A5039348589- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Carbon Nanotubes in Composites
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Solid State Laser Technologies
- Fiber-reinforced polymer composites
- Solid-state spectroscopy and crystallography
- Semiconductor materials and devices
- Advanced Photonic Communication Systems
- Material Properties and Applications
- Silicone and Siloxane Chemistry
- Photonic Crystals and Applications
- Ferroelectric and Piezoelectric Materials
- Luminescence Properties of Advanced Materials
- Gyrotron and Vacuum Electronics Research
- Acoustic Wave Resonator Technologies
- Fullerene Chemistry and Applications
- Synthesis and properties of polymers
- Electromagnetic Fields and Biological Effects
- Semiconductor Lasers and Optical Devices
- Optical and Acousto-Optic Technologies
- Laser-Ablation Synthesis of Nanoparticles
- Geophysics and Sensor Technology
Perm State University
2016-2025
Institute of Physics
2025
North-Western State Medical University named after I.I. Mechnikov
2021
Lithium niobate (LN) is one of the key materials in modern instrument engineering. Currently, photonic devices based on thin films have great potential for use. That why role surfaces technological operations strongly increases. Herein, powerful effect modifying surface LN oxygen plasma at low pressures diffusion coefficient hydrogen ions demonstrated. Plasma activation leads to changes chemical composition, found by X‐Ray photoelectron spectroscopy (XPS), Raman, and IR methods that part...
Herein, the results of studying reflection stripe domains growing during polarization reversal in congruent lithium niobate single crystals modified by soft proton exchange are presented. The situ optical imaging reveals with growth directions along three equivalent Y crystallographic axes. When domain approaches standing one, its direction changes 120° to another axis. A strong difference on opposite polar surfaces is revealed: at Z + surface it occurs lower distances through two successive...
The material with the fluorination level of <italic>x</italic> = 0.98 reaches specific capacity 850 mA h g<sup>−1</sup>, <italic>i.e.</italic>, its theoretical value.
This paper reviews the features of structure, composition and mechanical properties subsurface layer pure lithium niobate. Depth this ranges up to 20 μm, it's structure vary significantly from bulk a material. It is shown that said differ material as well, mainly due polishing, which increases density defects, namely dislocations. High dislocation leads drift various parameters in optical modulators, making results their work inconsistent. These are important production devices created on basis
Density of dislocations in the near-surface layer was investigated X-cut LiNbO3 depending on thermal annealing temperature range 400°C–600°C. A dynamic model randomly distributed has been developed for by using X-ray diffraction. The experimental results showed that dislocation density reached minimum at 500°C, with analysis being performed when wet selective etching and diffraction methods were used. We concluded homogenization is an effective technique to improve quality photonic circuits...
This study involves the results of research on short-term and long-term DC-drifts in electro-optical modulators based annealed proton exchange waveguides LiNbO3 crystals after wafer pre-annealing. The relaxation time DC-drift operating point for a drift is measured minutes, it hours days. was by applying bias voltage changing crystal temperature. obtained show significant impact stability EO-modulators treatment defective structure near-surface layer crystal. Treatment disturbed simultaneous...
ABSTRACTSamples cleaning in ammonia-peroxide solution (APS) leads to increase of waveguides contrast after proton exchange comparing with the without APS cleaning. Surface and sublayer lithium niobate was studied by optical microscopy, scanning electron microscopy X-ray diffraction. It detected many multidirectional scratches on surface defective till a depth 6 μm. These facts are important for manufacture integrated circuits: repeatability, waveguide loss circuit drift parameters.
Differential scanning calorimetry was used to study the Co-C nanocomposite, which is an array of ultrathin carbon nanocages encapsulated cobalt nanoparticles. The activation energy α-&gt; β transformation nanocomposite and value its endothermic effect have been estimated. Thermal much greater than those values that correspond observation conditions for α-&gt;β transformations in massive samples. idea put forward transitional assumed by a non-diffusion, mechanism. Keywords: phase...
The formation of periodically polarized waveguide structures in lithium niobate crystals for nonlinear optical transformations laser radiation the telecommunications wavelength range is an important applied problem. One options forming waveguides with low switching fields can be obtained by soft proton exchange. In this work, using X-ray diffraction analysis, it shown that anomalously polarization thresholds occur layers so-called intermediate κ-phases when varying time exchange, and...