A5068025643- Force Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Advanced Fluorescence Microscopy Techniques
- Liquid Crystal Research Advancements
- Near-Field Optical Microscopy
- Strong Light-Matter Interactions
- Gold and Silver Nanoparticles Synthesis and Applications
- Cancer therapeutics and mechanisms
- Photoreceptor and optogenetics research
- Advanced Biosensing Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Monoclonal and Polyclonal Antibodies Research
- Nonlinear Optical Materials Studies
- bioluminescence and chemiluminescence research
- Antibiotics Pharmacokinetics and Efficacy
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced biosensing and bioanalysis techniques
- Molecular Communication and Nanonetworks
- Chalcogenide Semiconductor Thin Films
- Integrated Circuits and Semiconductor Failure Analysis
- Thermal Radiation and Cooling Technologies
- Biotin and Related Studies
- Surface Roughness and Optical Measurements
Institute of Bioorganic Chemistry
2003-2024
Institute of Bioorganic Chemistry
2015-2024
Peoples' Friendship University of Russia
2024
National Research Nuclear University MEPhI
2012-2021
Université de Reims Champagne-Ardenne
2001-2020
Ikerbasque
2020
Moscow Institute of Physics and Technology
2020
Donostia International Physics Center
2020
Material Physics Center
2020
University of Southampton
2020
Novel types of electro- and photoactive quantum dot-doped cholesteric materials have been engineered. UV-irradiation or electric field application allows one to control the degree circular polarization intensity fluorescence emission by prepared liquid crystal films.
We present a route toward radical improvement in solar cell efficiency using resonant energy transfer and sensitization of semiconductor metal oxides with light-harvesting quantum dot (QD)/bacteriorhodopsin (bR) layer designed by protein engineering. The specific aims our approach are (1) controlled engineering highly ordered bR/QD complexes; (2) replacement the liquid electrolyte thin gold; (3) oriented deposition complexes on gold layer; (4) use Forster resonance coupling between bR QDs to...
Combination of 3D structural analysis with optical characterization the same sample area on nanoscale is a highly demanded approach in nanophotonics, materials science, and quality control nanomaterial. We have developed correlative microscopy technique where structure reconstructed by means "slice-and-view" combination ultramicrotomy scanning probe (scanning nanotomography, SPNT), its characteristics are analyzed using microspectroscopy. This has been used to determine direct quantitative...
We present a new concept of combined scanning probe microscope (SPM)/ultramicrotome apparatus. It enables “slice-and-view” nanotomography measurements and 3D reconstruction the bulk sample nanostructure from series SPM images after consecutive ultrathin sections. The is fixed on flat XYZ piezostage mounted ultramicrotome arm. measuring head with cantilever tip laser-photodiode detection system approaches for block-face surface immediately sectioning performed. moved along guides that are...
Resonant interaction between excitonic transitions of molecules and localized electromagnetic field allows the formation hybrid light-matter polaritonic states. This hybridization light matter states has been shown to significantly alter intrinsic properties molecular ensembles placed inside optical cavity. Here, we have observed strong coupling transition in a pair closely located organic dye demonstrating an efficient donor-to-acceptor resonance energy transfer with mode tuneable...
The work is devoted to the contactless control of surface topography and formation features by light irradiation in amorphousized liquid crystalline films azobenzene-containing polymethacrylates.
Abstract Novel glass-forming photoactive cholesteric mixtures doped with CdSe quantum dots were prepared and studied. The photooptical fluorescent properties of these materials possibility phototuning circularly polarised emission using ultraviolet irradiation was demonstrated. Keywords: oligomersquantum dotscircularly fluorescencephototuning Acknowledgements This research supported by the Russian Foundation Fundamental Research (11-03-01046, 09-03-12234-ofi-m) Program COST-D35.
The optical properties of CdSe/ZnS semiconductor nanocrystals with the core-shell structure are studied upon visible-laser excitation in a wide range flux densities. It is demonstrated that dimensional quantization effect preserved films limiting high concentration nanocrystals. A strong bathochromic shift absorption and luminescence peaks relative to peak positions corresponding spectra relatively low solutions caused by dipole moment related asymmetry nanoparticles. varied from 35 50 nm...
