A5091009335- Silicon Nanostructures and Photoluminescence
- Laser Material Processing Techniques
- Laser-Ablation Synthesis of Nanoparticles
- Nonlinear Optical Materials Studies
- Nanowire Synthesis and Applications
- Thin-Film Transistor Technologies
- Phase-change materials and chalcogenides
- Photonic Crystals and Applications
- Diamond and Carbon-based Materials Research
- Ocular and Laser Science Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Ion-surface interactions and analysis
- Photonic and Optical Devices
- Carbon Nanotubes in Composites
- Nanoplatforms for cancer theranostics
- Photoacoustic and Ultrasonic Imaging
- Laser-induced spectroscopy and plasma
- Chalcogenide Semiconductor Thin Films
- Liquid Crystal Research Advancements
- Glass properties and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Photodynamic Therapy Research Studies
- Optical Imaging and Spectroscopy Techniques
- Advanced Semiconductor Detectors and Materials
Lomonosov Moscow State University
2015-2024
Moscow State University
2007-2024
Kurchatov Institute
2008-2020
Institute of Physics and Technology
2018-2020
Moscow Institute of Physics and Technology
2016-2020
Hybrid nanoparticles (NPs) with complex morphology, structure, and chemical composition are considered key building blocks of next-generation optoelectronic devices, catalysts, sensitizers/agents for diverse biomedical applications. Laser ablation in liquid (LAL) has emerged as a promising route to design produce unique nanocomposite NPs, yet control over the product's size structure is limited by tuning laser parameters or content surrounding liquid. In this paper, based on example porous...
Modern trends in optical bioimaging require novel nanoproducts combining high image contrast with efficient treatment capabilities. Silicon nanoparticles are a wide class of nanoobjects tunable properties, which has potential as contrasting agents for fluorescence imaging and coherence tomography. In this paper we report on developing technique fabricating silicon by means picosecond laser ablation porous films nanowire arrays water ethanol. Structural properties these particles were studied...
Due to their biocompatibility silicon nanoparticles have high potential in biomedical applications, especially optical diagnostics. In this paper we analyze properties of the formed via laser ablation water and study possibility application as contrasting agents coherence tomography (OCT). The suspension was produced by picosecond irradiation monocrystalline wafers water. According transmission electron microcopy analysis obtained vary size from 2 200 nm while concentration particles is...
Ge2Sb2Te5 based devices attract the attention of researchers due to wide opportunities in designing phase change memory. Herein, we studied a possibility fabricate periodic micro- and nanorelief at surfaces thin films on silicon oxide/silicon substrates under multi-pulse femtosecond laser irradiation with wavelength 1250 nm. One-dimensional lattices periods ± 90 130 30 nm were obtained depending number acted pulses. Emergence these structures can be explained by plasmon-polariton generation...
Biodegradable and low-toxic silicon nanoparticles (SiNPs) have potential in different biomedical applications. Previous experimental studies revealed the efficiency of some types SiNPs tumor hyperthermia. To analyse feasibility employing produced by laser ablation nanowire arrays water ethanol as agents for hyperthermia, we numerically simulated effects heating a millimeter-size nodal basal-cell carcinoma with embedded continuous-wave radiation at 633 nm. Based on scanning electron...
The method for the formation of silicon nanoparticles by picosecond laser pulses is studied upon surface irradiation single-crystal in various liquids. ablation products are investigated using atomic-force microscopy and Raman spectroscopy. experimental results indicate crystal-line structure dependence their size on medium.
The efficiency of light scattering by nanoparticles formed using the method picosecond laser ablation silicon in water and mechanically grinded mesoporous is compared. ensembles particles both types possess coefficients sufficient to use them as contrast agents optical coherence tomography (OCT), particularly range wavelengths 700 – 1000 nm, where absorption most biological mimicking tissues small. According Mie theory main contribution this case made having a relatively large size (150 300...
A one-dimensional surface relief with a 1.20 ± 0.02 µm period was formed in amorphous hydrogenated silicon films as result of irradiation by femtosecond laser pulses (1.25 µm) fluence 0.15 J cm−2. Orientation the structures determined polarization vector radiation and number acting pulses. Nanocrystalline phases volume fractions from 40 to 67% were detected irradiated according analysis Raman spectra. Observed micro- nanostructuring processes caused plasmon–polariton excitation near-surface...
One-dimensional periodic surface structures were formed by femtosecond laser irradiation of amorphous hydrogenated silicon (a-Si:H) films. The a-Si:H processing conditions influence on the relief formation as well correlation irradiated surfaces structural properties with their electrophysical investigated. period 0.88 and 1.12 μm fabricated at wavelength 1.25 pulse number 30 750, respectively. orientation structure is defined polarization depends concentration nonequilibrium carriers...
Chalcogenide vitreous semiconductors (ChVSs) find application in rewritable optical memory storage and optically switchable infrared photonic devices due to the possibility of fast reversible phase transitions, as well high refractive index transmission near- mid-infrared spectral range. Formed on such materials, laser-induced periodic surface structures (LIPSSs), open wide prospects for increasing information capacity create polarization-sensitive elements photonics. In present work, a...
Abstract The possibility of manufacturing silicon nanoparticles by picosecond laser fragmentation microparticles in water is analysed. It shown that for duration 40 min, the dependence average sizes particles on initial mass concentration micropowder varied range 0.5 – 12 mg mL −1 nonmonotonic, with maximum size 165 nm being achieved at a 5 . To explain obtained result, simulation propagation focused beam scattering suspension performed their different concentrations. demonstrated...
The self-action of light in birefringent mesoporous silicon films is studied using picosecond laser pulses. Two mechanisms are found. One them manifests itself at intensities below 3 MW cm-2 and tends to saturation. other dominates above 10 cm-2. former related the resonant excitation electronic states on surface nanocrystals, whereas latter due local fields nanocomposite. For aforementioned ranges intensity, cubic nonlinear susceptibility exceeds that single-crystal by six four orders...
Abstract The paper discusses the possibility of manufacturing silicon nanoparticles, which are suitable for contrasting biological tissues imaged by optical coherence tomography, femtosecond laser ablation porous in various liquids. manufactured nanoparticles characterised average sizes 87, 112, and 102 nm cases water, ethanol, liquid nitrogen, respectively, as well a relatively narrow size distribution, provides additional advantages subsequent delivery into tissues. Electrochemical...
Ge2Sb2Te5 (GST225) looks to be a promising material for rewritable memory devices due its relatively easy processing and high optical electrophysical contrast the crystalline amorphous phases. In present work, we combined possibilities of crystallization anisotropic structures fabrication using femtosecond laser treatment at 1250 nm wavelength 200 thin GST225 films on silicon oxide/silicon substrates. A raster mode photoexcited surface plasmon polariton generation allowed us produce mutually...
In experiments on nonlinear-optical transmission of picosecond laser pulses at the wavelength 1.064 μm three-order-of-magnitude enhancement photoinduced absorption in optically anisotropic mesoporous silicon films compared to crystalline (c-Si) was found. The effect is not sensitive polarization radiation and it saturates peak intensities about 5 MW/cm2. Higher intensity results polarization-sensitive absorption, which merely one-order-of-magnitude more effective than c-Si. These efficient...