K. Ilin
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Architectural environment of the Khabarovsk Children's Railway Open
The subject of the article is the peculiarities of the formation of the architectural environment of children's railroads in the Far East. The object of the study is a children's railroad in Khabarovsk, belonging to the Far Eastern railroa…
Design and Comparison of Diamond‐ and Sapphire‐Based NbN KIDs for Fusion Plasma Polarimetric Diagnostics Open
Design and characterization measurements performed on kinetic inductance detectors (KIDs) produced on sapphire and polycrystalline diamond substrates are presented. Designed as part of a nuclear fusion polarimetric diagnostic, the foreseen…
Characterization Measurements of Sapphire and Diamond based KIDs for Polarimetric Plasma Diagnostics Open
In this work we present the study and characterization measurements of Kinetic Inductance Detectors prototypes based on NbN thin films on diamond and sapphire substrates. The detectors are polarization sensitive, have multi-pixel design an…
Wafer-level uniformity of atomic-layer-deposited niobium nitride thin films for quantum devices Open
Superconducting niobium nitride thin films are used for a variety of photon detectors, quantum devices, and superconducting electronics. Most of these applications require highly uniform films, for instance, when moving from single-pixel d…
View article: Superconducting nanowire single-photon detector with 3D-printed free-form microlenses
Superconducting nanowire single-photon detector with 3D-printed free-form microlenses Open
We present an approach to increase the effective light-receiving area of superconducting nanowire single-photon detectors (SNSPD) by free-form microlenses. These lenses are printed in situ on top of the sensitive detector areas using high-…
The effect of boundary conditions on the stability of two-dimensional flows in an annulus with permeable boundary Open
We consider the stability of two-dimensional viscous flows in an annulus with permeable boundary. In the basic flow, the velocity has nonzero azimuthal and radial components, and the direction of the radial flow can be from the inner cylin…
Local thermal fluctuations in current-carrying superconducting nanowires Open
We analyze the effect of different types of fluctuations in internal electron energy on the rates of dark and photon counts in straight current-carrying superconducting nanowires. Dark counts appear due to thermal fluctuations in statistic…
Electron energy relaxation in disordered superconducting NbN films Open
We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by \nmeans of magnetoconductance, and photoresponse, respectively, in a series of strongly disordered superconducting NbN films. T…
Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density of states suppression in ultrathin NbN films Open
Disorder has different profound effects on superconducting thin films. For a\nlarge variety of materials, increasing disorder reduces electronic screening\nwhich enhances electron-electron repulsion. These fermionic effects lead to a\nmech…
Spectral filtering with diffractive reflection gratings for fast superconducting detectors in the THz frequency range Open
In this work we describe the design process of a grating spectrometer with fast superconducting THz detectors based on Niobiumnitride. The main application is the use as a diagnostic tool for accelerator-based sources of THz radiation like…
Synchronous single-photon detection with GHz-gated superconducting nanowire detectors Open
We demonstrate a GHz-gated operation of superconducting nanowire single-photon detectors suitable for synchronous applications. In comparison with conventional dc-biased nanowire detectors, this method prevents the detector from latching a…
Drift, stabilizing and destabilizing for a Patlak-Keller-Segel system with the short-wavelength external signal Open
This article aims at exploring the short-wavelength stabilization and destabilization of the advection-diffusion systems formulated using the Patlak-Keller-Segel cross-diffusion. We study a model of the taxis partly driven by an external s…
Spectroscopic evidence for strong correlations between local resistance and superconducting gap in ultrathin NbN films Open
Disorder has different profound effects on superconducting thin films. For a large variety of materials, increasing disorder reduces electronic screening which enhances electron-electron repulsion. These fermionic effects lead to a mechani…
