A5028785165- Photonic and Optical Devices
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Advanced Optical Sensing Technologies
- Superconducting and THz Device Technology
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Spectroscopy and Laser Applications
- Diamond and Carbon-based Materials Research
- Material Properties and Applications
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Semiconductor Detectors and Materials
- Semiconductor Quantum Structures and Devices
- Analytical Chemistry and Sensors
- Surface Treatment and Coatings
- Optical Network Technologies
- Force Microscopy Techniques and Applications
- Metal Alloys Wear and Properties
- Engineering Diagnostics and Reliability
- Metal and Thin Film Mechanics
- Neural Networks and Reservoir Computing
- Cold Atom Physics and Bose-Einstein Condensates
- Optical Coatings and Gratings
St Petersburg University
2025
National Research University Higher School of Economics
2014-2024
Central Research Institute for Machine Building
2011-2024
Moscow State Institute of Electronics and Mathematics
2016-2024
Russian Academy of Sciences
2023
Moscow State Pedagogical University
2013-2022
A. N. Kosygin Moscow State Textile University
2022
Kharkiv Institute of Physics and Technology
2015-2021
Moscow Institute of Physics and Technology
2013-2019
Bauman Moscow State Technical University
2018-2019
With use of the travelling-wave geometry approach, integrated superconductor-nanophotonic devices based on silicon nitride nanophotonic waveguide with a superconducting NbN-nanowire suited top were fabricated. was operated as single-photon counting detector up to 92 % on-chip detection efficiency in coherent mode, serving highly sensitive IR heterodyne mixer spectral resolution (f/df) greater than 106 C-band at 1550 nm wavelength.
We report our studies on spectral sensitivity of meander-type, superconducting NbN thin-film single-photon detectors (SPDs), characterized by GHz counting rates visible and near-infrared photons negligible dark counts. Our SPDs exhibit experimentally determined quantum efficiencies ranging from ∼0.2% at the 1.55 μm wavelength to ∼70% 0.4 μm. Spectral dependences detection efficiency (DE) 3.0-μm-wavelength range are presented. The exponential character DE dependence wavelength, as well its...
We have measured the quantum efficiency (QE), GHz counting rate, jitter, and noise-equivalent power (NEP) of nanostructured NbN superconducting single-photon detectors (SSPDs) in visible to infrared radiation range. Our 3.5-nm-thick 100- 200-nm-wide meander-type devices (total area 10×10μm2), operating at 4.2K, exhibit an experimental QE up 20% range ∼10% 1.3 1.55μm wavelength are potentially sensitive midinfrared (∼10μm) radiation. The SSPD rate was be above 2GHz with jitter <18ps,...
Abstract Superconducting nanowire single-photon detectors (SNSPDs) provide high efficiency for detecting individual photons while keeping dark counts and timing jitter minimal. Besides superior detection performance over a broad optical bandwidth, compatibility with an integrated platform is crucial requirement applications in emerging quantum photonic technologies. Here we present SNSPDs embedded nanophotonic circuits which achieve internal efficiencies close to unity at 1550 nm wavelength....
Ultrafast single-photon detectors with high efficiency are of utmost importance for many applications in the context integrated quantum photonic circuits. Detectors based on superconductor nanowires attached to optical waveguides particularly appealing this purpose. However, their speed is limited because required absorption necessitates long deposited top waveguide. This enhances kinetic inductance and makes slow. Here, we solve problem by aligning nanowire, contrary usual choice,...
We demonstrate experimentally that single photon detection can be achieved in micron-wide NbN bridges, with widths ranging from 0.53 $\mu$m to 5.15 and for photon-wavelengths 408 nm 1550 nm. The microbridges are biased a dc current close the experimental critical current, which is estimated about 50 % of theoretically expected depairing current. These results offer an alternative standard superconducting single-photon detectors (SSPDs), based on nanometer scale nanowires implemented long...
We fabricated and characterised nanowire superconducting single-photon detectors (SSPDs) made of 4 nm thick amorphous Mo$_x$Si$_{1-x}$ films. At 1.7 K the best devices exhibit a detection efficiency up to 18% at 1.2 um wavelength unpolarised light, characteristic response time about 6 ns timing jitter 120 ps. The was studied in range from 650 2500 nm. wavelengths below 1200 these reach their maximum limited by photon absorption thin MoSi film.
We present an overview of the state-of-the-art NbN superconducting single-photon detectors (SSPDs). Our devices exhibit quantum efficiency (QE) up to 30% in near-infrared wavelength and 0.4% at 5 mum, with a dark-count rate that can be as low 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> s xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> . The SSPD structures integrated lambda/4 microcavities achieve QE 60% telecommunication,...
We demonstrate evidence of coherent magnetic flux tunneling through superconducting nanowires patterned in a thin highly disordered NbN film. The phenomenon is revealed as superposition states fully metallic loop with the nanowire acting an effective tunnel barrier for flux, and reproducibly observed different wires. achieved rings proves universality previously reported ${\mathrm{InO}}_{x}$. perform microwave spectroscopy study amplitude function wire width, compare experimental results...
