bluuebunny/crossref_metadata_2025 huggingface dataset:
Biosensors based on nanowire field effect transistors with Schottky contacts
Authors: Smolyarova T E , Lukyanenko A V , Tarasov A S , Shanidze L V , Baron F A , Zelenov F V , Yakovlev I A , Volkov N V
Published: December 2019

A top-down nanofabrication approach was used to obtain silicon nanowires from silicon-on-insulator wafers using direct-write electron beam lithography and plasma-reactive ion etching. Fabricated with designed pattern silicon nanowires are 0.4, 0.8, 2 μm in width and 100 nm in height. The devices can be applied in future medical diagnostic applications as novel biosensors with detection principle based on the changes in electrical characteristics of the silicon nanowires functionalized with thiol-containing molecules.
Laser modification of high-pressure high-temperature nanodiamonds
Authors: Mikheev K G , Mogileva T N , Fateev A E , Nunn N , Shenderova O A , Mikheev G M
Published: December 2019

Micro-thin semitransparent films of purified high pressure high temperature nanodiamonds were produced on a glass substrate. A focused 632.8 nm He-Ne laser irradiation is shown to cause an emission of light in the green region of the optical spectrum accompanied with laser-induced blackening of the obtained films. Possible mechanisms of the observed phenomenon are discussed.
Engineering the synthesis procedure for PbS nanosheets with controlled optical properties in the near-infrared region
Authors: Kormilina T K , Skurlov I D , Cherevkov S A , Mudrak A S , Litvin A P , Ushakova E V , Baranov A V , Fedorov A V
Published: December 2019

This work discloses routes of obtaining two-dimensional PbS nanostructures by chemical synthesis methods. Using the techniques of absorption and luminescence spectroscopy, their optical characteristics are revealed. Special attention is paid to the evolution of nanoplates in a colloidal solution. The processes of growth and degradation of the structure of nanoplatelets, as well as the corresponding changes in the optical properties of nanocrystals are considered.
Synthesis and energy structure of optical transitions of the nitrogen and sulfur co-doped carbon dots
Authors: Khavlyuk P D , Arefina I A , Bondarenko D P , Bogdanov K V , Stepanidenko E A , Baranov A V , Fedorov A V , Ushakova E V , Dubavik A , Rogach A L
Published: December 2019

A green and efficient strategy was developed for one-step synthesis of sulfur and nitrogen co-doped carbon dots using urea, thiourea and thioacetamide as nitrogen and sulfur source and citric acid as carbon source. The influence of nitrogen and/or sulfur doping of the carbon dots on their optical transitions is investigated. The as synthesized carbon dots are demonstrated to possess redshifted photoluminescence with relatively high intensity. It is demonstrated that the presence of heteroatoms leads to the red shift of the photoluminescence band and increase of the crystalline phase inherent to amorphous carbon.
The effect of lead and nickel cations on AgInS2/ZnS nanocrystals photoluminescence in aqueous solution
Authors: Korepanov O A , Mazing D S , Aleksandrova O A , Moshnikov V A
Published: December 2019

A sensing fluorescent probe based on the photoluminescence (PL) quenching of the AgInS2 colloidal nanocrystals (NCs) with a wide bandgap ZnS shell was studied for lead ions detection. The results were compared with the work where the influence of nickel ions presence on PL was studied. Addition of lead cations was accompanied by decreasing of PL intensity of the AgInS2/ZnS NCs and redshift of maxima of PL spectra. The quenching effect was described by the Stern–Volmer relationship. The obtained results could be useful for the development of new express-methods for heavy metal detection in aqueous media.
Synthesis and Luminescent Properties of Perovskite Quantum Dots
Authors: Son A G , Krivogina E V , Romanov N V
Published: December 2019

In this paper, we obtained nanoparticles based on ABX3 type of metal halide perovskites using the growth method of colloidal quantum dots in non-polar environment. The development of technological processes allowed us to synthesize the studied nanoparticles with room temperatures. The dependence of the photoluminescence intensity of the concentration of sols dots was determined using the photoluminescence method in the range from 400 to 700 nm. The effect of various stabilizers on the optical properties of nanoparticles was studied and the optimal composition of the stabilizer was defined. The method of dynamic light scattering was used to estimate the approximate dimensions of the synthesized ABX3 type of metal halide nanoparticles.
Investigation of a new C24 cluster for obtaining diamond-like phases: first-principle calculations
Authors: Greshnyakov Vladimir A , Belenkov Evgeny A
Published: December 2019

In this work, first-principle calculations of the structure of a new fullerene-like C24 cluster are carried out. The surface of this cluster is formed of four- and six-membered atomic rings. It is established that these clusters should be stable under normal conditions. A simple cubic fullerite based on the C24 clusters can be used to synthesize the diamond-like CA4 phase under bulk compression up to 4.8 GPa. In addition, X-ray diffraction patterns of the «fullerite C24 → CA4 phase» structural transition are calculated.
Mechanism of formation of light-emitting silicon hexagonal phase 9R-Si
Authors: Nikolskaya A A , Korolev D S , Mikhaylov A N , Belov A I , Konakov A A , Chigirinsky Yu I , Sushkov A A , Pavlov D A , Tetelbaum D I
Published: December 2019

