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Information × Registration Number 0217U002115, 0115U004250 , R & D reports Title Development of methodological base and research of fast processes in nanostructured materials for high-speed optoelectronics. popup.stage_title Head Blonskyi Ivan Vasylyovych, Registration Date 19-01-2017 Organization Institute of physics NASU popup.description2 The object of study - the gold nanoparticles of different shapes in form of colloidal solutions and incorporated in solid dielectric matrix. Purpose - to study the nature and unsteady nonlinear optical phenomena of the interaction of femtosecond laser pulses with gold nanoparticles of different shapes. Research methods - dynamic light scattering, linear and nonlinear absorption spectroscopy, Raman spectroscopy and luminescence, electron and optical microscopy, mathematical modelling techniques, optical time-resolved methods in femto, picosecond time interval "Pump-probe" and "optical Kerr gate". Developed technology of production of colloidal solutions of nanoparticles Au by femtosecond laser ablation in liquids. It is shown that the formation of Au nanoparticles by laser pulse of 1200 fs duration is much better than 150 fs pulses, which is associated with a decrease in the nonlinear interaction of laser light with a solvent and scattering on laser-induced plasma. Improved methods created time-resolved "pump-probe" and "optical Kerr gate" to study the kinetics of nonlinear optical processes in subpicosecond time interval. Calculated and measured temporal resolution and efficiency of established techniques depending on the power of pump pulse. Investigated and separated the influence of cross-phase modulation, inverse Raman scattering and different arrival time of different spectral components of the pulse of white light in the spectral-kinetic studies in subpicosecond time interval. Found growth of relaxation time of heated charge carriers in Au nanoparticles with increasing of power of laser pulses, which explains by the increase in heat capacity of the electron gas during heating. The effect of changes in the shape of cylindrical nanoparticles Au under the influence of femtosecond radiation and its spectral-kinetic and optical is shown. It is shown that the detected differences in temporal dependencies of longitudinal and transverse plasmon bands due to the additional contribution to the transverse plasmon band of interband transitions of Au. Field of use - high-speed optoelectronic components; methods used in CCUE "Laser femtosecond complex". Product Description popup.authors Блонський Іван Васильович Гнатовський Олександр Володимирович Головченко Олена Миколаївна Держипольська Людмила Анатоліївна Дмитрук Ігор Миколайович Дмитрук Андрій Миколайович Зубрілін Микола Глібович Кадан Віктор Миколайович Коренюк Петро Іванович Мацнєв Ігор Вікторович Негрійко Анатолій Михайлович Передерій Олександр Олегович Потьомкіна Жанна В'ячеславівна Святенко Артем Ігоревич Удовицька Олена Григорівна Шинкаренко Євген Вікторович popup.nrat_date 2020-04-02 Close