A5051521024- Nonlinear Optical Materials Studies
- Laser Material Processing Techniques
- Particle Accelerators and Free-Electron Lasers
- Photopolymerization techniques and applications
- Phase-change materials and chalcogenides
- Laser-Ablation Synthesis of Nanoparticles
- Near-Field Optical Microscopy
- Advanced X-ray Imaging Techniques
- Diamond and Carbon-based Materials Research
- Silicon Carbide Semiconductor Technologies
- Material Properties and Applications
- Quantum Dots Synthesis And Properties
- Catalysis and Oxidation Reactions
- Photonic Crystals and Applications
- TiO2 Photocatalysis and Solar Cells
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Polymer Nanocomposite Synthesis and Irradiation
- Drilling and Well Engineering
- Structural mechanics and materials
- Photochromic and Fluorescence Chemistry
- Semiconductor materials and devices
- Biocrusts and Microbial Ecology
- Nanocluster Synthesis and Applications
Institute of Applied Physics
2012-2023
Russian Academy of Sciences
2014-2023
Saint Petersburg State Electrotechnical University
2014-2016
Moscow Aviation Institute
2014-2015
Colloidal particle lens array (CPLA) proved to be an efficient near-field focusing device for laser nanoprocessing of materials. Within CPLA, spherical particles do not act as independent microlenses. Due the coupling modes, field near clusters microparticles cannot calculated by means superposition Mie solutions individual spheres. In paper, electromagnetic distributions laser-irradiated dielectric microspheres with configurations that match fragments close-packed CPLA are studied. It is...
We consider nanopatterning of dielectric substrates by harmonics single powerful femtosecond pulses from a Ti:Sapphire laser. The is mediated closely packed monolayers polystyrene microspheres that act as microlenses at the surface. Observed modification material proceeds via ionization. By our theory, second harmonic more effective in multi-photon ionization and better focused than fundamental frequency which multiplying amount free electrons impact Experiments show conversion part pulse...
We consider laser nanostructuring of the material surface by means a colloidal particle lens array. Here, monolayer dielectric micro- or nanospheres placed on acts as an array near-field lenses that focus radiation into multitude distinct spots, allowing formation many structures in single stage. show conversion small part energy femtosecond beam second harmonic (SH) is efficient way to increase density obtained nanostructures. By combining fundamental frequency and SH, one benefits both...
This paper considers the surface nanostructuring of polymers and glasses by femtosecond laser pulses using an array colloidal particles as a focusing system. We demonstrate that partial conversion pulse energy into second harmonic considerably reduces modification threshold size resulting structural elements. At intensities above , (ablation swelling) occurs through free carrier generation. In this process, is more efficient in multiphoton ionisation, whereas fundamental impact ionisation....
A process of deep profiles formation on silicon carbide using ion-plasma etching in fluoride plasma is discussed. An industrial equipment «Caroline PE 15» (Russia) with ICP source was used experiments. The obtained experimental samples are perspective power electronics applications.
It is experimentally demonstrated that by converting a few percent of the fundamental frequency pulse energy into second harmonic one can obtain surface structures using dielectric microspheres with dimension order wavelength. Structuring means solely requires significantly greater density in than bichromatic irradiation. impossible to only radiation pulses, because at not focused system microspheres. Therefore, use pulses allows an essential increase structure recording density. Theoretical...
The results of investigations the microstructure and mechanical properties carbon fiber-reinforced plastic with fullerene soot used as nanodispersed filler are presented. Samples composites reinforcement scheme O2/9O4/O2, +452/−454/+452, O4, 904 were investigated. strength modulus elasticity unidirectional samples fillers fiber orientation ±45 improved by 5−20% after addition 0.2% filler. other arrangements do not change, or may reduce to some extent. It was found that nanomodification...
A methodology for determining residual stresses and strains in flat polymer composite panels reinforced by nanomodified whiskered fibers is suggested. In order to calculate the effective properties of monolayer, an approach based on model multilayered cylindrical inclusion used. The interfacial area are determined elliptical inclusions with chaotic orientation. a classical thermoelasticity layered composites. As example, we consider problem carbon fiber-reinforced plastic panel nanotubes...
Abstract The article discusses the conducted pilots in TNK-BP brown fields (Vaniegan, Samotlor) with non-intrusive surface ultrasonic sand monitors to optimize ESP lifted oil well regimes real time. Existing produced solids monitoring practices consist of regular sampling and require further filtration lab analysis. This process delays immediate corrective action implementation provides only sporadic values production. Excessive abrasive production has a strong negative impact on runlife...
The report presents the results of a study photo-cathodes based on phosphorus-doped nanocrystalline diamond films grown conductive silicon substrates using CVD method. quantum efficiency such cathodes was studied under action laser radiation with wavelength 266 nm and pulse duration 15 ns. It has been found that increases decrease in thickness film, reaching maximum at 100 nm. In this case, to be 2.4 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Two realizations of the time-resolved pump-probe method have been applied to study comparatively nonlinear optical response chalcogenide glasses system As-S-Se illuminated by femtosecond laser pulses near their fundamental absorption band edge and two-photon edge. In such conditions, charge carrier's photo-excitation is going on with participation gap states. By comparison results measurements numerical modeling, we demonstrated that character depends how a glass samples was illuminated. If...
Nonlinear optical response of glassy chalcogenide semiconductors has been studied under sub-gap illumination by using two realizations the pump-probe method with femtosecond resolution in time. The role exitons kinetics revealed.