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Sergey Kudryashov

Sergey Kudryashov
Lededev Physical Institute · Quantum radiophysics

Professor

About

449
Publications
47,350
Reads
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4,483
Citations
Additional affiliations
May 2015 - present
ITMO University
Position
  • Leading Scientist
May 2014 - present
National Research Nuclear University MEPhI
Position
  • Professor (Associate)
October 2006 - present
Lebedev Phyiscal Institute, Russian Academy of Sciences
Position
  • Seniour researcher

Publications

Publications (449)
Article
Thin nanostructured metal (Au, Ag) films, magnetron-sputtered on semiconductor (n-type Si) substrate under 6 V voltage exposure for 15 min, exhibit high antibacterial effect against the food pathogens S. aureus and P. aeruginosa . Nanostructures were formed by femtosecond laser ablation, resulting in an array of microspots. The observed effect is c...
Article
Optical transmission/absorption measurements in diamond provide a way for determining content of basic nitrogen defects, with their concentrations varying in different crystals by many orders of magnitude. In a traditional scheme of transmission measurement in many diamond crystals only a small fraction of incident light is transmitted and detected...
Article
Colloidal solutions of silver nanoparticles (NPs) were obtained by ultrashort-pulse laser ablation of silver films of variable thickness in water at different fluences, pulse durations and laser exposures. Characterization of these particles was performed by scanning electron microscopy, optical transmission spectroscopy, and dynamic light scatteri...
Article
Microscale filamentation of 0.25 NA-focused, linearly and circularly polarized 1030 nm and 515 nm ultrashort laser pulses of variable pulse widths in fused silica, fluorite, and natural and synthetic diamonds demonstrates the Raman-Kerr effect in the form of critical pulse power magnitudes, proportional to squared wavelength and inversely proportio...
Article
Ultrashort (femto-picosecond) laser pulses with supercritical peak pulse powers undergo self-focusing and multiple filamentation during their propagation in transparent media. In this work, a comparative study of propagation and position-dependent ablation of a gold target in water by 0.3 ps and 10 ps 1030 nm laser pulses was performed. The filamen...
Article
A development of a method for measuring the refractive index of optical media based on the transport-of-intensity equation (TIE) is proposed. The method requires only a complementary metal-oxide semiconductor (CMOS) camera, which registers intensity distributions in several planes. The obtained intensity distributions are used to solve the TIE, kno...
Article
The formation of alloyed Au/Pd nanoparticles (NPs) from thin magnetron-deposited Au–Pd films by nanosecond laser ablation in water is investigated. The films weight loss dependence is studied by thickness, intensity and laser pulses per point. Prepared NPs are transferred onto the silica wafer and characterized by scanning and transmission electron...
Article
Single-shot surface ablation of (001) and (111) oriented natural diamond plates was performed by tightly focused (numerical aperture NA = 0.65) 1030-nm 0.3-picosecond laser pulses with variable polarization azimuth. Surface craters were characterized by scanning electron microscopy in terms of characteristic ablation 1/e-radii and threshold fluence...
Article
Full-text available
Asymmetric spectral broadening combined with an efficient transient stimulated Raman scattering is experimentally demonstrated in a BaWO4 crystal pumped by 0.3 ps 515 nm laser pulse. This effect is explained by a non-instantaneity of the orientational Kerr nonlinearity that is for the first time observed in a solid medium. In this paper, we verify...
Article
Laser inscription of form-birefringent nanograting layers inside fused silica by ultrashort (femto-picosecond) laser pulses at 515 nm was studied as a function of laser, average power and pulsewidth in terms of fabrication regimes. Retardance magnitudes were acquired for single birefringent layers inscribed at different laser parameters, enabling f...
Article
The paper considers the generation of colloidal gold nanoparticles by laser ablation of thin gold films of variable thickness in deionized water. The effect of laser fluence, pulsewidth, exposure, and film thickness on the generation of nanoparticles, its productivity and ergonomicity, particle dispersion and size is studied along with the related...
Article
Full-text available
A simple method for reconstructing the spatial parameters of a laser beam, based on the transport-of-intensity equation, is presented. Registration of cross-section intensity distributions in several planes was carried out using a single CMOS camera. The processing of the experimental measurements with the help of specialized software helped to rec...
Article
Near-IR (wavelength ≈ 1 μm) laser ablation of bulk, chemically-inert gold in water was compared for different laser pulsewidth in broad the range of 300 fs – 100 ns, comparing a number of key ablation characteristics: mass loss, single-shot crater volume and extinction coefficient of the generated colloidal solutions taken in the spectral ranges of...