A method of photoluminescence (PL) spectroscopy has been used to study the mechanism of formation of light-emitting hexagonal 9R-Si phase by krypton ion implantation into thermally grown oxide layer on silicon substrate with subsequent annealing. The PL band at ∼ 1246 nm previously assigned to this phase appears at isochronous step-by-step annealing temperatures of 600 °C and higher as well as for one-step annealing. In addition, the PL bands at ∼1324 and ∼1408 nm previously observed in ion-implanted silicon and assigned to self-interstitial complexes are present in our case. The decrease in their intensities and simultaneous enhancement of the 9R-Si band are observed with increase in annealing temperature. It is concluded that the mechanical stresses arising in SiO2/Si system during implantation are responsible for the formation of the 9R-Si phase.
Growth of a multicomponent crystal via Chernov’s mechanism
Authors: Redkov A V , Kukushkin S A , Osipov A V
Published: December 2019

The work is devoted to the growth of a multicomponent crystal via Chernov’s mechanism, namely, due to diffusion of its own components from vapor or solution and their subsequent incorporation directly into steps. Equations describing the rate of advance of a group of equidistant steps are derived taking into account individual properties: diffusion coefficients, atomic volumes of all components.
Monolith GaAsP/Si dual-junction solar cells grown by MBE
Authors: Sobolev M S , Ilkiv I V , Lazarenko A A , Mizerov A M , Nikitina E V , Pirogov E V , Timoshnev S N , Baranov A I , Bouravleuv A D
Published: December 2019

The growth of monolith GaAsP/Si dual-junction solar cells on Si substrates by molecular-beam epitaxy is demonstrated. The technological method for the formation of a highly doped tunnel p+/n+ junction was developed. An obvious increase in the value of the open-circuit voltage indicating the contribution of the top-junction in the total open-circuit voltage monolithic dual-junction solar cells was found.
XPS analysis of metallic wetting layer in In/GaAs system obtained at different growth temperatures
Authors: Eremenko M M , Balakirev S V , Chernenko N E , Ageev O A , Solodovnik M S
Published: December 2019

In this paper we investigate the processes of nucleation and growth of In/GaAs(001) nanostructures by droplet epitaxy. We determined the temperature dependence of the wetting layer thickness. Using the X-ray photoelectron spectroscopy technique to examine of samples with In/GaAs droplet nanostructures formed under different conditions we experimentally confirm an increase in the metallic wetting layer thickness with a decrease in the deposition temperature. Analysis of the data obtained shows that droplet nanostructures consist of In are without Ga impurity.
On the stress relaxation mechanism of GaN thin films grown on Si(111) substrates
Authors: Koryakin A A , Mizerov A M , Bouravleuv A D
Published: December 2019

Gallium nitride (GaN) thin films grown on Si(111) substrates via plasma-assisted molecular beam epitaxy were investigated. The morphology of GaN films was studied by scanning electron microscopy. It was found that GaN films at nanoscale contain a large amount of cavities. The Raman measurements of GaN/Si(111) system were performed and showed that the position of the GaN E2 (TO) band is close to that of unstrained GaN. We proposed a stress relaxation mechanism to explain the low stress state of GaN films.
Investigation of indium antimonide nanoparticles, obtained by the method of liquid chemical etching
Authors: Mikhailov A I , Kabanov V F , Gavrikov M V
Published: December 2019

The possibility of obtaining indium antimonide nanoparticles by method of liquid chemical etching was analyzed. The dependence of obtained nanoparticles size on the etching time and composition of the etcher has been investigated. The nanoparticles were etched in solutions prepared on the basis of the peroxide-ammonia mixture; cetyltrimethylammonium bromide, a cationic surfactant, was used to stabilize the surface of the nanoparticles. The obtained quantum dots of indium antimonide were studied by the methods of differential normalized tunnel current-voltage characteristics, electron microscopy, particle size analysis and spectral dependence of the absorption coefficient.
Arsenic background pressure effect on In droplet morphology
Authors: Mikhaylin I A , Balakirev S V , Eremenko M M , Chernenko N E , Solodovnik M S
Published: December 2019

The paper presents the results of an experimental study of the effect of arsenic background pressure on the characteristics of droplet nanostructures formed by droplet epitaxy. We have shown that with an increase in the initial size of the droplets, the sensitivity of the system to the background pressure decreases. It is shown that the residual pressure of arsenic can be used as an additional control parameter of the droplet epitaxy technique.
Optical activity and SEM of chiral chitosan ascorbates
Authors: Malinkina O N , Zhuravleva Yu Yu , Zudina I V , Shipovskaya A B
Published: December 2019

The effect of the chiosan ascorbate chirality on its structural features in solution and in the solid state was studied using optical rotation dispersion and scanning electron microscopy. It has been established that the isomeric form of ascorbic acid has a significant impact on the stereomeric ordering of chiral chitosan ascorbate macromolecules in solution and solid-phase supramolecular structures isolated therefrom.
Photovoltaic properties of InP NWs/p-Si heterostructure
Authors: Kotlyar K P , Vershinin A V , Reznik R R , Pavlov S I , Kudryashov D A , Zelentsov K S , Mozharov A M , Karaborchev A A , Mukhin I S , Soshnikov I P , Cirlin G E
Published: December 2019

The experimental and modelling results of the investigation of photovoltaic properties of the InP nanowires grown on p-Si substrate are presented. It is shown that InP 2D-layer between nanowires on Si is II-type heterojanction. The resulting structure exhibits an open-circuit voltage (Voc) of 0,37 V, a short-circuit current density (Jsc) of 10.6 mA/cm2, a fill factor (FF) of 0.61 and efficiency of 2.4% at 1 sun. The InP/p-Si structure can be applied as prototype for solar cells or the photosensitive component in an integrated circuit based on silicon technology.
Raman analysis of graphene on SiC
Authors: Shubina K Yu , Sharov V L , Denisov D V , Mukhin I S , Babichev A V
Published: December 2019

