Andrei V. Veniaminov

Andrei V. Veniaminov
ITMO University | SPbNRU ITMO · International Research and Educational Center for Physics of Nanostructures

Doctor of Science (physics&math)

About

109
Publications
8,264
Reads
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756
Citations
Citations since 2017
40 Research Items
263 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
Andrei V. Veniaminov currently works at the Centre for Physics of Nanostructures, ITMO University.
Additional affiliations
September 1996 - December 2005
Johannes Gutenberg-Universität Mainz
March 1983 - December 2006
Education
September 1977 - February 1983
Leningrad State University
Field of study
  • physics

Publications

Publications (109)
Article
Full-text available
We present a review of information that has been published in the scientific literature on the mechanism of formation (development, enhancement) of holograms at the expense of the photochemical attachment of phenanthrenequinone molecules and other compounds to polymer chains and diffusion mixing of unreacted molecules, on different types of light-s...
Article
Full-text available
The principle of diffusion amplification of holograms on polymeric recording media is considered. It essentially consists of writing on a material two out-of-phase periodic structures (partially compensating each other), one of which is formed by a concentration distribution of chromophore groups combined into macromolecules, while the other is for...
Article
Applying forced Rayleigh scattering to monitor the drying behavior of poly(n-butyl-methacrylate-co-acrylic acid) dispersions (T > Tg + 5 K) via the diffusion of a hydrophobic dye, we find a characteristic length scale dependence of the tracer diffusion coefficient Dapp(Λ) (Λ) 0.17-10 µm), which allows one to quantitatively describe the transition f...
Article
Full-text available
Two-dimensional holographic structures based on photopolymer compositions with luminescent nanoparticles, such as quantum dots, are promising candidates for multiresponsive luminescence sensors. However, their applicability may suffer from the incompatibility of the components, and hence aggregation of the nanoparticles. We showed that the replacem...
Article
Full-text available
Magnetic-luminescent composites based on semiconductor quantum dots (QDs) and superparamagnetic iron oxide nanoparticles (SPIONs) can serve as a platform combining visualization and therapy. Here, we report the construction of QD-SPION nanocomposites based on synthesized SPIONs and alloyed QDs (CdxZn1−xSeyS1−y)/ZnS solubilized with L-cysteine molec...
Article
Full-text available
We report on the application of time-resolved inline digital holography in the study of the nonlinear optical properties of quantum dots deposited onto sample glass. The Fresnel diffraction patterns of the probe pulse due to noncollinear degenerate phase modulation induced by a femtosecond pump pulse were extracted from the set of inline digital ho...
Article
Novel composite material based on silica porous glass as low refractive index matrix and high refractive index As2S3 nanoparticles filled in the pores has been made. Chalcogenide nanoparticles were dissolved and the porous glass matrix was impregnated in the obtained solution. Subsequently, the solvent was evaporated by annealing the porous glass....
Preprint
Full-text available
We report on the application of time-resolved inline digital holography to study the nonlinear optical properties of quantum dots deposited onto the sample glass. Fresnel diffraction patterns of the probe pulse due to noncollinear degenerate phase modulation induced by the femtosecond pump pulse were extracted from the set of inline digital hologra...
Article
Full-text available
Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nanocomposites demonstrate more pronounced singlet ox...
Article
Full-text available
Titania nanoparticle/CdSe quantum dot hybrid structures are a promising bactericidal coating that exhibits a pronounced effect against light-sensitive bacteria. Here, we report the results of a comprehensive study of the photophysical properties and bactericidal functionality of these hybrid structures on various bacterial strains. We found that ou...
Article
A series of hybrid textures with variable topography and chemical composition were obtained on a hydrophilic steel (AISI 304) substrate with a hydrophobic MicroCoat® coating at the increasing incident nanosecond laser fluence from 1.4 J/cm² to 5.6 J/cm². The microtopography of the textured surface was studied by laser microscopy and scanning electr...
Preprint
Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nanocomposites demonstrate more pronounced singlet ox...
