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Information × Registration Number 0217U004195, 0116U002822 , R & D reports Title Energy transformation of electromagnetic wave on laser-induced quasi-grating and nanodispersed structures popup.stage_title Head Dmitruk Igor Mykolayovych, Registration Date 20-01-2017 Organization Taras Shevchenko Kiev University popup.description2 The morphology and properties of quasi grating structures on the surface of metals (copper, gold, titanium, tungsten), inert alloys (stainless steel, aluminum-silicon alloy) and composites "metal-semiconductor" obtained by the surface treatment of materials with femtosecond laser pulses have been characterized by means of scanning microscopy, light scattering and optical spectroscopy. The dependence of the characteristics of the surface laser-induced structures on the laser-processing regime has been determined with the aim of the preparation of quasi grating structures with predetermined parameters. The gain coefficient of Raman scattering of organic dye deposited on the laser-induced metal structures has been determined depending on the laser-processing regime. It is shown that low-frequency shift of phonon lines in Raman spectra of the composite sample of gold-silicon is caused by the quantum size effect confirming the formation of the silicon nanoislands during laser processing of the sample surface. It is found the threshold phenomenon of transformation of gold nanocylinders, namely their transformation into spherical particles, under the influence of femtosecond laser radiation of high power. Practical recommendations for formation of laser-induced surface structures with predetermined parameters have been formulated. Product Description popup.authors Безручко Інна Володимирівна Березовська Наталія Іванівна Віхрова Елизавета Андріївна Становий Олександр Петрович popup.nrat_date 2020-04-02 Close