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Electron diffusivity measurements of VN superconducting single-photon detectors
Journal of Physics: Conference Series. 2018. No. 1124. P. 1-6.
Smirnov K., Золотов Ф. И., Romanov N., Vakhtomin Y., Divochiy A.
The research of ultrathin vanadium nitride (VN) films as a promising candidate for superconducting single-photon detectors (SSPD) is presented. The electron diffusivity measurements are performed for such devices. Devices that were fabricated out from 9.9 nm films had diffusivity coefficient of 0.41 cm2 /s and from 5.4 nm – 0.54 cm2 /s. Obtained values are similar to other typical SSPD materials. The diffusivity that increases along with decreasing of the film thickness is expected to allow fabrication of the devices with improved characteristics. Fabricated VN SSPDs showed prominent single-photon response in the range 0.9-1.55 µm
Золотов Ф. И., Divochiy A., Vakhtomin Y. et al., Journal of Physics: Conference Series 2018 No. 1124 P. 1-6
We researched the relation between deposition and ultra-thin VN films parameters.
To conduct the experimental study we varied substrate temperature, Ar and N2 partial pressures
and deposition rate. The study allowed us to obtain the films with close to the bulk values
transition temperatures and implement such samples in order to fabricate superconducting
single-photon detectors ...
Added: December 27, 2018
Korneeva Y., Золотов Ф. И., Korneev A., Superconductor Science and Technology 2021 P. 1-10
We report our study of detection efficiency (DE) saturation in wavelength range 400 - 1550 nm for the NbN Superconducting Microstrip Single-Photon Detectors (SMSPD) featuring the strip width up to 3 μm. We observe an expected decrease of the $DE$ saturation plateau with the increase of photon wavelength and decrease of film sheet resistance. At ...
Added: June 9, 2021
Borovitskaya I. V., Nikulin V. Y., Bondarenko G.G. et al., Russian Metallurgy (Metally) 2018 No. 3 P. 266-275
The effect of powerful pulsed fluxes of nitrogen plasma and nitrogen ions generated in the PF-4
Plasma Focus setup (LPI; energy flux density of plasma pulse was 108–1010 W/cm2) on the modification of
vanadium surface is studied. Melting and ultrafast solidification result in a fine cellular structure (cell size of
100–200 nm) in a thin surface layer in ...
Added: June 23, 2018
Borovitskaya I. V., Pimenov V. N., Gribkov V. A. et al., Russian Metallurgy (Metally) 2017 No. 11 P. 928-935
The structural changes in the vanadium sample surface are studied as functions of the conditions of irradiation by pulsed high-temperature deuterium plasma and deuterium ion fluxes in the Plasma Focus installation. It is found that processes of partial evaporation, melting, and crystallization of the surface layer of vanadium samples take place in the plasma flux ...
Added: January 23, 2018
Baeva E., Sidorova M. V., Korneev A. et al., Physical Review Applied 2018 Vol. 10 P. 1-8
We investigate thermal properties of a NbN single-photon detector capable of unit internal detection efficiency. Using an independent calibration of the coupling losses we determine the absolute
optical power absorbed by the NbN film and, via a resistive superconductor thermometry, the thermal resistance Z(T) of the NbN film in dependence of temperature. In principle, this approach
permits ...
Added: January 3, 2019
Shcherbatenko M., Elezov M., Manova N. et al., Applied Physics Letters 2021 Vol. 118 Article 181103
High sensitivity imaging at the level of single photons is an invaluable tool in many areas, ranging from microscopy to astronomy. However, development of single-photon sensitive detectors with high spatial resolution is very non-trivial. Here we employ the singlepixel imaging approach and demonstrate a proof-of-principle single-pixel single-photon imaging setup. We overcome the problem of low ...
Added: May 6, 2021
Dryazgov M., Semenov A., Manova N. et al., Journal of Physics: Conference Series 2020 Vol. 1695 Article 012195
The present paper describes a modelling of normal domain evolution in superconducting strip of micron width using solving differential equations describing the temperature and current changes. The solving results are compared with experimental data. This comparison demonstrates the high accuracy of the model. In future, it is possible to employ this model for improvement of ...
Added: February 24, 2021
Elmira Baeva, Sidorova M., Korneev A. et al., AIP Conference Proceedings 2018 Vol. 1936 No. 1 P. 020003-1-020003-4
Measuring the thermal properties such as the heat capacity provide information about intrinsic mechanisms operated inside. In general, the ratio between electron and phonon specific heat Ce/Cp shows how the absorbed energy shared between electron and phonon subsystems. In this work we make estimations for amplitude-modulated absorption of THz radiation technique for investigation of the ...
Added: April 1, 2018
Золотов Ф. И., Goltsman G., smirnov e. et al., Journal of Physics: Conference Series 2018 No. 1124 P. 1-4
We demonstrate superconducting niobium nitride nanowires folded on top of lithium
niobate substrate. We report of 6% system detection efficiency at 20 s-1 dark count rate at
telecommunication wavelength (1550 nm). Our results shown great potential for the use of NbN
nanowires in the field of linear and nonlinear integrated quantum photonics. ...
Added: December 27, 2018
Золотов Ф. И., Smirnov K., Divochiy A. et al., Optics Letters 2018 Vol. 43 No. 24 P. 6085-6088
We demonstrate niobium nitride based superconducting single-photon detectors sensitive in the spectral range 452–2300 nm. The system performance was tested in a real-life experiment with correlated photons generated by means of spontaneous parametric downconversion, where one photon was in the visible range and the other was in the infrared range. We measured a signal to noise ...