The paper presents the results of a study of the structural quality of grapheme produced by the thermal decomposition of 4H-SiC. Maps obtained by atomic force microscopy (AFM mapping) have demonstrated the existence of characteristic terraces on the surface. The Raman spectra have demonstrated the existence of G and 2D lines. A narrow Lorentzian 2D peak and low intensity of the G peak in addition to the reflectance mapping data confirms the conclusion that there is primarily monolayer graphene on the sample surface.
Structal and Optical Properties Algaas Nanowires Grown by Mbe on Si(111) Substrate
Authors: Vershinin A V , Shtrom I V , Kotlyar K P , Filosofov N G , Serov A Yu , Samsonenko Yu B , Ilkiev I V , Reznik R R , Cirlin G E
Published: December 2019

In this work, we present the results of photoluminescence measurements of wurtzite AlGaAs nanowires, coupled with the transmission electron microscopy structural analysis. AlGaAs NWs were grown by molecular beam epitaxy under the nominal aluminum content of 0.3 - 0.8. The results of TEM measurements demonstrated wurtzite crystal structure of AlGaAs nanowires.
The method of intracellular fluorescent species in situ production within living cells by femtosecond laser pulses
Authors: Osychenko A A , Zalessky A D , Shakhov A M , Astafiev A A , Syrchina M S , Tochilo U A , Karmenyan A V , Nadtochenko V A
Published: December 2019

Here we report on a novel non-invasive technique of in situ fluorescence species creation with the use of tightly-focused femtosecond laser beam with 800 nm wavelength. Fluorescent species can be created in a strictly defined area inside a living cell, without damaging the plasma membrane and surrounding structures. Species are characterized by bright fluorescence with a maximum at 520 nm, high stability and low toxicity. No significant effect of fluorescent species on cell viability and development is observed. The technique of in situ fluorescence species creation is an attractive tool for in vivo cell visualization and intracellular tracking because of its high accuracy and low damage effect.
Reduced graphene oxide based nanobiocomposite as basis for flexible biosensors
Authors: Komarov I A , Struchkov N S , Antipova O M , Kalinnikov A N , Shcherbin S N
Published: December 2019

Flexible selective electrochemical biosensor based on reduced graphene oxide film and short oligonucleotides (aptamers) was developed. Laser scribing was applied for graphene reduction due to controllable reduction rate and simple devises pattering. Optimal parameters of film reduction were determined for effective aptamers coupling, by varying laser output power. Mild reduced graphene oxide, as was expected, revealed better reactivity for aptamers coupling. Resistive response to biosensors exposure to thrombin and albumin proteins was measured. As a result we developed bionanocomposite that can be used in a new generation of available low-cost biosensors.
Dynamic characteristics of totally glycosylated human glucocerebrosidase carrying N370S substitution
Authors: Cheblokov A A , Rychkov G N
Published: December 2019

Full-atom models of a totally glycosylated wild type human glucocerebrosidase (GBA) and its mutant form N370S were constructed. Molecular dynamics simulations in explicit water box have revealed high flexibility and mobility of glycans bonded to the enzyme; glycans was able to spread a rather large volume determined by their length. Amino acid substitution N370S decreased the flexibility of GBA polypeptide chain region forming Loop 1 (residues 311-319), while the mobility of catalytic residues remained at the similar level both in wild type and N370S GBA mutant form.
Study of refractive index of human stomach cancer tissue in THz frequency range
Authors: Kuzikova A V , Grigorev R O , Kurasova A P , Demchenko P S , Senyuk A V , Zakharenko A A , Belolipetskaya J R , Khamid A H , Khodzitsky M K
Published: December 2019

In this paper, the samples of healthy and cancer tissues of the internal and external sides of a human stomach were studied by time-domain terahertz reflectometry in the frequency range from 0.2 to 1 THz. Since healthy and cancer tissues have different morphological structure, and also contain different amounts of water, their optical properties and spectral characteristics differ. It was found that the refractive index of internal side of stomach cancer tissue is greater than for the healthy one. The refractive index of the external side of stomach cancer tissue is less than for the healthy one. This effect should be taken into account for development of stomach cancer diagnosis.
Age and gender recognition from speech signals
Authors: Abdulsatar Assim Ara , Davydov V V , Yushkova V V , Glinushkin A P , Rud V Yu
Published: December 2019

The aim of this research is to identify gender and age from speech, the system consists of two parts. The first part is called pre-processing and future extraction. The second part is called classification. This research investigates an automatic gender and age recognizer from speech. First four formant frequencies and twelve MFCCs are used to extract relevant features to recognize the gender. K-NN has been used as a classifier for the age recognizer model, stimulated using MATLAB. A special selectin of solid feature is used in this work to improve the accuracy of the gender and age classifiers based on the frequency range that the features represent.
Shellac hologram
Authors: Toropova A , Fokina M
Published: December 2019