Article
Full-text available
The kinetics of photoluminescence of CuInS 2 /ZnS quantum dots at room temperature has been studied. We show that the parameters of the photoluminescence band of our quantum dots, i.e. its position and FWHM, do not depend on the delay time after the excitation laser pulse. These may suggest the spectral diffusion of photoluminescence of CuInS 2 /Zn...
Article
Highly doped (20 at.%) Yb³⁺:LiYF4 single-crystalline thin films are grown on (001)-oriented bulk undoped LiYF4 substrates by Liquid Phase Epitaxy using lithium fluoride (LiF) as a solvent. The growth temperature lies around 741 °C (0.5–1 °C supercooling) and the growth rate is 1.8-2.6 μm/min. The single-crystalline nature of the films is confirmed...
Article
We report on the first, to the best of our knowledge, in-band pumped T m 3 + , H o 3 + codoped waveguide (WG) laser. A depressed-index surface channel WG (type III) with a 50 µm half-ring cladding is fabricated in a 5 at. % T m 3 + , 0.5 at. % H o 3 + : K L u ( W O 4 ) 2 crystal by femtosecond pulse direct laser writing. Under in-band pumping by a...
Article
Surface channel waveguides (WGs) based on a half-ring (40-60-µm-diameter) depressed-index cladding (type III) geometry are fabricated in monoclinic Tm3+:MgWO4 by femtosecond (fs) laser writing at a repetition rate of 1 kHz. The WGs are characterized by confocal laser microscopy and μ-Raman spectroscopy. A Tm3+:MgWO4 WG laser generates 320 mW at ∼2....
Article
We report on the first active surface Y-branch waveguide in the ~2 μm spectral range. Depressed-cladding rectangular-cross-section surface waveguides with a splitting ratio of 1×2 are fabricated by femtosecond direct laser writing in a thulium (Tm $^{3+}$ ) doped monoclinic double tungstate crystal. Confocal laser microscopy and μ-Raman spectrosco...
Article
Full-text available
Photoelectrical and photoluminescent properties of multilayer graphene (MLG)–quantum dots (QD) hybrid structures have been studied. It has been shown that the average rate of transfer from QDs to the MLG can be estimated via photoinduced processes on the QDs’ surfaces. A monolayer of CdSe QDs can double the photoresponse amplitude of multilayer gra...
Article
Depressed-index buried and surface channel waveguides (type III) are produced in a bulk 3.5 at.% Tm3+:CALGO crystal by femtosecond direct-laser-writing at kHz repetition rate. The waveguides are characterized by confocal microscopy and µ-Raman spectroscopy. Under in-band-pumping at 1679 nm (3H6 → 3F4 transition) by a Raman fiber laser, the buried c...
Conference Paper
Depressed-index low-loss (0.38 dB/cm) buried channel waveguides with a circular cladding are fabricated in bulk Tm3+:SrF2 by ultrafast laser inscription. The waveguide laser generated 148 mW at 1.87 pm with a slope efficiency of 63.9%.
Article
We report on efficient laser operation of the first holmium monoclinic double tungstate waveguide laser fabricated by femtosecond direct laser writing. A depressed-index buried channel waveguide with a 60 μm diameter circular cladding was inscribed in 5 at.% Ho ³ :KGdWO 42 . It was characterized by confocal microscopy and μ-Raman and μ-luminescence...
Article
Full-text available
We report the generation of mid-infrared (~2 µm) high repetition rate (MHz) sub-100 ns pulses in buried thulium-doped monoclinic double tungstate crystalline waveguide lasers using two-dimensional saturable absorber materials, graphene and MoS 2 . The waveguide (propagation losses of ~1 dB/cm) was micro-fabricated by means of ultrafast femtosecond...
Article
Full-text available
Dodecanethiol-functionalized gold nanoparticles were incorporated into the polymer matrix of diurethane-methacrylate monomer mixture in the presence of SiO 2 nanoparticles (8 wt %) and a new reactive organic luminescent material ACAIN (1-N-(2-acryloyloxy-3-chloroprop-1-yl)-amino-5-isocyanonaphthalene, 1 wt %). This way, a new, probably multifunctio...
