A5076251121- Quantum Dots Synthesis And Properties
- Crystallization and Solubility Studies
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- X-ray Diffraction in Crystallography
- Photonic Crystals and Applications
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Carbon and Quantum Dots Applications
- Thermal and Kinetic Analysis
- Energetic Materials and Combustion
- Chemical Thermodynamics and Molecular Structure
- Laser Material Processing Techniques
- nanoparticles nucleation surface interactions
- Nonlinear Optical Materials Studies
- Nanocluster Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Spectroscopy and Quantum Chemical Studies
- Silicon Nanostructures and Photoluminescence
- Photonic Crystal and Fiber Optics
- Nuclear reactor physics and engineering
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Fiber Optic Sensors
- Graphite, nuclear technology, radiation studies
- Luminescence Properties of Advanced Materials
ITMO University
2014-2024
Belgorod National Research University
2024
Joint Institute for High Temperatures
2023-2024
St Petersburg University
1995-2022
All-Russian Scientific Research Institute of Technical Physics
2021-2022
Institute of Problems of Chemical Physics
2016-2020
Sorbonne Université
2016
Laboratoire de Météorologie Dynamique
2016
Observatoire de Paris
2016
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2016
The applicability of two frequently used interaction potentials for water, the five-site ST2 model and four-site TIP4P model, is investigated in computer simulations water droplets varying cluster size from N=64 to N=512. orientation molecules surface region both models. Surface properties, such as work formation, local density profiles, kinetic total energy pressure profiles a function droplet size, obtained using models are compared. Moreover, potential electric calculated. tension...
Yb 3+ -CsPbCl x Br 3− perovskite nanocrystals with a high two-photon absorption cross-section of 2.3 × 10 5 GM embedded into amphiphilic silica microspheres emit visible and near-infrared light under infrared excitation in toluene water.
Mg–air batteries have high theoretical energy density and cell voltage. Their use of environmentally friendly salt electrolyte commercially available magnesium materials determines their acceptable technical economic efficiency, safety, ease operation. However, the practical applicationsof arevery limited due to polarization anodes batteries’ low Faraday efficiency. In this study, we considered possibility designingan battery withincreased power by adapting engineering solutions developed...
Surface channel waveguides (WGs) were fabricated in a monoclinic Tm 3 :KLuWO 4 2 crystal by femtosecond direct laser writing (fs-DLW).The WGs consisted of half-ring cladding with diameters 50 and 60 μm located just beneath the surface.They characterized confocal microscopy μ-Raman spectroscopy, indicating reduced crystallinity stress-induced birefringence WG cladding.In continuous-wave (CW) mode, under Ti:sapphire pumping at 802 nm, maximum output power reached 171.1 mW 1847.4 corresponding...
We report on efficient laser operation of the first holmium monoclinic double tungstate waveguide fabricated by femtosecond direct writing. A depressed-index buried channel with a 60 μm diameter circular cladding was inscribed in 5 at.% Ho3+:KGd(WO4)2. It characterized confocal microscopy and μ-Raman μ-luminescence spectroscopy, indicating well-preserved crystallinity its core. Pumped thulium bulk laser, generated 212 mW at 2055 nm slope efficiency 67.2%. The propagation losses were 0.94±0.2 dB/cm.
We report the generation of mid-infrared (~2 µm) high repetition rate (MHz) sub-100 ns pulses in buried thulium-doped monoclinic double tungstate crystalline waveguide lasers using two-dimensional saturable absorber materials, graphene and MoS2. The (propagation losses ~1 dB/cm) was micro-fabricated by means ultrafast femtosecond laser writing. In continuous-wave regime, generated 247 mW at 1849.6 nm with a slope efficiency 48.7%. operated fundamental transverse mode linearly polarized...
Clusters containing 64 molecules of water or bromine were investigated by the molecular dynamics method. Several models and a model taken into consideration in order to test modern theory surface potential polar liquid find out dipole quadrupole contribution this potential. The results simulations confirm strongly theoretical conclusion that equally with there is purely quadrupolar
Abstract Stuctural transformations of 1,1‐diamino‐2,2‐dinitroethene (FOX‐7) were investigated in the temperature range 298–513 K by means DSC, TG, isothermal calorimetry, PXRD, IR spectroscopy, and electron microscopy. The data obtained confirm existence high‐temperature δ‐FOX‐7 polymorph stable above 480 K. heat effect γ→δ transformation is − 4.6 J g −1 (−680 mol ). Metastable γ‐phase formed reverse process δ→γ has a perfect crystal structure towards thermal decomposition. Possible...