The results of experimental research of rainbow holograms made of edible shellac, analysis of diffraction efficiency and analysis of the hologram lifetime in various environmental conditions are reported in this work. The properties of shellac as a food biopolymer allow to use it for creation edible holographic coatings on food and pharmaceutical products. Edible shellac holograms can be use for creation images not using food dyes, original appearance, labels, sensors of shelf life and observance of storage regulations of products.
Study of human skin radiation in the terahertz frequency range
Authors: Baksheeva K. , Vdovydchenko A. , Gorshkov K. , Ozhegov R. , Kinev N. , Koshelets V. , Goltsman G.
Published: December 2019

The radiation of human skin in the terahertz frequency range under the influence of mental stresses has been studied in the current work. An experimental setup for observation of changes in human skin radiation, which occur under the influence of psychological stresses, by means of a superconducting integrated receiver has been developed. More than 30 volunteers participate in these studies, which allows us to verify presence of correlation between the signals from the superconducting integrated terahertz receiver and other sensors that monitor human mental stress.
Semiconductor resonant all-optical temperature sensor and thermal release trigger of encapsulated anti-cancer drugs for in vitro studies
Authors: Zograf G P , Petrova M I , Petrov M I , Belov P A , Komissarenko F E , Makarova E K , Pushkarev A P , Sun Y , Ghosh P , Li Q , Qiu M , Makarov S V , Zyuzin M V
Published: December 2019

Nanostructures made of high-index semiconductors (n > 2.5) with the several orders of magnitude lower losses than noble metals possess (Au, Ag, Pt etc.) are gaining high interest in recent years for various advanced optical applications, including nanothermometry and optical heating. Owing to the high-Q of Mie-optical modes that are being supported by the nanostructures, such nanoresonators can be considered as a powerful tool for light absorption at the nanoscale. However, high potential of resonant semiconductor nanoparticles in drug release and delivery applications has not been studied yet. In this work, we prove both experimentally and theoretically that optically resonant iron-oxide (III) (Fe2O3) can be employed as a remote optical trigger for thermal rupture of polymer microcontainers used as a drug delivery platform. Such approach allows one to measure real-time temperature via thermally sensitive Raman signal of iron-oxide nanoparticles, that were embedded into the walls of microcontainers. We believe that, suggested system consisting of resonant semiconductor nanoparticles and polymer carrier capsules can serve as a highly efficient drug delivery platform with controllable remote release with temperature feedback.
Development of a measuring device for the study of thermal processes during the polymerase chain reaction
Authors: Reznik V S , Kruglov V A , Petrov A I , Davydov V V , Glinuchkin A P , Rud’ V Yu
Published: December 2019

In this paper, we consider the problem of studying transient temperature processes in thermal blocks of analyzers of nucleic acids based on real-time polymerase chain reaction, in particular, the ANK-32 device. Characteristics of transient temperature processes were obtained using sensors built into the ANK-32. The result of the work is an original measuring device that is able to clarify the characteristics is obtained.
Infection of aerosol concentration on the radon decay products fractions
Authors: Mostafa Mostafa Y A , Khalaf Hyam N B , Zhukovsky M
Published: December 2019

In this work, an experimental setup has been constructed to study the effect of aerosol concentration on the size distribution and unattached fraction of radon decay products. The experiments are conducted with 2 m3 standard radon chamber under controlled conditions (aerosol concentration, temperature and humidity). Number concentration and size distribution of aerosols inside radon chamber are measured with a Diffusion Aerosol Spectrometer (DAS 2702M, range from 5 nm to 10 μm). The activity size distribution of radioactive aerosols is estimated with diffusion battery. Number distribution diameter at low aerosol concentration has interval 50-100 nm. When additional aerosols injected to the radon chamber, distribution peak shifted to large diameters 70-150 nm at high aerosol particle concentration. At high aerosol concentration the unattached fraction fell sharply to 10-15% of the total activity compared to 50-70% when the aerosol concentration is low. The ratio between the fractions of the unattached and attached is in the range from 0.9 to 1.2 at low aerosol concentration. At high aerosol concentration, this ratio becomes from 0.09 to 0.14.
The empowerment of biometric systems of psychophysical research
Authors: Bobrova D , Boronenko M , Bikberdina N
Published: December 2019

Interest in detecting the psychophysical state of a person according to various biometric data (KGR, pupillography and profiling, etc.) is becoming more widespread every year. The most statistically reliable and resistant to counterfeiting systems are the identification of a person by the iris and face. Biometric identification systems can be combined. This paper presents proposals for improving the existing systems of recognition of the psychophysical state of a person.
Formation of Structurally Ordered Nanoscale Complexes of DNA with Nuclear Proteins HMGB1 and H1
Authors: Chikhirzhina E , Romanov N , Polyanichko A
Published: December 2019

The structural organization of DNA in complex with linker histone H1 and non-histone chromosomal protein HMGB1 have been studied using atomic force microscopy and vibrational spectroscopy. The possibility of formation ordered nanoscale DNA-protein complexes is reported.
Upconversion luminescence of CaF2-SrF2-ErF3 single crystals upon 1.5 μm laser excitation
Authors: Lyapin A A , Ermakov A S , Kuznetsov S V , Gushchin S V , Ryabochkina P A , Konyushkin V A , Nakladov A N , Fedorov P P
Published: December 2019