Article
A comparison of single-pulse laser ablation of gold target by pulses with a 0.3–10 ps duration and a wavelength of 515 nm in air and in water was performed. The radiation was focused on the sample surface through the objectives with numerical apertures NA = 0.65 and 0.25. The influence of the medium, pulse duration, and spot size on the crater morp...
Article
Full-text available
Dynamic optical density spectra were obtained under multipulse excitation of bacterial cultures of S. aureus and P. aeruginosa by 3 μ m mid-infrared ultrashort laser pulses, corresponding to the vibrational excitation of the C–H bonds of the bacterial cell. These spectra demonstrated pronounced laser intensity-dependent blue spectral shift, presuma...
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...
Conference Paper
The interaction effects of the femtosecond laser with the surface have been investigated for a commercially pure titanium VT1-0 depending on the laser energy. Femtosecond laser irradiation (FLI) forms on the titanium surface the periodic surface structures with the periodicity of the laser radiation wavelength used. The influence of the formed stru...
Conference Paper
Surface processing of titanium alloy Ti6Al4V samples with nanosecond laser pulses (λ = 1060 nm, τ = 120 ns) under a thin layer of water has been carried out. Changes in the surface topography and structural-phase state of the near-surface layers of the Ti6Al4V alloy are studied by scanning electron microscopy and X-ray diffraction analysis. It is s...
Article
Results regarding morphological and compositional changes of bimetallic thin film (BMTF), composed of aluminium (Al) and titanium (Ti) nano-layers, by single fs laser pulses, are presented. Laser irradiation was conducted in the air with focused, linearly polarized laser pulses, the duration being 300 fs, wavelength 515 nm, and pulse energy up to $...
Article
Full-text available
The bulk mapping of natural diamond poses problems where it is required to characterize various defects and measure their optical properties in volume. The combination of photoluminescence spectroscopy methods and methods for detecting the state of polarization in the volume will expand the functionality for mapping natural and artificial diamonds....
Article
Full-text available
Optically active defects in natural diamonds form specific spectral bands in the optical absorption and luminescence spectra and are called optical centers. Optical centers in the visible spectral range and their corresponding defects are called color centers. Spectral absorption and luminescence bands usually occupy several tens of nanometers in t...
Article
Full-text available
Silicon p-n junction photoelement fabricated on a p-doped wafer by sulfur-based n-doping of its sub-micron thick surface layer, exhibits at liquid-helium temperatures impurity based near-far IR (2–21 μm) photoconductivity spectra in the form of well-resolved separate bands of neutral and ionized atomic-like and cluster-like sulfur centers. Temperat...
Article
Results concerning the controllable ablation of nano-layered thin films (NLTF) by femtosecond laser pulses are presented. Investigated samples were titanium-aluminum bilayers, deposited on a silicon substrate, with the top titanium or aluminum layer of variable thickness on the surface. Irradiation was done in ambient air with single femtosecond la...
Article
Inter-band photoexcitation in bulk natural and synthetic diamonds by tightly focused near-IR (1030 nm) ultrashort laser pulses of variable duration (0.3-6.3 ps) promotes characteristic UV photoluminescence A-band and phonon-mediated free-exciton recombination bands, respectively, with distinct phonon progressions. The photoluminescence yield in the...
Article
Full-text available
In the context of studying the possibility of inactivation of pathogenic microorganisms, the dynamic transmission spectra of femtosecond laser radiation in the mid-IR range by bacteria of the Pseudomonaus aeruginosa culture planted on a silicon substrate were investigated. Irradiation revealed a blue shift in the characteristic absorption bands of...
Article
The dependence of the threshold fluence for surface ablation of such crystalline materials as silicon and diamond (with orientations (001) and (111)) on the direction of linear polarization of ultrashort pulses of different duration (0.3-3.3 ps) with a wavelength of 515 nm has been studied for the first time. The obtained values of the ablation flu...
Article
Full-text available
Micrometer-thick layers of Pseudomonas aeruginosa bacteria were prepared on fluorite substrates and scanned by focused mid-IR femtosecond laser radiation that was spectrally tuned to achieve the selective excitation of either the stretching C-H vibrations (3 μm), or stretching C = O, C-N vibrations (6 μm) of the amide groups in the bacteria. The en...
Article
Full-text available
A correction to this paper has been published: 10.1140/epjd/s10053-021-00234-0
Article
Full-text available
Впервые проведены исследования зависимости пороговой плотности энергии абляции поверхности таких кристаллических материалов, как кремний и алмаз (с ориентациями (001) и (111)) от направления линейной поляризации ультракоротких импульсов различной длительности (0.3–3.3 пс) с длиной волны 515 нм. Полученные значения пороговой плотности энергии абляци...