Radial local densities, energies per molecule, orientational distribution functions, normal component of the pressure tensor and other surface properties water are calculated, based on molecular dynamics simulations clusters at 300 K. Three different models evaluated: rigid five-site ST2 four-site TIP4P models; three-site SPC/E model, which is made flexible with respect to angle bending. The size varied from 64 1000 molecules. It concluded that highly sensitive choice potential model. On...
A hologram recorded in CaF2 crystal with color centers changes its nature (amplitude, phase, or amplitude-phase), profile, and diffraction efficiency under the impact of incoherent illumination heating. The character amplitude-phase gratings this can be either in-phase antiphase. These cases differentiated by analysis angular dependencies responses. Owing to diffusion-drift mechanism recording, tough photo-thermal treatment does not result noticeable decay. Incoherent enables formation...
The optical properties of three-dimensional ordered superstructures formed on glass substrates by self-assembly cadmium selenide or lead sulfide nanocrystals (NCs) are investigated and compared to the initial NC colloidal solutions. formation is strongly correlated presence oleic acid molecules surface NCs. It found that absorption band NCs in broadened shifted shorter wavelengths comparison with solution. luminescence spectra also differ from observed modification a manifestation...
We report on the first, to best of our knowledge, in-band pumped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi mathvariant="normal">T</mml:mi> mathvariant="normal">m</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>,</mml:mo> mathvariant="normal">H</mml:mi> mathvariant="normal">o</mml:mi> </mml:math> codoped waveguide (WG) laser. A depressed-index surface channel WG (type III)...
Multifunctional nanocomposites that combine both magnetic and photoluminescent (PL) properties provide significant advantages for nanomedical applications. In this work, a one-stage synthesis of magneto-luminescent (MLNC) with subsequent stabilization is proposed. Microwave carbon dots (M-CDs) was carried out using precursors nanoparticles. The effect on the morphological optical has been evaluated. Both types demonstrate PL simultaneously. resulting MLNCs demonstrated excellent solubility...
Abstract Carbon dots (CDs) are promising nanostructures in the field of photonics owing to ease fabrication, tunable and efficient emission. Gallium phosphide (GaP) nanowires known for high surface area, optical density, waveguiding, resonant properties but lacking luminescence due indirect bandgap. Here, hybrid photonic structures – GaP decorated with CDs fabricated studied. Feasible drop‐casting deposition technique allows fabrication dense vertical exhibiting photoluminescence. Deposition...
Methanol clusters have been studied based on Molecular Dynamics simulations. The methanols are described using the three-site OPLS potential model by Jorgensen. Five separate with sizes up to 512 molecules treated at two different temperatures, 200 K and 300 K, respectively. Several properties, for example, local density, electric normal pressure, calculated. Also, surface of methanol is computed, radial profiles potential. It shown, once again, that quadrupolar contribution important total...
We report on the first erbium (Er3+) doped double tungstate waveguide laser. As a gain material, we studied monoclinic Er3+:KLu(WO4)2 crystal. A depressed-index buried channel formed by 60 µm-diameter circular cladding was fabricated 3D femtosecond direct laser writing. The characterized confocal microscopy, µ-Raman and µ-luminescence mapping, confirming that crystallinity of core is preserved. laser, diode pumped at 981 nm, generated 8.9 mW 1533.6 nm with slope efficiency 20.9% in...
Ternary hybrid photovoltaics based on polymers, fullerenes, and colloidal semiconductor quantum dots (QDs) bring together high efficiency technological flexibility. To increase the performance of such solar cells, a thorough control over both film morphology charge transport is required. In present work, optical properties films binary ternary blends PbS QDs with poly(3-hexylthiophene-2,5diyl) [6,6]-phenyl C71 butyric acid methyl ester have been investigated by steady-state time-resolved...
We report on the first active surface Y-branch waveguide in ~2 μm spectral range. Depressed-cladding rectangular-cross-section waveguides with a splitting ratio of 1 × 2 are fabricated by femtosecond direct laser writing thulium (Tm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> ) doped monoclinic double tungstate crystal. Confocal microscopy and μ-Raman spectroscopy reveal well preserved crystallinity core. Under high-brightness...