In present work, the spectral-luminescent properties of CaF2-SrF2-ErF3 (CaF2-SrF2:Er) single crystals were investigated. The upconversion luminescence (UCL) of CaF2-SrF2: Er in the visible and infrared spectral regions upon excitation of the 4I13/2 level Er3+ ions were studied for the first time. The absolute energy yields of the UCL upon laser excitation at 1.5 μm are determined for CaF2-SrF2:Er. The possible application of fluoride crystals for increasing the efficiency of solar cells was discussed.
Memristive properties of solar cells based on perovskite and polymer composite
Authors: Masharin M A , Gets D S , Verkhoglyadov G S , Makarov S V , Zahidov A A
Published: December 2019

Organic-inorganic halide perovskites recently have emerged as a perspective material for using in solar cells. This material has many perspective properties, one of them is the ion migration. Modern ionic memristors, electric circuit elements that can change its resistance depending on the current flowing through it, is based on this phenomenon. In this paper, we present the experimentally obtained memristic properties in the perovskite solar cell, which contains composite of perovskite and polymer as absorbing layer instead of pure perovskite.
The study of the optical properties of transparent conductive oxides SnO2:Sb, obtained by spray pyrolysis
Authors: Zinchenko T O , Pecherskaya E A , Nikolaev K O , Golubkov P E , Shepeleva Y V , Artamonov D V
Published: December 2019

The study results of the dependences of the refractive index and samples transmittance of transparent conductive films of tin dioxide depending on wavelength are presented. Films with different doping levels, with different solutions volumes were synthesized on an automated installation by spray pyrolysis. It is shown that the transmittance practically does not depend on the amount of substance sprayed onto the substrate; the transmittance practically does not depend on the solution volume, but depends on the impurity concentration. The chemical composition and temperature of film deposition influence on its refractive index is established. The research results can be used in the development of technologies for the manufacture of optoelectronic structures containing transparent conductive coatings.
Design and investigation of GaPAsN/Si light-emitting diode
Authors: Lazarenko A , Gudovskikh A , Baranov A , Sobolev M , Pirogov E , Nikitina E
Published: December 2019

The heterostructure of light-emitting diode on a silicon substrate with an active region based on A3B5N was synthesized and investigated. Light-emitting diode demonstrates effective electroluminescence at 645 nm up to the 360 K. This indicates the high crystalline and optical quality of the light-emitting structure, as well as the prospects of this approach for the development of silicon integrated photonics.
Development of antireflective coatings based on SiO2/Si3N4 on textured silicon for heterojunction solar cells
Authors: Nevenchannyy Y , Khoruzhiy K , Kudryashov D
Published: December 2019

The technology of antireflective coatings formation on textured silicon by magnetron sputtering was developed. The growth rates of individuals thin films were determined as well as their refractive indexes. According to the results obtained an antireflective coating based on SiO2/Si3N4 on textured silicon with a thickness of SiO2 68 nm and Si3N4 of 74 nm showed the lowest reflection.
Experimental study of self-induced transparency mode-locking in Ti:sapphire laser
Authors: Arkhipov M V , Arkhipov R M , Shimko A A , Babushkin I , Rosanov N N
Published: December 2019

In this paper, passive mode-locking in Ti:sapphire laser with a coherent absorber cells with rubidium vapor placed in the cavity is demonstrated experimentally. For the best of our knowledge these experiments are the first time experimental demonstration of passive mode-locking based on self-induced transparency regime in the coherent absorber. Up to now, such a regime has not been observed experimentally and was predicted only theoretically.
The influence of the method of applying a smearing layer on the surface characteristics of steel X12CrNiTi18-10 after laser alloying
Authors: Proskuryakov V , Rodionov I , Koshuro V , Fomin A , Borodina S
Published: December 2019

A comparative analysis of the influence of the method of applying a smearing layer of graphite paste and anatase powder on the morphology and hardness of stainless chromium-nickel steel X12CrNiTi18-10 was carried out. It has been established that for hardening the surface of stainless steel it is advisable to use a smearing consisting of two layers: 1 - graphite paste and 2 - anatase nanoparticles powder. Laser pulsed doping of the surface with the specified coating structure allows forming a hardened modified layer with a thickness of 60 μm on steel, with a hardness value of up to 6 ±0.1 GPa with a total porosity of 44%.
NdYAG surface modification of ZnO for solar cells
Authors: Redka D , Mukhin N , Grishkanich A , Terukov E , Hirsch S , Ignateva L
Published: December 2019

Zinc oxide films are used as a photovoltaic transparent electrodes for current collection. They are a good substitute for expensive transparent electrodes on the basis of Indium tin oxide. The ZnO films fabricated with a certain morphology of the structure are able to act as a light diffuser.
Shapes of polarization sensitive photocurrent pulses in Ag/Pd nanocomposite films: influence of firing temperature
Authors: Saushin A S , Styapshin V M , Aleksandrovich E V , Svirko Yu P , Mikheev G M
Published: December 2019

The results of investigation of the shapes of polarization-sensitive photocurrent pulses in nanocomposite Ag/Pd films with different temperatures of firing are presented. Ag/Pd nanocomposite films were produced in accordance with thick film technology at temperatures T = 773 and 1013 K. Photocurrent excitation was carried out by femtosecond laser pulses. The obtained polarization photocurrent dependencies are characteristic for photocurrent due to photon drag and surface photogalvanic effects. It was shown that longitudinal photocurrent pulse duration in 773 K films (26 ns) is significantly longer than in 1013 K films (3 ns).
Direct GaInP-to-Ge optical interaction in the triple-junction solar cells with thinned intermediate GaAs subcell
Authors: Levina S A , Filimonov E D , Mintairov M A , Shvarts M Z
Published: December 2019