Article
Food pathogens (Staphylococcus aureus, Listeria monocytogenes, and Pseudomonas aeruginosa) in planktonic form were subjected to bactericidal treatment by colloidal nanoparticles. NiOx colloidal nanoparticles, as anti-biotic nanomaterial, were produced by laser ablation in deionized water and air, and comprehensively characterized by x-ray diffracti...
Article
Three-segment microtracks were for the first time inscribed in bulk fluorite in the scanning mode via multishot exposure by tightly-focused 515-nm ultrashort laser pulses of variable pulse energy and pulsewidth (0.3-3.8 ps). The local micro/nanoscale material modification and related refractive-index changes within the microstructures, envisioned b...
Article
Full-text available
The article discusses the implementation of ultrafast broadband excitation of A-band luminescence of natural diamond by femtosecond-laser pulses with low-energy near-IR photons. Such regime provides A-band luminescence yield with the fourth-power nonlinearity at low laser intensities and second-power nonlinearity at higher laser intensities. These...
Article
Full-text available
Periodic nanostructures with a period of about 100–150 nm are formed on the surface of nanoporous silicate glass irradiated by sharply-focused laser pulses with a wavelength of 515 nm and a duration of 300 fs and are visualized by scanning electron microscopy. The reflection/transmission spectroscopy of the formed nanostructures in the visible rang...
Article
Full-text available
In this paper, we report a study on Si nanopatterns, fabricated as a one-dimensional (1D) Si nanograting with a sub-wavelength (≈200 nm) period. Unpolarized light normally incidenton the nanopatterned Si becomes partially polarized and chiral over the entire visible range of 380–740 nm. The degree and the state of polarization of light were measure...
Article
Full-text available
High-rate direct femtosecond (fs) laser writing is a well-established technology for fabricating various micro-optical elements in bulk dielectrics. In this technology, the “heat accumulation” effect, occurring during high-repetition rate (∼ 1 MHz) exposure in dielectrics by a fs laser, enables ultralow-energy micro-modification via cumulative heat...
Article
Comparative single-shot pulse study of ablation topographies and depths on Si surfaces excited by 1030-nm sub- (0.3 ps) and pico-picosecond (10 ps) laser pulses at different laser fluences in air and water environments was performed. Fast energy transport via 3D-diffusion of dense electron-hole plasma was revealed at picosecond timescale to extend...
Article
Впервые в объеме пластины флюорита получены двулучепреломляющие микроструктуры, записанные на фиксированной глубине под действием лазерных импульсов с длиной волны 1030 нм, варьируемой длительностью 0.3–3.8 пс и энергией импульсов лазерного излучения. Для всех длительностей лазерных импульсов установлены монотонные восходящие зависимости фазового с...
Article
Full-text available
Topography-dependent tuning of water wettability was achieved on a stainless steel surface textured by nanosecond-laser pulses at different laser fluences, with the minimal contribution of the surface chemical modification. Such differently-wet neighboring surface spots were demonstrated to drive an autonomous directional water flow. A series of el...
Article
Here, we combined shaping and multiplexing of the laser beam to achieve ultrafast femtosecond-laser patterning of Au films with coaxial and circular hole arrays at a printing rate of 10 6 elements per second. Fabrication quality of the developed parallel laser-printing approach was found to be enough to replicate coaxial hole arrays with a resonant...
Article
Full-text available
The transmission spectra of femtosecond laser pulses in the mid-IR range (5–6.6 μm) were investigated of submonolayer of Staphylococcus aureus and Pseudomonas aeruginosa bacteria on a silicon plate in the region of characteristic absorption bands of proteins and lipids, as well as stationary spectra after irradiation. Invertible “translucence” of s...
Article
Ultrafast heating of photoionized free electrons by high-numerical-aperture (0.25-0.65) focused visible-range ultrashort laser pulses provides their resonant impact trapping into intra-gap electronic states of point defect centers in a natural IaA/B diamond with a high concentration of poorly aggregated nitrogen impurity atoms. This excites fine-st...
Article
Full-text available
The relationships between friction coefficients and 3D spatial roughness parameters, such as Sci (surface core fluid retention index), Svi (surface valley fluid retention index) and Sbi (surface bearing index), have been investigated for the laser-induced periodic surface structures (LIPSS) on the TiN coatings. Two types of the surface structures (...
Article
The mid-infrared (IR)-sensitive n/p-junction was fabricated on a p-doped silicon (Si) wafer via ultrashort laser n-type surface hyperdoping and high-temperature annealing. First, the n-type sulfur hyperdoping regimes were studied by 0.3 ps IR (1030 nm) laser nanopatterning of Si surfaces covered by a millimeter-thick liquid carbon disulfide layer....
Article
Spectral broadening of 0.3 ps 515 nm laser pulse in a highly Raman-active BaWO4 crystal and fused silica demonstrates significantly different behavior with the incident pulse energy. While the broadening in fused silica is fairly symmetric with respect to the pump laser pulse wavelength, the Stokes wing broadening in the BaWO4 crystal is 2 times wi...