Article
We devote this article to the spectral analysis of volume holograms recorded in materials with diffusion-based formation mechanisms. Two media of different natures were examined: Polymer material with dye molecules photoattachable to macromolecules (PQ-PMMA) and photochromic additively colored fluorite crystal (CaF ² ). Differential spectra of holo...
Article
Full-text available
We report on the first erbium (Er3+) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er3+:KLu(WO4)2 crystal. A depressed-index buried channel waveguide formed by a 60 µm-diameter circular cladding was fabricated by 3D femtosecond direct laser writing. The waveguide was characterized by confocal laser microscopy,...
Article
Luminescent images of a few distinguishable alloyed semiconductor quantum dots obtained at room temperature using confocal scanning microscopy with spectral and temporal resolution demonstrate blinking of spatially distinguishable spots and local luminescence spectra varying within the ensemble.
Article
The effect of temperature on luminescence of semiconductor nanocrystals is used for monitoring local heating of specimens studied at laser scanning microscope. The spectral position of luminescence maximum is a convenient parameter to be followed; its thermal shift remains nearly linear within a broad temperature range. Nanoplatelets are found adva...
Article
Full-text available
Surface channel waveguides (WGs) were fabricated in a monoclinic Tm ³ :KLu WO 4 2 crystal by femtosecond direct laser writing (fs-DLW). The WGs consisted of a half-ring cladding with diameters of 50 and 60 μm located just beneath the crystal surface. They were characterized by confocal laser microscopy and μ-Raman spectroscopy, indicating a reduced...
Article
Full-text available
By means of the Forced Rayleigh Scattering (holographic grating relaxation) technique the diffusion of dye molecules in bulk films of polymer below entanglement molecular weight was investigated around the glass transition temperature. In the temperature range [Tg–20К; Tg+ 5К] a splitting of the dye diffusion coefficient into two separate branches...
Article
The absorption spectra and microscopic images of calcium precipitates in CaF2 crystals additively colored in a heat-pipe setup at various coloring regimes are studied. The effect of two main parameters of coloring procedure,calcium vapor pressure and temperature, is found to be different. Higher values of both parameters increase the number of anio...
Article
The values of the amplitudes of the refractive index and absorption coefficient modulations in volume hologram gratings, which were recorded in a polymer material with phenanthrenequinone (PQ), have been determined by the results of the approximation of the angular selectivity contours, which were measured at wavelengths of 450, 473, 532, and 633 n...
Article
Full-text available
Additively colored fluorite crystals are of considerable interest as a holographic recording medium. Due to very high stability as well as potentially large refractive index modulation, its possible to use holograms recorded in these crystals as high quality diffractive elements and photonic-crystalline structures. Therefore, it is important to be...
Chapter
Full-text available
The mechanisms of (i) forming the photochromic color centers in fluorite crystals (“additive coloring”) and (ii) recording and transforming holograms through the use of their photochromism are described. The diffusion-drift mechanism of hologram recording in additively colored fluorite crystals determines the recording kinetics and properties of ho...
Article
Full-text available
Nonlinear recording of stable fluorescent microstructures in PMMA films doped with photosensitive compound 2-(furan-2-yl)-3-(thiophen-2-carbonyl)-chromen-4-one is investigated. Energy and power density thresholds for recording stable fluorescent marks and for film destruction and photobleaching of the fluorescent marks by laser pulses were measured...
Article
Full-text available
Nanomechanical oscillators (NMO) on the base of amorphous C nanowhiskers, localized on the tops of W needles have been created and studied. Trajectories of resonant oscillations were visualized using a scanning electron microscope and a confocal laser scanning microscope. Resonant frequencies and the quality factor of NMO were determined at low pre...
Conference Paper
Full-text available
Light-sensitive polymer materials with embedded chromone dyes are promising candidates for multi-layer fluorescent disks for archival storage of information. The recording is based on two-photon-induced phototransformation and the signal readout is due to single-photon-induced luminescence. The stability of fluorescent chromone compounds upon reado...