In the present work processes of direct light coupling in the triple-junction solar cells between top GaInP (wide band gap) and bottom Ge (narrow band gap) subcells are considered, when parameters of intermediate optical medium (comprised of middle GaAs p-n junction layers) are changed. Conditions of luminescent coupling gain and blocking are studied in multijunction structures with selectively tuned built-in photonic structures such as Bragg reflectors. An ability to manage the efficiency of optical interaction between subcells is investigated.
Organic light-emitting diodes with colloidal quantum dots in the active layer
Authors: Degterev A E , Mikhailov I I , Lamkin I A , Tarasov S A
Published: December 2019

In this research we have created light-emitting structures that contain colloidal quantum dots of cadmium selenide in the active layer. To do so, we have used methods of vacuum thermal deposition and spin coating for the formation of organic layers. We have compared photo- and electroluminescence spectra of the structures, and have revealed necessary conditions for the creation of high quality layers.
Current induced mode competition in microdisk lasers
Authors: Boikov I K , Savelyev A V , Breuer S , Korenev V V , Kudryavcev K E , Kryzhanovskaya N V , Maximov M V , Zhukov A E
Published: December 2019

A phenomenon of mode competition in microdisk lasers under various injection currents was studied. The increase of the injection current causes rise of the internal temperature. The modeling has shown that this increase leads to the shift of the gain spectrum. That may be enough to cause drastic redistribution of emitted power between microdisk modes. This effect has been studied in the experiment and by the numerical simulation.
Synthesis, structure and spectroscopy of Fe2+:MgAl2O4 transparent ceramics
Authors: Basyrova L , Balabanov S , Belyaev A , Drobotenko V , Volokitina A , Vitkin V , Dymshits O , Loiko P
Published: December 2019

Transparent ceramics based on magnesium aluminium spinel, MgAl2O4, doped with iron ions (Fe2+) are synthesized by hot pressing (at 1500 °C / 50 MPa) of powders obtained by the sol-gel method. The ceramics are characterized by X-ray diffraction, SEM, Raman and optical spectroscopy. The ceramics exhibit a broad (1.3-3.5 μm) absorption due to the 5E → 5T2 (5D) transition of Fe2+ ions in Td
sites and they are promising for applications as saturable absorbers of mid-infrared lasers.
Interface Layers of Niobium Nitride Thin Films
Authors: Lubenchenko A V , Iachuk V A , Krause S , Pavolotsky A B , Ivanov D A , Lubenchenko O I , Pavlov O N
Published: December 2019

Intermediate layers formed by thin NbN films are studied. A surface phase of NbN different from the bulk one under the oxide layer and a layer consisting of NbN
x
-SiO
y
between the film and the substrate are found.
Flat-top laser beams over an extended range
Authors: Reddy Andra Naresh Kumar , Pal Vishwa , Mahler Simon , Friesem Asher A. , Davidson Nir
Published: December 2019

Designs based on single diffractive-optical-elements for obtaining flat-top laser intensity distributions that remain constant over a long range during free-space propagation are presented. Flat-top beams with different orders n exhibit a different range of propagation. For various working distances z, the resulting flat-top beam yields a different depth of focus. By controlling spectral properties of laser distributions, it is possible to maintain invariant flat-top intensity distributions for relatively long propagation distances.
Theoretical optimization of the photolithography through array of 1.2 μm silica microspheres
Authors: Dvoretckaia L N , Mozharov A M , Bolshakov A D , Fedorov V V , Vasiliev A A , Mukhin I S
Published: December 2019

Interest in heteroepitaxy of III-V compounds on Si has been growing rapidly in recent years due to the potential of the optoelectronic components integration on silicon. However, most of the semiconductor compounds conventional in optoelectronics cannot be easily integrated on Si substrates due to the formation of the lattice defects. In this paper, we consider the fabrication of the mask consisting of the ordered nanoscale holes with the use of microsphere photolithography for selective epitaxial growth – promising approach for nanostructures fabrication on mismatched substrates. We have carried out the calculation of electromagnetic wave absorption in the photoresist layer through 1.2 μm microspherical silica lenses. The theoretical optimization of the photoresist thickness parameter allowed to obtain a value at which the minimum holes diameter in the photoresist is achieved. These data are necessary for carrying out the process of lithography through microspherical lenses to create a patterned growth mask.
On the need to control the state of the flowing media by the values of relaxation constants
Authors: Myazin N S , Davydov V V , Yushkova V V , Glinushkin A P , Taranda N I , Rud’ V Yu
Published: December 2019

The article substantiates the necessity of measuring the longitudinal T1 and transverse T2 relaxation times of the flowing media to control its state. For such measurements, a new method for measuring T1 in a flowing fluid is proposed. Therefore, the results of experimental studies are presented. In addition, measured values of relaxation constants were compared to the data obtained on industrial devices was performed. The results of this comparison are also presented.
Optical properties of Fe- and Nd-doped ZnSe crystals measured by pump-probe spectroscopy
Authors: Zhukova M O , Nabilkova A O , Putilin S E , Chegnov V P , Chegnova O I , Tcypkin A N
Published: December 2019

We present the excited-state dynamics and optical properties of Fe- and Nd-diffusion doped zinc selenide polycrystals with different concentration measured by pump-probe spectroscopy in the visible and NIR range (400-1000 nm). The introduction of dopants allows one to control the optical properties of samples, which then can be used to create effective optoelectronic components for wide spectral ranges.
Energy transfer in heteronuclear rare gas clusters under multiphoton excitation and ionization
Authors: Balmaev I , Serdobintsev P , Melnikov A , Pastor A , Khodorkovskiy M
Published: December 2019

