A5064244702- Phase-change materials and chalcogenides
- Glass properties and applications
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Optical Network Technologies
- Crystal Structures and Properties
- Luminescence Properties of Advanced Materials
- Photonic Crystal and Fiber Optics
- Laser-Ablation Synthesis of Nanoparticles
- Photonic and Optical Devices
- Copper-based nanomaterials and applications
- Photorefractive and Nonlinear Optics
- Nonlinear Optical Materials Studies
- Nonlinear Optical Materials Research
- Material Dynamics and Properties
- Energetic Materials and Combustion
- Ionic liquids properties and applications
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Material Science and Thermodynamics
- Inorganic and Organometallic Chemistry
- Catalysis and Oxidation Reactions
- Thin-Film Transistor Technologies
- Advanced Photonic Communication Systems
St Petersburg University
2016-2025
St. Petersburg State Technological Institute
2014
Pushkin Leningrad State University
1991
We explore the use of a highly nonlinear chalcogenide-silica waveguide for supercontinuum generation in near infrared. The structure was fabricated by pressure-assisted melt-filling silica capillary fiber (1.6 µm bore diameter) with Ga4Ge21Sb10S65 glass. It designed to have zero group velocity dispersion (for HE11 core mode) at 1550 nm. Pumping 1 cm length 60 fs pulses from an erbium-doped laser results octave-spanning light pulse energies only pJ. Good agreement is obtained between...
We report a hybrid chalcogenide-silica photonic crystal fiber made by pressure-assisted melt-filling of molten glass. Photonic bandgap guidance is obtained at silica core placed centrally in hexagonal array continuous centimeters-long chalcogenide strands with diameters 1.45 μm. In the passbands cladding, when transmission through very weak, light up distinct modal patterns corresponding to Mie resonances. spectral regions between these passbands, strong observed, where loss 60 dB/cm lower....
Antimony sesquiselenide has become an outstanding functional material for photovoltaics, energy storage and transformation, memory photonic applications. Sb2Se3 is one of the most successful emerging solar light absorbers also been identified as a highly promising ultralow-loss phase-change (PCM) next-generation coherent nanophotonic processors, tensor cores, quantum neuromorphic networks. Unlike benchmark telluride PCMs, features quasi-one-dimensional (1D) crystalline structure consisting...
Abstract For the first time, Raman spectra of bulk Se x Te 1‐ glasses, 0.5 ≤ 1.0, have been measured over entire glass‐forming range. The exhibit three broad spectral features between 150 and 300 cm −1 , attributed to Te–Te, Se–Te, Se–Se stretching modes according DFT simulations. observed weak chemical ordering in glasses is discussed on basis heteropolar homopolar bond fractions derived from integrated intensity cross‐sections. underlying structural model suggests a random distribution...
High optical and electric contrast between the SET (crystalline) RESET (amorphous) logic states is related to different short intermediate range order in orthorhombic vitreous Sb 2 S 3 .
Vitreous germanium disulfide GeS2 and diselenide GeSe2 belong to canonical chalcogenide glasses extensively studied over the past half century. Their high-temperature orthorhombic polymorphs are congruently melting compounds, tetrahedral crystal glass structure is largely preserved in melt. In contrast, ditelluride counterpart absent Ge–Te phase diagram, which shows only a single compound, monotelluride GeTe. Phase-change materials based on GeTe have become technologically important class of...
Oxidative recycling of metals is crucial for a circular economy, encompassing the preservation natural resources, reduction energy consumption, and mitigation environmental impacts greenhouse gas emissions associated with traditional mining processing. Low-melting gallium trichloride appears to be promising oxidative solvent rare-earth metals, transuranium elements, platinum, pnictogens, chalcogens. Typically, dissolution GaCl3 occurs at relatively low temperatures over few days, assuming...
Binary Ge–Te and ternary Ge–Sb–Te systems belong to flagship phase-change materials (PCMs) are used in nonvolatile memory applications neuromorphic computing. The working temperatures of these PCMs limited by low-T glass transition crystallization phenomena. Promising high-T may include gallium tellurides; however, the atomic structure transformation processes for amorphous Ga–Te binaries simply missing. Using high-energy X-ray diffraction Raman spectroscopy supported first-principles...
A small difference in energy between homopolar and heteropolar bonds the glass-forming ability of pure chalcogens leads to unexpected trends densification mechanisms glassy chalcogenides compared vitreous oxides. Using high-precision compressibility measurements situ high-energy X-ray diffraction up 14.7 GPa, we show a new route canonical glass As2S3. After first reversible elastic step with maximum pressure 1.3 characterized by strong reduction voids cavities, significant bonding or...
An unusually rigid glassy GaS film obtained by PLD shows an excellent light-induced damage threshold promising for memory applications.
We proposed a new concept of increasing the plasticity chalcogenide glasses while maintaining high glass transition temperature. The main idea this lies in formation Ag–Ag metallophilic interactions when silver is introduced into composition. This suggestion was confirmed by experimental study based on Ag2Se–Sb2Se3–GeSe2 system. It observed that introduction 40 mole percent Ag2Se composition leads to increase its 3.5 times, whereas temperature such remains higher than 200 °C. most typical...
Abstract The ability to predict the influence of dopants (such as antimony) on short‐range structure As‐S‐I glasses has potential help design with modified properties. In present work, As‐Sb‐S‐I been investigated along As SI ‐Sb section fixed sulfur and iodine concentrations equivalent arsenic by antimony substitution. At high content (As:Sb≥2:1) substitutes in AsI 3 molecules justified Raman spectroscopy XPS . Further introduction (As:Sb<2:1) leads substitution ‐S‐As‐S‐ polymeric chains,...
Emerging brain-inspired computing needs phase-change materials of the next generation with lower energy consumption and wider temperature range. Gallium tellurides appear to be promising candidates enable achieve necessary requirements.
The phenomenon of phase change transition has been a fascinating research subject over decades due to possibility dynamically controlled materials properties, allowing the creation optical devices with unique features. present paper unravels characteristics and terahertz (THz) dielectric permittivity novel material (PCM), GeTe2, prepared by pulsed laser deposition (PLD) their remarkable contrast in crystalline amorphous states, particular, difference 7 orders magnitude conductivity. THz...
Nonlinear optical (NLO) crystals are widely used in advanced photonic technologies for second harmonic and difference frequency generation (SHG DFG, respectively), producing coherent light at frequencies where existing lasers unavailable. Isotropic glasses do not exhibit SHG or except temporarily induced anisotropy under external stimuli. However, recent reports on with chiral structural motifs show promising permanent NLO properties. We propose an alternative solution: hybrid...
Brain‐inspired computing, reconfigurable optical metamaterials, photonic tensor cores, and many other advanced applications require next‐generation phase‐change materials (PCMs) with better energy efficiency a wider thermal spectral range for reliable operations. Germanium ditelluride (GeTe 2 ), higher stability larger bandgap compared to current benchmark PCMs, appears promising THz metasurfaces the controlled crystallization of atomically thin 2D materials. Using high‐energy X‐Ray...