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Information × Registration Number 0219U005191, 0115U004249 , R & D reports Title Atomic, molecular and nanoscale structures in gradient laser fields: mechanisms of formation, optical and laser properties, application in spectroscopy, laser technology and sensorics. popup.stage_title Head Yatsenko Leonid Petrovich, Registration Date 18-06-2019 Organization Institute of physics NASU popup.description2 The object of study - atoms, molecules and nanoparticles in the light field; developed by the authors a light-sensitive photopolymer composite that allows the production of periodic structures of polymer-nanoparticles (LF) of silver by holographic lithography. Purpose - study of the motion of atoms, molecules and nanoparticles in the field of opposing waves. Investigation of the influence of structuring of polymer nanocomposite with nanoparticles of silver on their nonlinear properties. Research methods - analysis of processes of resonance interaction of laser radiation with atoms and molecules by means of modeling of wave function by the Monte Carlo method and density matrix. Description of the mechanical motion of atoms and molecules using the Newton equations. Application of the Monte Carlo method for computing the statistical characteristics of an ensemble of atoms. The nonlinear-optical characteristics of the structures based on the polymer nanocomposite with LF silver were measured by the Z-scanning method. Results - The study of the motion of atoms in the field of cross-standing bichromatic waves has been carried out. The motion of atoms was described by the Newton equations, their internal state - by the Monte Carlo method for the wave function. It has been shown that cross-standing bichromatic waves can form a two-dimensional trap for atoms with a center at the point where the phases of all monochromatic running colliding light waves forming the cross-standing bichromatic waves are the same. It has been shown that trapped atoms can form a spatial structure. Numerical simulation has been carried out for parameters corresponding to the interaction of sodium atoms with the field. The properties of volumetric periodic structures formed by silver nanoparticles in a polymer matrix has been investigated. It has been determined 1) the periodic structure is formed by alternation of pure polymeric phase and polymer phase, enriched by silver NP; 2) the region of localization of NP corresponds to the minima of the interference pattern; 3) the profile of the local optical density of a one-dimensional structure, which is formed during polymerization in a sinusoidal interference field, indicates a non-sinusoidal distribution of silver NP. The quantum efficiency of luminescence in regions of a hologram with a low concentration of silver NP significantly exceeds the luminescence efficiency of regions enriched silver NP. The formation in the polymeric phase, which corresponds to the intermediate pattern maximum, clusters of silver with a size less than 1 nm, which have luminescent properties is the most probable explanation of the spatial distribution of luminescence. It has been received the enhancement of luminescence and Raman scattering for graphene by the addition of gold "nanoaging", indicating the promise of using of the metal-graphene complex for both MEF and SERS spectroscopy. Product Description popup.authors Єжов Павло Валентинович Гринь Володимир Олександрович Лямець Олександр Костянтинович Мамута Олександр Дмитрович Романенко Віктор Іванович Смірнова Тетяна Миколаївна Фесенко Олена Мар'янівна Ходаковський Володимир Михайлович Яремкевич Андрій Яценко Леонід Петрович popup.nrat_date 2020-04-02 Close