Article
Full-text available
Dynamics of diffraction efficiency was monitored during recording a holographic grating in additively coloured CaF2 photochromic crystal at 180-200°C. Reciprocity failure revealed in the study was attributed to diffusion playing the crucial role in grating formation: recording at larger laser power goes faster but requires more energy. The efficien...
Article
The holographic grating relaxation technique also known as forced Rayleigh scattering consists basically in writing a holographic grating in the specimen of interest and monitoring its diffraction efficiency as a function of time, from which valuable information on mass or heat transfer and photoinduced transformations can be extracted. In a more d...
Article
Precise mass detectors based on an amorphous carbon nanowires, which localized on the top of a tungsten tip were fabricated and investigated. The nanowires were grown in the scanning electron microscope (SEM) chamber using focused electron beam technique. The movement trajectories and amplitude-frequency characteristics of the carbon nanowire oscil...
Conference Paper
Volume holographic gratings, both transmission and reflection-type, may be employed as one-dimensional pho- tonic crystals. More complex two- and three-dimensional holographic photonic-crystalline structures can be recorded using several properly organized beams. As compared to colloidal photonic crystals, their holographic counterparts let minimiz...
Article
Nanomechanical oscillators based on amorphous carbon whiskers, localized on the top of tungsten tip were fabricated and investigated. The whiskers were grown in the scanning electron microscope chamber using focused electron beam technique. Oscillation trajectories and amplitude-frequency characteristic of the oscillator were visualized at low and...
Conference Paper
Amplitude and phase contributions to mixed volume holographic gratings were extracted from measured contours of angular selectivity. Holograms for the investigation were recorded in the glassy polymer material with phenan-threnequinone (PQ) using the DPSS CW laser (532 nm) and then self-developed due to molecular diffusion of PQ, reaching diffracti...
Article
Full-text available
The structurization of holographic planes in holograms recorded in CaF2 crystal with color centers was found. The structurization is apparent in the formation of spiral bundles, which pierce the holographic planes. It testifies to self-organization of color centers in these planes. This process is believed to be linked with colloidal centers, 2D me...
Article
This paper presents the results of a study of methods of synthesizing erbium and ytterbium oxide nanoparticles, formed on the surface of silicon nanoparticles by low- and high-temperature methods of synthesis. The technology thus developed is based on a method for obtaining nanoparticles of the rare-earth elements by thermally decomposing their sal...
Conference Paper
Real-time holographic grating recording in an additively colored fluorite crystal at 180-200°C was monitored. After exposure, the diffraction efficiency was measured as a function of temperature, and significant departure of maximum diffraction was discovered.
Article
Full-text available
The structure of filter paper used as a porous matrix for incorporating quantum dots (QDs) has been investigated by means of a confocal microscope and an atomic-force microscope. The morphology of the QDs incorporated into its structure has been investigated, using PbS QDs 6.9 nm in diameter as examples. It is shown that the QDs are deposited onto...
Conference Paper
Full-text available
The study defines threshold values of energy density required for two-photon writing of stable fluorescent bit patterns within polymer layers containing chromones class chemical compounds by visual laser pulses in range of pulse widths from nanoseconds to femtoseconds. Photo-regrouping of non-luminescent chromones to fluorescent products is shown a...
Article
Full-text available
When holograms are recorded on color centers in calcium fluoride crystals, these centers undergo spatial redistribution in the crystal bulk, which is accompanied by their transformation. The nature of this transformation has been investigated by optical spectroscopy and confocal scanning microscopy. It is shown that, under the recording conditions...
Article
Full-text available
A hologram recorded in CaF2 crystal with color centers changes its nature (amplitude, phase, or amplitude-phase), profile, and diffraction efficiency under the impact of incoherent illumination and heating. The character of the amplitude-phase gratings in this crystal can be either in-phase or antiphase. These cases can be differentiated by analysi...
Article
Full-text available
Experimental results on visualization of type II fiber Bragg gratings induced in a birefringent fiber with an elliptical stress cladding are presented. The gratings are recorded by a single pulse of an excimer KrF-laser by means of the phase-mask method. Images of the gratings are obtained in a bright field using contrasting techniques such as diff...