The ionization processes of the ArM, XeN and XeNArM clusters in a supersonic beam with multiphoton excitation were studied. The third 263 nm harmonics of a femtosecond Ti : sapphire laser were used for excitation and ionization. Kinetic energy spectra of photoelectrons has been recorded by a magnetic bottle time-of-flight electron spectrometer. Analysis of the electronic spectra of multiphoton ionization of clusters shows that, in heteronuclear clusters, the transfer of excitation energy between xenon and argon atoms plays a significant role in ionization.
Influence of neutron irradiation on optoelectronic properties of structures with the InAs/GaAs quantum dots
Authors: Volkova N S , Gorshkov A P , Trufanov A N , Istomin L A , Levichev S
Published: December 2019

The effect of neutron irradiation on the photosensitivity of the InAs/GaAs quantum dots has been investigated. It was shown that after neutron irradiation with a fluence of 1.5×1015 cm-2 the photosensitivity at the room temperature has been decreased at 3 times, whereas the shape of the photosensitivity’s temperature dependence didn’t reveal any visible changes, despite an appearance of defects in quantum dot layer. The effect was explained by the difficulty of a motion of photoexcited carriers in quantum dot layer to the recombination centres arised after irradiation.
Fabrication and optical properties of Au:SiO2 nanostructured thin films
Authors: Ilkiv I V , Morozov K M , Kotlyar K P , Amelchuk D. , Bouravleuv A D
Published: December 2019

We demonstrate synthesis and theoretical study of the optical properties of Au:SiO2 nanocomposite thin films. Localized surface plasmon resonance peak induced by Au NPs was clearly observed in optical spectra at wavelength range between 500 and 600 nm. Intensity and position of PL peak are demonstrated to depend on the Au NPs embedding depth.
Spectral and luminescent properties of codoped Er-Yb fluorophosphates glasses with small content of phosphate
Authors: Bogdanov O , Kolobkova E
Published: December 2019

Novel fluorophosphate glasses with small content of phosphate doped by various concentration of ErF3 and 5 mol. % of YbF3 were obtained. Absorption spectrum and experimental τexp lifetimes for all concentration of ErF3 were measured. Radiation lifetime of the excited state τexp and emission cross-section σemi were calculated. It was shown that the highest quantum yield q (100%), τexp (9 ms) and σemi (0.64×10-20 cm-2) corresponds to 0.5 mol. % ErF3.
Simulation of infrared photonic crystal fibers based on crystals system AgBr – TlBr0.46I0.54
Authors: Salimgareev D. D. , Lashova A.A. , Shmygalev A. S. , Lvov A.E. , Zhukova L. V.
Published: December 2019

In this paper, a computer simulation of photonic crystal fibers (PCF) based on the AgBr – TlBr0.46I0.54 system was performed. The simulation was carried out in the SMTP program integrated into Matlab. As a simulation result, PCF with the hexagonal structure of PBG-inserts with an increased mode field diameter of up to 200 μm was obtained.
Towards an efficient light-emitting source based on self-implanted silicon with dislocation-related luminescence
Authors: Korolev D S , Nikolskaya A A , Tereshchenko A N , Mikhaylov A N , Belov A I , Tetelbaum D I
Published: December 2019

The regularities of ion synthesis of dislocation-related luminescence centers in silicon have been investigated. By varying the conditions of additional irradiation with boron ions, as well as the conditions of subsequent annealing, we obtain an increase in the luminescence intensity, as well as a shift of maximum of the temperature dependence towards higher temperatures. It was found for the first time that, for the highest used dose of boron ions (3·1017 cm-2) and additional heat treatment at 830 °C, it is possible to get the measurable luminescence at room temperature.
The research of temperature instability influence of fiber optic communication line in phase direction finder channels on peleng accuracy
Authors: Podstrigaev A S , Lukiyanov A S , Smolyakov A V , Shishkov A N , Davydov V V , Glinuchkin A P , Sinicyna E A
Published: December 2019

In the article the influence of optical fiber temperature change to phase shift between optical signals in transmission channels is considered. The method for influence assessment of temperature phase shift on bearing accuracy is proposed. The results of experimental researchers and calculations are presented.
Properties of GaN optomechanical nanobeam cavity
Authors: Morozov K M , Ivanov K A , Girshova E I , Sokolovskii A S , Mikitchuk A P
Published: December 2019

Gallium nitride based nanobeam cavity system was theoretically analysed by using finite element method-based model. Optical and mechanical resonant localized modes structure of the nanobeam cavity was calculated. Depend on the geometrical properties there were found modes with high quality factor for the both cases. The maximum optical quality factor reaches value 5.104 in cavity with value d = 90nm.
Topological plasmon-polariton on a Dirac magnet helical state
Authors: Iorsh I V , Rakhmanova G R , Titov M
Published: December 2019

A one-dimensional plasmon-polariton which is characterized by non-linear dispersion is supported by electromagnetic field interacting with topologically protected helical state. The electronic helical state arises at the surface of topological insulator in the close proximity of the ferromagnet. In a two-dimensional Dirac magnet these electro-optical excitations are limited by domain walls. Topological electronic imagining of domain walls can provide generally a novel tool to couple magnetic dynamics with both transport and optical properties of helical electronic states An exact dispersion relation for the topological plasmon-polariton were obtained.
Optical trapping and arrangement with reconfigurable “bottle” beam for digital holographic microscopy
Authors: Shostka N V , Sokolenko B N , Karakcheva O S , Poletaev D A , Titova A O , Prisyazhniuk A V , Ismailov I A
Published: December 2019