Article
Full-text available
Multi-shot exposure of silicon surface in air by mid-infrared (MIR, 2.5–5 microns) femtosecond laser pulses results in an initial (Np = 2–5 shots) appearance of a bright spot with abnormally-oriented, bipolar shallow deeply-subwavelength ripples (period ∼ (0.2–0.4)λ, average trench ablation rate ∼ 10–20 nm/shot, trench depth < 100 nm), visualized b...
Article
Full-text available
The backscattering spectra of a 500 nm thick gold film, which was excited near the 525 nm transverse localized plasmon resonance of its constituent, self-organized, vertically-aligned nanorods by normally incident 515 nm, 300 fs laser pulses with linear, radial, azimuthal and circular polarizations, revealed a few-percent conversion into Stokes and...
Conference Paper
Full-text available
The interaction of an ultrashort laser pulse of sub-relativistic intensity with an innovative high-average-density targets consisting of numerous sub-microwires or sheets was examined. The research demonstrates the stochastic nature of high-energy electron production in complicated EM field in such targets where volumetric laser energy absorption o...
Conference Paper
Full-text available
IV International Conference on Ultrafast Optical Science (UltrafastLight-2020) was held on September 28-October 02, 2020 in P.N. Lebedev Physical Institute (LPI) in Moscow, Russia. The mixed (offline and online) Conference format was chosen due to the current quarantine measures and travel restrictions, nonetheless it did not affect the highest qua...
Conference Paper
A design of high-efficient solid-state source of sub-picosecond ~10-m wavelength laser pulse is presented. It is based on difference frequency generation in LiGaS 2 nonlinear crystal of ~0.5 m wavelength laser pulse and its Raman-shifted pulse produced in BaWO 4 crystal. Numerical efficiency of the laser system was estimated to be ~1-2% at experi...
Article
Full-text available
A novel, successful method of bactericidal treatment of pathogenic bacterial biofilms in vitro by laser-induced forward transfer of metallic nanoparticles from a polyethylene terephthalate polymeric substrate was suggested. Transferred nanoparticles were characterized by scanning and transmission electron microscopy, energy-dispersive X-ray and Ram...
Article
Double-pulse femtosecond laser ablation of thin aluminum films and bulk aluminum counterintuitively demonstrated a strong (60-70%) raise of the thickness-dependent thresholds for inter-pulse delays of 20-200 ps, preventing material removal at above-threshold fluencies. Time-resolved optical pump-probe reflection and double-pump transmission studies...
Article
Full-text available
Ultrashort-pulse laser surface and bulk nano-and micromachining of dielectrics have multiple promising applications in micro-optics, microfluidics, and memory storage. The fundamental principles relate intrinsic inter-band multi-photon (MPA) and laser-induced intra-band free-carrier absorption (FCA) to particular ablation mechanisms and features. T...
Article
Full-text available
This paper investigated the diffraction of a Gaussian laser beam on a binary mask and a refractive axicon. The principles of the formation of a zero-order Bessel beam with sharp drops of the axial field intensity edges were discussed. A laser optical system based on an axicon for the formation of a Bessel beam with quasi-uniform distribution of axi...
Conference Paper
Peculiarities of supercontinuum emission generated by sub-picosecond near-IR laser pulses in BaWO4 crystal was experimentally studied. Nonlinear effects contributing to the output spectrum are discussed. Stimulated Raman scattering self-seeded by self-phase modulation emission was observed.
Article
Topography, structure, and phase composition of surface layers of AISI 321 stainless steel textured by 1030-nm 320-fs-laser pulses were studied by scanning electron microscopy and X-ray diffraction analysis. Variation in single-pulse fluence and the number of pulses was found to change the laser-produced surface texture from one-dimensional quasi-p...
Article
Active and passive hybrid ways are described for controlling biofilms and the planktonic form of pathogenic microorganisms based on different bactericidal nanomaterials obtained with modern laser technologies. An innovative mobile laser application of the complete suppression of biofilms in situ is described.
Conference Paper
Full-text available
In experimental backscattering spectra of a gold film were found resonances which may reveal features of the film inner structure. The explanation of these features based on the analysis of the structure's unit cell and its response to laser radiation was proposed. 1. Introduction One of the possible methods for characterization of plasmonic films...
Conference Paper
Full-text available
The action of ultrashort laser pulses on dielectrics leads to the processes of redistribution of the laser pulse energy in the interaction region. The mechanisms of ultrafast energy deposition and the electron dynamics under the action of ultrashort laser pulses determine the type of final structures or elements in the transparent dielectrics. One...