Photo-induced birefringence and surface ripples structures in As-S-Ag chalcogenide thin-films
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Data
2019-09-01
Autores
Douaud, Alexandre
Messaddeq, Sandra Helena
Messaddeq, Younès
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Resumo
Photo-induced phenomena are investigated in new metastable Agx(As20S80)100-x chalcogenide thin-films prepared by the co-evaporation technique. Under irradiation using an Ar laser at 488 nm, periodic ripples structures formation are observed inside of the irradiated spot. With an increasing irradiation time or power density, a characteristic evolution of ripples is observed from a random structure to a series of generally aligned peaks-and-valleys periodic structures until a complete break-up of the film (laser dewetting). The scanning electron microscopy (SEM) of irradiated areas shows periodic ripples are aligned perpendicularly to the electric field vector of the incident light. Moreover, photo-induced birefringence (PIB) is observed during ripples formation. The kinetics of structural changes during the irradiation of the films is analysed using Raman spectroscopy. The molecular rearrangement from sulphur-cis toward sulphur-trans through irradiation is proposed to explain the experimentally observed PIB.
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Chalcogenide, Glass, Photo-induced birefringence, Silver, Thin-films
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Journal of Non-Crystalline Solids, v. 519.