metallic glasses have been studied by ellipsometry and Auger Electron spectroscopy. We have found that the presence of chromium in Fe based alloys has a marked influence on the thickness of corrosion film formed and on the kinetics of film formation