We use external magnetic field to probe the detection mechanism of superconducting nanowire single photon detector. argue that hot belt model (which assumes partial suppression order parameter $\Delta$ across whole width after absorption photon) does not explain observed weak dependence count rate (PCR) for photons with $\lambda$=450 nm and noticeable {\it decrease} PCR (with increasing field) in some range currents wavelengths $\lambda$ =450-1200 nm. Found experimental results all studied...
The photon count rate (PCR) of superconducting single-photon detectors made ${\mathrm{Mo}}_{x}{\mathrm{Si}}_{1\text{\ensuremath{-}}x}$ films shaped as a 2-$\ensuremath{\mu}\mathrm{m}$-wide strip and 115-nm-wide meander line is studied experimentally function the dc biasing current at different values perpendicular magnetic field. For wide strip, crossover ${I}_{\mathrm{cross}}$ observed, below which PCR increases with an increasing field above it decreases. This behavior contrasts narrow...
The aim of the study was to evaluate effect impact coupling interval (CI) ventricular ectopic beats (VEB) on their hemodynamic properties. Methods . properties VEBs were studied using example parasystoles with typical manifestations. VEB manifestations (significant differences in CI, “multiplicity,” presence “fusion” QRS complexes) two female patients without structural heart abnormalities, each having more than 10000 monomorphic per day. research method involved measuring blood pressure...
Introduction. In general, the physiological response of tissues to external stresses is not linear in accordance with Hooke's law. Biological are known exhibit a nonlinear relationship between stress and strain, although origins this nonlinearity remain incompletely understood. literature, authors over years have proposed many forms σ-ε correspondence, but question still open. The aim study. article formalizes characteristics elastic properties soft biological tissues. Elastic behavior...
We have measured the ultrafast reset time of NbN superconducting single photon detectors (SSPDs) based on a design consisting N parallel stripes. Compared to standard SSPD identical active area, displays similar detection efficiency and kinetic inductance, which is divided by N2. For N=12, duration voltage pulse reduced nearly two orders magnitude down 200ps. The timing jitter associated with rising front only 16ps. These results open way efficient ultrahigh counting rate exceeding 1 GHz.
We investigate single- and multi-photon detection regimes of superconducting nanowire detectors embedded in silicon nitride nanophotonic circuits. At near-infrared wavelengths, simultaneous up to three photons is observed for 120 nm wide nanowires biased far from the critical current, while narrow below 100 provide efficient single photon detection. A theoretical model proposed determine different calculate corresponding internal quantum efficiency. The predicted saturation efficiency regime...
Thorough spectral study of the intrinsic single-photon detection efficiency in superconducting TaN and NbN nanowires with different widths shows that experimental cut-off at near-infrared wavelengths is most likely caused by local deficiency Cooper pairs available for current transport. For both materials reciprocal wavelength scales wire width whereas scaling factor quantitatively agrees hot-spot models. Comparison data vortex-assisted scenarios these models predict a stronger dependence on width.
The detection of individual photons by superconducting nanowire single-photon detectors is an inherently binary mechanism, revealing either their absence or presence while concealing spectral information.For multicolor imaging techniques, such as spectroscopy, fluorescence resonance energy transfer microscopy, and correlation wavelength discrimination essential mandates separation prior to detection.Here, we adopt approach borrowed from quantum photonic integration realize a compact scalable...
Abstract The paper reports progress on the design and development of niobium-nitride, superconducting single-photon detectors (SSPDs) for ultrafast counting near-infrared photons secure quantum communications. SSPDs operate in detection mode, based photon-induced hotspot formation subsequent appearance a transient resistive barrier across an ultrathin submicron-width stripe. devices are fabricated from 3.5 nm thick NbN films kept at cryogenic (liquid helium) temperatures inside cryostat....
We present our studies on the quantum efficiency (QE) and noise equivalent power (NEP) of latest-generation, nanostructured, superconducting, single-photon detectors (SSPDs) in wavelength range from 0.5 to 5.6 /spl mu/m, operated at temperatures 2.0- 4.2-K range. Our are designed as 4-nm-thick 100-nm-wide NbN meander-shaped stripes, patterned by electron-beam lithography cover a 10/spl times/10-/spl mu/m/sup 2/ active area. The best-achieved QE 2.0 K for 1.55-/spl mu/m photons is 17%,...
We present our studies on dark counts, observed as transient voltage pulses, in current-biased NbN superconducting single-photon detectors (SSPDs), well ultrathin (~4 nm), submicrometer-width (100 to 500 nm) nanobridges. The duration of these spontaneous pulses varied from 250 ps 5 ns, depending the device geometry, with longest large kinetic-inductance SSPD structures. Dark counts were measured while devices completely isolated (shielded by a metallic enclosure) outside world, temperature...
Abstract We perform measurements of the switching current distributions three w ≈ 120 nm wide, 4 thick NbN superconducting strips which are used for single-photon detectors. These much wider than diameter vortex cores, so they classified as quasi-two-dimensional (quasi-2D). discover evidence macroscopic quantum tunneling by observing saturation standard deviation at temperatures around 2 K. analyze our results using Kurkijärvi-Garg model and find that escape temperature also saturates low...