Added: December 27, 2018
Боровицкая И. В., Никулин В. Я., Bondarenko G. et al., Металлы 2018 № 2 С. 54-64
Проведено исследование влияния мощных импульсных потоков азотной плазмы и ионов азота, генерируемых в установке Плазменный фокус ПФ4 (ФИАН) (плотность потока энергии плазменного импульса от 108 до 1010 Вт/см2) на модификацию поверхностных слоев ванадия. В результате плавления и сверхбыстрой кристаллизации в тонком поверхностном слое образцов формируется мелкоячеистая структура с размером ячеек 100-200 нм. Показано, что существуют ...
Added: April 25, 2018
Боровицкая И. В., Пименов В. Н., Грибков В. А. et al., Металлы 2017 № 6 С. 30-37
Проведено исследование структурных изменений поверхности ванадия в зависимости от режимов облучения импульсными потоками высокотемпературной дейтериевой плазмы и ионов дейтерия в установке Плазменный фокус. Обнаружено, что при плотности мощности потока плазмы в интервале q = 108 – 1010 Вт/см2, а потока ионов – в диапазоне q = 1010 – 1012 Вт/см2, происходят процессы частичного испарения, плавления ...
Added: December 13, 2017
Korneeva Y., Vodolazov D. Y., Semenov A. V. et al., Physical Review Applied 2018 Vol. 9 No. 6 P. 1-13
We demonstrate experimentally that single photon detection can be achieved in micron-wide NbN bridges, with widths ranging from 0.53\,μm to 5.15\,μm and for photon-wavelengths from 408\,nm to 1550\,nm. The microbridges are biased with a dc current close to the experimental critical current, which is estimated to be about 50\the theoretically expected depairing current. These results ...
Added: May 26, 2018
Antipov A., Seleznev V., Vakhtomin Y. et al., IOP Conference Series: Materials Science and Engineering (MSE) 2020 Vol. 781 No. 1 P. 012011-1-012011-5
Spectral characteristics of WSi and NbN superconducting single-photon detectors with different surface resistance and width of nanowire strips have been investigated in the wavelength range of 1.3-2.5 µm. WSi structures with narrower strips demonstrated better performance for detection of single photons in longer wavelength range. The difference in normalized photon count rate for such structures ...
Added: December 10, 2020
Budkov Y., Kolesnikov A. L., Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159
Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...
Added: November 30, 2018
Kalmykov A., Melentiev P., Balykin V., Laser Physics Letters 2020 Vol. 17 No. 4 P. 045901
In this paper we present measurements and comparison of SPP propagation length at the practically important telecom wavelength (1560 nm) as well as in the near-infrared and visible spectral ranges. The measurements were carried out for plane SPP waves excited on Ag film surface using optical microscopy of SPP waves in the far field. We ...
Added: January 15, 2021
M. : Faculty of Physics, MSU, 2017
The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...
Added: October 1, 2017
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019
Казанцев Д. В., Казанцева Е. А., Кузнецов Е. В. et al., Известия РАН. Серия физическая 2017 Т. 81 № 12 С. 1709-1714
Описаны принципы работы безапертурного сканирующего микроскопа ближнего оптического поля (ASNOM). Зондом в приборе служит металлизированная игла атомно-силового микроскопа, и оптическое взаимодействие с объектами на поверхности локализовано вблизи ее острия размером в несколько нанометров. Тело иглы имеет длину в несколько микрон, и это обеспечивает высокую эффективность ее электромагнитного взаимодействия с падающими на нее извне и излучаемыми ...
Added: December 6, 2020
Bodrova A., Osinsky A., Brilliantov N., Scientific Reports 2020 Vol. 10 Article 693
We study analytically and numerically the distribution of granular temperatures in granular mixtures for
different dissipation mechanisms of inelastic inter-particle collisions. Both driven and force-free systems
are analyzed. We demonstrate that the simplified model of a constant restitution coefficient fails to
predict even qualitatively a granular temperature distribution in a homogeneous cooling state. At the
same time we reveal ...
Added: February 25, 2020
Демин А. С., Масляев С. А., Пименов В. Н. et al., Физика и химия обработки материалов 2017 № 6 С. 5-17
Изучено влияние облучения в установке Плазменный фокус PF-1000 экстремальными энергетическими потоками быстрых ионов дейтерия (Ei≈100 кэВ, плотность мощности qi≈1011-1012 Вт/см2, длительность импульса ti≈10-50 нс) и дейтериевой плазмы (qpl≈109- 1010 Вт/см2, tpl≈50-100 нс) на структуру поверхностного слоя молибденовой пластины с учетом его плавления, частичного испарения и закалки расплава. На облученной поверхности обнаружено образование капельных структур, пор, ...
Added: December 25, 2017
Dziom V., Shuvaev A. V., Shchepetilnikov A. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 4 Article 045305
The integer quantum Hall effect is a well-studied phenomenon at frequencies below about 100 Hz. The plateaus in high-frequency Hall conductivity were experimentally proven to retain up to 33 GHz, but the behavior at higher frequencies has remained largely unexplored. Using continuous-wave terahertz spectroscopy, the complex Hall conductivity of GaAs/AlGaAs heterojunctions was studied in the ...
Added: December 11, 2020
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016
A.Aronin, Abrosimova G., Materials Letters 2017 Vol. 206 P. 64-66
To obtain a correct estimate of the microhardness dependence on the size of nanocrystals, the microhardness
of amorphous-nanocrystalline samples with the same fraction of the crystalline phase and the same
composition of the amorphous matrix but different sizes of nanocrystals was studied. It is shown that the
dependence of microhardness on the nanocrystal size in the size range ...
Added: February 22, 2018