A5039461929- Photonic and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Nanowire Synthesis and Applications
- Carbon Nanotubes in Composites
- Neuroscience and Neural Engineering
- GaN-based semiconductor devices and materials
- Semiconductor Lasers and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Semiconductor Quantum Structures and Devices
- Silicon Nanostructures and Photoluminescence
- Quantum Dots Synthesis And Properties
- Photonic Crystals and Applications
- Surface Treatment and Coatings
- Mechanical and Optical Resonators
- Graphene research and applications
- Iron oxide chemistry and applications
- Metal and Thin Film Mechanics
- Brake Systems and Friction Analysis
- Transition Metal Oxide Nanomaterials
- Plasma Diagnostics and Applications
- Material Properties and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- TiO2 Photocatalysis and Solar Cells
- Material Science and Thermodynamics
- Nanomaterials and Printing Technologies
Saint Petersburg Academic University
2019-2025
Peter the Great St. Petersburg Polytechnic University
2018-2024
St Petersburg University
2021-2022
National Research University Higher School of Economics
2022
University of Science and Technology Beijing
2022
Skolkovo Institute of Science and Technology
2022
St. Petersburg Institute for Informatics and Automation
2021
Fraunhofer Institute for Nondestructive Testing
2021
Silesian University of Technology
2021
Technical University of Sofia
2021
Abstract Emerging technologies for integrated optical circuits demand novel approaches and materials. This includes a search nanoscale waveguides that should satisfy criteria of high density, small cross‐section, technological feasibility structural perfection. All these are met with self‐assembled gallium phosphide (GaP) epitaxial nanowires. In this work, the effects nanowire geometry on their waveguiding properties studied both experimentally numerically. Cut‐off wavelength dependence...
Nanowires (NWs) of III-V semiconductors provide a promising platform for the development electronic and photonic components integrated circuits. For complex NW-based devices, it is crucial to precisely study structural, electronic, optical properties at nanoscale. Scanning tunneling microscopy (STM) commonly used achieve such precision. In this work we optimize contact parameters in an ultrahigh vacuum STM (at room temperature) reproducible high-quality topographic imaging conductive GaP...
Flexible and stretchable light-emitting devices are required for novel optoelectronic applications, including deformable screens microdisplays. In this paper, inorganic diodes (LEDs) exhibit elastic properties with both in-plane stretchable...
We propose a novel strategy to enhance optoelectrical properties of single-walled carbon nanotube (SWCNT) films for transparent electrode applications by film patterning. First, we theoretically considered the effect conducting pattern geometry on quality factor and then experimentally examined calculated structures. extend these results show that best characteristics patterned SWCNT can be achieved using combination initial properties: low transmittance high conductivity. The proposed...
We study the impact of improved heat removal on performance InGaAs/GaAs microdisk lasers epi-side down bonded onto a silicon substrate. Unlike initial characteristics microlasers GaAs substrate, former’s bonding results in decrease thermal resistance by factor 2.3 (1.8) microdisks with diameter 19 (31) µm, attributed to thinner layered structure between active region and substrate better conductivity Si than GaAs. Bonded show 2.4–3.4-fold higher maximum output power, up 21.7 mW, an...
Tailorable synthesis of axially heterostructured epitaxial nanowires (NWs) with a proper choice materials allows for the fabrication novel photonic devices, such as nanoemitter in resonant cavity. An example structure is GaP nanowire ternary GaPAs insertions form nano-sized discs studied this work. With use micro-photoluminescence technique and numerical calculations, we experimentally theoretically study photoluminescence emission individual NWs. Due to high refractive index near-zero...
The films of single-walled carbon nanotubes (SWCNTs) are a promising material for flexible transparent electrodes, which performance depends not only on the properties individual but also, foremost, bundling nanotubes. This work investigates impact densification optical and electronic SWCNT bundles fabricated films. Our ab initio analysis shows that optimally densified bundles, consisting mixture quasi-metallic semiconducting SWCNTs, demonstrate behavior can be considered as an effective...