Article
Full-text available
A hologram recorded in a CaF2 crystal by modulating the concentration of simple centers (F, M, R, and N) and highly aggregated (mainly colloidal) color centers has been exposed to incoherent 365 nm light to a dose of about 4000 J/cm2 at a temperature of 80°C. As a result of this exposure, the color centers were almost completely transformed into qu...
Article
Full-text available
The profile of an amplitude-phase volume holographic grating recorded in an additively colored calcium fluoride crystal is reconstructed from the spatial distribution of luminescence intensity in a thin layer of the grating with the use of a confocal scanning microscope. In agreement with the previously established mechanism of hologram recording i...
Article
Full-text available
This paper discusses the luminescence, the features, and the nonlinear conversion efficiency of optical radiation into the second harmonic as a function of the polarization direction of light in multilayer crystals of DAST [trans-4 -(dimethylamino)-N-methyl-4-stilbazolium tosylate], obtained by growth from a supersaturated solution in methanol. c 2...
Article
We present an analysis of methods for calibration of the spectral sensitivity of instruments in the near IR region of the spectrum (0.90–2.05μm), using as an example recording of the luminescence spectra of PbS semiconductor quantum dots using a diffraction monochromator and an InGaAs photodiode as the detector. We show that when high-sensitivity d...
Article
Full-text available
The features of the postexposure relaxation of holographic gratings recorded in inhomogeneous polyvinyl acetate latex films with photosensitive agents (photochromic molecules of fulgide dyes and phenanthrenequinone) have been considered. The diffusion coefficients and rms displacements of izomerized probe in polymer latex particles and aqueous envi...
Article
This paper describes the design features and technical parameters of a complex for characterizing the fluorescence parameters of macro- and microsamples in the near-IR region. Along with the standard 90 degrees setup for exciting and recording the fluorescence, a microfluorimetric technique is used. Two types of InGaAs photodiodes are compared, and...
Article
Organosilsesquioxane polymers doped with photochromic fulgide dye have been synthesized for use as model reversible holographic photosensitive media, combining high rigidity with the stability of the isomers of the photosensitive dye. The dye diffusion in the polymers, which affords the relaxation of the photo-induced holographic gratings with peri...
Article
Full-text available
This paper discusses the principle of the diffusion development of photoinduced holographic gratings with the use of photoattached molecules and its use in creating shrink-resistant photo-sensitive media for volume holography and in studying polymeric materials by a holographic relaxation method. It discusses how the composition, the fabrication me...
Article
Full-text available
The properties and characteristics of the holograms recorded on colloidal centers in calcium fluoride crystals have been considered. The amplitude-phase character of the holograms, with a dominance of the amplitude component, is demonstrated. It is shown that the effective thickness of the holograms is somewhat smaller than the sample thickness. Th...
Article
This article reports the application of the Photo-Induced Grating Relaxation technique (also known as Forced Rayleigh Scattering) to investigate the dynamics of films prepared from structured core–shell latex particles via the transport property of the photochromic tracer molecule Aberchrome 540®. The core–shell particles were prepared with a fluor...
Article
Full-text available
It is shown by experimental examples how the postexposure relaxation of a photochemically induced grating used to study the diffusion of a molecular probe by the holographic relaxation method depends on the molecular mechanism of the grating formation, medium inhomogeneity, and relative shift of grating parts, as well as the grating strength. The a...
Article
Full-text available
The specific features of the postexposure evolution of photoinduced (holographic) gratings in a model medium that consists of poly(methyl methacrylate) with distributed phenanthrenequinone and is characterized by a diffusion enhancement are investigated using the holographic relaxation technique. It is established that the evolution process occurs...
Article
Full-text available
The diffusion of a photochromic dye tracer in polycarbonate was studied by a holographic relaxation technique (forced Rayleigh scattering) at temperatures close to the glass transition temperature. By varying the holographic grating period the results could be interpreted via the spatial scale dependence of apparent diffusion coefficients within a...