Magnetic-Field Enhancement of Performance of Superconducting Nanowire Single-Photon Detector Open
We present SNSPDs from NbN nanowires shaped \nafter square-spiral, that allows an increase not only in critical \ncurrents, but also an extension of spectral detection efficiencies \nby just applying an external magnetic field. Using negat…
Photon-number resolving SNSPD for quantum photonic integrated circuits on GaAs at 4.2K Open
Photon-number resolving (PNR) single-photon detectors are of interest for a wide range of applications in the emerging field of photon based quantum technologies. Especially photonic integrated circuits will pave the way for a high complex…
Timing jitter in photon detection by straight superconducting nanowires: Effect of magnetic field and photon flux Open
We studied the effect of the external magnetic field and photon flux on timing jitter in photon detection by straight superconducting NbN nanowires. At two wavelengths 800 and 1560 nm, statistical distribution in the appearance time of the…
Terahertz Transition-Edge Sensor With Kinetic-Inductance Amplifier at 4.2 K Open
Different terrestrial terahertz applications would benefit from large-format arrays, operating in compact and inexpensive cryocoolers at liquid helium temperature with sensitivity, limited by the 300-K background radiation only. A voltage-…
Energy of dendritic avalanches in thin-film superconductors Open
A method for calculating stored magnetic energy in a thin superconducting film based on quantitative magneto-optical imaging is developed. Energy and magnetic moment are determined with these calculations for full hysteresis loops in a thi…
Timing jitter in photon detection by straight superconducting nanowires: Effect of magnetic field and photon flux Open
We studied the effect of the external magnetic field and photon flux on timing jitter in photon detection by straight superconducting NbN nanowires. At two wavelengths 800 and 1560 nm, statistical distribution in the appearance time of the…
Proximity effect model of ultranarrow NbN strips Open
We show that narrow superconducting strips in superconducting (S) and normal\n(N) states are universally described by the model presenting them as lateral\nNSN proximity systems in which the superconducting central band is sandwiched\nbetw…
Enhancement of superconductivity in NbN nanowires by negative electron-beam lithography with positive resist Open
We performed comparative experimental investigation of superconducting NbN nanowires which were prepared by means of positive- and negative electron-beam lithography with the same positive tone Poly-methyl-methacrylate (PMMA) resist. We sh…
Superconducting fluctuations in a thin NbN film probed by the Hall effect Open
We present a comprehensive study of how superconducting fluctuations in the normal state contribute to the conductivity tensor in a thin (119 $\AA$) film of NbN. It is shown how these fluctuations drive a sign change in the Hall coefficien…
Single-Shot THz Spectroscopy for the Characterization of Single-Bunch Bursting CSR Open
An integrated array of narrow-band high-Tc YBa2Cu3O7-x (YBCO) detectors embedded in broad-band readout was developed for the future use at synchrotron light sources as a single-shot terahertz (THz) spectrometer. The detection system consis…
AlN-Buffered Superconducting NbN Nanowire Single-Photon Detector on GaAs Open
We investigated the suitability of AlN as a buffer layer for NbN superconducting nanowire single-photon detectors (SNSPDs) on GaAs. The NbN films with a thickness of 3.3 nm to 20 nm deposited onto GaAs substrates with AlN buffer layer, dem…
View article: Confinement of superconducting fluctuations due to emergent electronic inhomogeneities
Confinement of superconducting fluctuations due to emergent electronic inhomogeneities Open
The microscopic nature of an insulating state in the vicinity of a\nsuperconducting state, in the presence of disorder, is a hotly debated\nquestion. While the simplest scenario proposes that Coulomb interactions\ndestroy the Cooper pairs …
Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors Open
Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the st…
View article: Single-Shot Spectral Analysis of Synchrotron Radiation in THz Regime at ANKA
Single-Shot Spectral Analysis of Synchrotron Radiation in THz Regime at ANKA Open
Micro-bunching instabilities limit the longitudinal compression of bunches in an electron storage ring. They create substructures on the bunch profile of some hundred micrometer size leading to coherently emitted synchrotron radiation in t…