Abstract The synthetic function‐spacer‐lipid (FSL) amphiphile biotin‐CMG‐DOPE is widely used for delicate ligation of living cells with biotin residues under physiological conditions. Since this molecule has an “apolar‐polar‐hydrophobic” gemini structure, the supramolecular organization expected to differ significantly from classical micelle. Its investigated experimental methods and molecular dynamics simulations (MDS). Although linear length a single 9.5 nm, size dominant supramer globule...
Hybrid materials formed by semiconductor quantum dots and J-aggregates of cyanine dyes provide a unique combination enhanced absorption in inorganic constituents with large oscillator strength extremely narrow exciton bands the organic component. The optical properties dendrite structures fractal dimension 1.7–1.8, from integrated CdTe (QDs), have been investigated photoluminescence spectroscopy fluorescence lifetime imaging microscopy. Our results demonstrate that (i) are coupled to QDs...
Resonance interaction between a localized electromagnetic field and excited states in molecules paves the way to control fundamental properties of matter. In this study, we encapsulated organic with relatively low unoriented dipole moments polymer matrix, placed them tunable optical microcavity realized, for first time, controllable modification broad photoluminescence (PL) emission these strong coupling regime at room temperature. Notably, while most previous studies it was reported that...
Recently, photofluidization and mass-transfer effects have gained substantial interest because of their unique abilities photocontrolled manipulation with material structure physicochemical properties. In this work, the surface topographies amorphous, nematic, crystalline films an azobenzene-containing bent-core (banana-shaped) compound were studied using a special experimental setup combining polarizing optical microscopy atomic force microscopy. Spin-coating or rapid cooling samples...
Topotecan (TPT), a water-soluble derivative of camptothecin, is potent antitumor poison human DNA topoisomerase I (top1) that stabilizes the cleavage complex between enzyme and DNA. The role recently discovered TPT affinity to remains be defined. aim this work clarify molecular mechanisms TPT-DNA interaction propose models complexes in solution absence top1. It shown molecules form dimers with dimerization constant (4.0 +/- 0.7) x 10(3) M(-1) presence provokes more than 400-fold increase...
Abstract Using a novel experimental method combining of polarizing optical microscopy (POM) and atomic force (AFM), the surface topography properties chiral‐ photochromic LC systems were studied. For this purpose, mixture cholesteric cyclosiloxanes with azobenzene‐containing dopant was prepared. Correlations between features films POM images planarly oriented texture found. Polarized light action (532 nm) leads to formation partially aligned structure features. The observed photooptical...
Photonic crystals doped with fluorescent nanoparticles offer a plenty of interesting applications in photonics, laser physics, and biosensing. Understanding the mechanisms effects modulation photoluminescent properties photonic by varying depth nanoparticle penetration should promote targeted development nanocrystal-doped desired optical morphological properties. Here, we have investigated semiconductor quantum dots (QDs) into porous silicon performed experimental analysis theoretical...
Camptothecin (CPT) and its clinically important antitumor derivative topotecan (Tpt) were traditionally described as unique compounds exhibiting no affinity toward DNA alone or topoisomerase I (top1) but interacting with both the enzyme within so-called ternary cleavable complexes. We present here first experimental data on molecular structure geometry of Tpt−DNA complexes in solution. Tpt interacts minor groove demonstrates preferential binding to GC-rich DNA. The flow linear dichroism...
Light-matter interaction between a molecular ensemble and confined electromagnetic field is promising area of research, as it allows light-control the properties coupled matter. The common way to achieve coupling place an molecules or quantum emitters into cavity. In this approach, light-matter evidenced by modification spectral response emitter, which depends on strength emitter cavity modes. However, there not yet user-friendly approach that study large number different replaceable samples...
We explore the optical properties of plasmon localization and local field enhancement in metal-plastic metasurface. The flexible metal-dielectric metasurfaces are made from modulated polycarbonate substrate coated by a thin silver film. Localization an excitation is experimentally observed near-field scanning microscopy within subwavelength areas regular open-resonator localized modes seen as giant fluctuations electric spatially concentrated hotspots, where much larger than amplitude...
Laser-induced luminescence of multilayer structures based on the solids CdSe and CdSe/ZnS nanocrystals, different organic semiconductors layers with embedded nanocrystals has been investigated. Drastic decrease quantum yield is observed in films compared to those optical glasses. The matrices shown be suppressed. effects are explained by transfer photogenerated carriers from molecules semiconductors. presence charge confirmed a drastic increase conductivity (by 2 – 4 orders magnitude)...