In this paper, we report a method to estimate the average length of bundles in randomly oriented network single-walled carbon nanotubes (SWCNTs) by analyzing dependence its sheet resistance on distance between contacts. We propose an analytical model verify and find model's limitations using Monte Carlo simulations. Then, apply proposed approach experimental results acquired from 95% (at 550 nm wavelength) transparent SWCNT films. The bundle can be used situ does not require any specific...
Photo-induced current through nanocomposite heterojunction structures consisting of a TiO2 coating activated with embedded gold nanoparticles on top Si, SiO2, and columnar structured SiO2 is studied. The highest photo-activity in the visible part spectrum found composite containing pillar-like silicon dioxide nanostructures. Experimental results were qualitatively explained basis Franz-Keldysh effect taking into account effects electrical inhomogeneities appearing at charged nanoparticles....
Self-healing materials are an essential emerging class of smart materials, capable repairing their damage after external stimuli, especially mechanical damages. However, the lack studies on self-healing polymers electrical breakdown is highly important for engineering and electronics. We propose to use a nickel(II)-2,6-pyridinedicarboxamide-co-polydimethylsiloxane complex (NiPyPDMS) as protective material. To provide absence dust deposition from ambient air increase durability, we fabricated...
Effects promoted by a Ga optical nanoantenna on self-assembled GaP nanowires including field confinement, enhanced internal reflection and antenna effect are explored. The perspectives for nanophotonic emitters, waveguides couplers discussed.
We report on half-ring lasers that are 100–200 µm in diameter and fabricated by cleaving the initial full rings into halves. Characteristics of half-disk from same wafer compared. The active area microlasers is based quantum heterostructures mixed (0D/2D) dimensionality, referred to as well-dots with very high material gain. Half-ring show directional light emission single-mode lasing near threshold. A maximal continuous-wave output power 76 mW achieved for a 200 diameter. Half-rings...
We report on the fabrication and studies of Ø100 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> half-disk lasers with an active region based InGaAs/GaAs quantum dots providing very high modal gain. Such resonators support whispering gallery modes propagating at cavity periphery. The microlasers show directional light outcoupling: continuous-wave output power...
Abstract In this work, we study photo-induced current transfer through nanocomposite structures consisting of the TiO 2 coating activated with plasmonic gold nanoparticles on top pillar-like structured SiO . It is shown that photo-response can be adjusted via tuning heterostructure topology. Processes at interface between silicon and noble metal nanoparticle play an important role in charge carrier photo-generation. The high photo-activity visible part spectrum has been found composite,...
Abstract Epi-side down bonding on a silicon substrate of AlGaAs/GaAs microdisk lasers is presented. A heterostructure with coupled large optical cavities enables location an InGaAs quantum dot active region at distance ∼1 µ m from the surface. The thermal resistance was reduced to 0.2 and 0.1 K mW −1 for disks 30 50 in diameter, respectively. maximum continuous-wave power limited by rollover more than doubled after bonding.
Abstract Half-disk lasers fabricated by cleaving initial full-disk have an advantage of directional light outcoupling as well increased output power and efficiency compared to the same diameter. The continuous wave a 200 µ m diameter half-disk laser exceeds 70 mW. Quasi single-mode lasing with high side-mode suppression ratio more than 20 dB is demonstrated for various diameters. A maximum 3 small signal modulation frequency 4.9 GHz was measured 100 in laser.
Objective: To show the prospects of using public urban transport and, first all, high-capacity light rail rolling stock for transportation, and in immediate future, possibility completely abandoning private vehicles movement around city. As a result, this will help lessen traffic jam load Russian megacities. Methods: The authors have analyzed applied best practice leading tram companies Europe (Vienna, Prague, Riga, etc.), most progressive designs their undercarriage, compared foreign domestic...
This paper demonstrates an elastic (i.e., both flexible and stretchable) pixel matrix based on the patterned films of single-walled carbon nanotubes, which were obtained using optical lithography plasma etching. The proposed electrodes maintain their initial resistivity at 10% stretching. We also demonstrate application to array III–V semiconductor nanowires encapsulated into polymer matrix, paves way for highly deformable inorganic light-emitting or photodetector devices.