The design and construction of optical tweezers based on uniaxial crystal anisotropy for generation of adjustable “bottle” beam trap carrying optical vortex with orbital angular momentum is considered. In coupling with digital holographic microscopy, optical trapping becomes a high precision instrument for visualization, shape definition and refractivity measurements of isolated micro structures and biological objects in-situ. The non-destructive and sterile non-contact tweezing of specimens or their parts in localized intensity minima of coherent vortex beam was performed with using of 200 mW semiconductor 532 nm trapping laser and LiNbO3 crystal. Visualization and position control of trapped marine centric diatoms was performed by a lens-free axial digital holographic microscopy in liquid medium.
Extracting hot-spot correlation length from SNSPD tomography data
Authors: Polyakova M I , Florya I N , Semenov A V , Korneev A A , Goltsman G N
Published: December 2019

We present data of quantum detector tomography for the samples specifically optimized for this problem. Using this method, we take results of hot-spot correlation length of 17 ± 2 nm.
Static light scattering for determination of physical parameters of macro- and nanoparticles
Authors: Kolokolnikov I , Nepomnyashchaya E , Velichko E
Published: December 2019

The work is dedicated to determination of physical parameters of micro- and nanoparticles by static light scattering method. We present static light scattering device and theory to determine sizes of particles in suspensions. We analyze calculated distributions of scattering intensity for particles of different sizes and compare it with experimental data, received for spherical particles of different sizes. We also suggest theory to calculate form factor of scattering intensity for micro- and nanoparticles of different shapes. We also demonstrated that Rayleigh scattering theory is better to be applied for small particles investigation.
Effective formation of diffraction-free laser beams based on the diaphragm of the annular spatial spectrum
Authors: Khorin PA
Published: December 2019

In this article, we simulate the formation of diffraction-free beams, which combine some of the properties required for technologies such as planar microscopy, information coding and optical manipulation. Analytical functions in combination with a diaphragmed annular spatial spectrum are proposed as an optical beam. The analysis is carried out at distribution in the free environment and lens systems.
X-Ray linear polarization degree for RGBL beamline BESSY II
Authors: Petrova O V , Mingaleva A E , Sivkov D V , Nekipelov S V , Skandakov R N , Sivkov V N
Published: December 2019

The results of the calculation of the X-Ray synchrotron radiation linear polarization degree of Russian-German dipole beamline at synchrotron BESSY II are discussed. It is shown that the integral synchrotron radiation linear polarization degree (λ, ψh) for incident photon energy ε=300eV reaches 80%
CWDM demultiplexer using anti-reflection, contra-directional couplers based on silicon nitride rib waveguide
Authors: Zubkova E , Golikov A , An P , Kovalyuk V , Korneev A , Ferrari S , Pernice W , Goltsman G
Published: December 2019

We report on the development and fabrication of a 9-channel coarse wavelength-division multiplexing for telecommunication wavelengths (1550 nm) using anti-reflection contra-directional couplers, based on silicon nitride (Si3N4) rib waveguide. The transmitted and reflected spectrum in each channel of the demultiplexer were measured. The average full width at half maximum of the transmitted (reflected) spectra is about 3 nm.
Ultraspectral UV polychromator for SRS-isotopic sensor
Authors: Zhevlakov A , Miharev E , Grishkanich A , Chubchenko Y , Ignateva L , Paklinov N
Published: December 2019

We have developed a spectral module for the selection of narrow characteristic spectral lines of isotopes in the ultraviolet Raman spectral channel. To allow resolving closely spaced isotope lines in the continuous input radiation spectrum, extremely high resolution λ / Δλ = 1000 is implemented. The total inverse linear dispersion at the output of the double polychromator (dλ / dl = 0.048 nm / mm) allows us to confidently separate the methane lines 283.31; 284.42 nm.
Increasing efficiency of GaN HEMT transistors in equipment for radiometry using numerical simulation
Authors: Tikhomirov V G , Gudkov A G , Agasieva S V , Dynaiev D D , Popov M K , Chizhikov S V
Published: December 2019

The numerical impact modeling of some external effects on devices based on AlGaN/GaN heterostructures (HEMT) was carried out. The mathematical model was created that allowed to predict the behavior of the drain current depending on condition changes in the heterostructure in the buffer region and to start the process of directed construction optimization of the devices based on AlGaN/GaN HEMT with the aim of improving their performances.
Quantum-mechanical models for calculating the electrical characteristics of semiconductor 2-d structures for technological optimization of nanoelectronics devices based on them
Authors: Koziy A A , Vetrova N A , Pchelintsev K P , Shashurin V D , Meshkov S A
Published: December 2019

In this paper, a computational algorithm has been developed for the quantum-mechanical model for predicting the electrical properties of 2-d semiconductor structures of nanoelectronics devices with a low-dimensional channel. The most important advantage of the developed algorithm is its scalability for the problems of technological optimization of nanoelectronics devices. An example of application of the developed software to solving the problem of predicting the electrical properties of a low barrier detector sub-terahertz diode with zero-bias in the framework of solving the problem of its technological optimization is presented.