A5079771350- Advanced Optical Sensing Technologies
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Power Quality and Harmonics
- Electric Power Systems and Control
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Analytical Chemistry and Sensors
- Advanced Semiconductor Detectors and Materials
- Nanoplatforms for cancer theranostics
- Spectroscopy and Laser Applications
- Organic Electronics and Photovoltaics
- Railway Systems and Energy Efficiency
- Conducting polymers and applications
- Polymer Nanocomposite Synthesis and Irradiation
- Particle Accelerators and Free-Electron Lasers
- Thermal Radiation and Cooling Technologies
- Material Properties and Applications
- Particle accelerators and beam dynamics
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Mechanical and Optical Resonators
- Quantum Dots Synthesis And Properties
- Photodynamic Therapy Research Studies
- Multilevel Inverters and Converters
- Nanowire Synthesis and Applications
Moscow State Pedagogical University
2010-2024
Tver State Agricultural Academy
2021
Institute of Synthetic Polymeric Materials
2020
Novosibirsk State Technical University
2016-2019
St Petersburg University
2018
Karpov Institute of Physical Chemistry
2012-2016
Kurchatov Institute
2012-2013
Time resolution is one of the main characteristics single photon detectors besides quantum efficiency and dark count rate. We demonstrate here an ultrafast time-correlated counting (TCSPC) setup consisting a newly developed board SPC-150NX superconducting NbN detector with sensitive area 7 × μm. The combination delivers record instrument response function full width at half maximum 17.8 ps system ∼15% wavelength 1560 nm. A calculation root mean square value timing jitter for channels counts...
It was investigated the possibility of creating NbN superconducting single-photon detectors with saturated dependence quantum efficiency versus normalized bias current. shown that saturation increases for based on finer films a lower value Rs300/Rs20. The decreasing Rs300/Rs20 related to increasing influence corrections conductivity superconductors and, in its turn, electron diffusion coefficient. best samples has constant system effi-ciency 94% at Ib/Ic~0.8 and wavelength 1.31 mkm.
We demonstrate niobium nitride based superconducting single-photon detectors sensitive in the spectral range 452-2300 nm. The system performance was tested a real-life experiment with correlated photons generated by means of spontaneous parametric downconversion, where one photon visible and other infrared range. measured signal to noise ratio as high 4×104 our detection setting. A efficiency 64% at 1550 nm 15% 2300 observed.
Background: Titanium (Ti) implants are extensively used in reconstructive surgery and orthopedics. However, the intrinsic inertness of untreated Ti usually results insufficient osseointegration. In order to improve osteoconductivity properties implants, they coated with hierarchical microtopographic/nanotopographic coatings employing method molecular layering atomic layer deposition (ML-ALD). Results: The analysis fabricated nanostructured relief scanning electron microscopy, force...
We have found experimentally that the rise time of voltage pulse in NbN superconducting single photon detectors increases nonlinearly with increasing length detector L. The effect is connected dependence resistance Rn, which appears after absorption, on its kinetic inductance Lk and, hence, detector. This conclusion confirmed by our calculations framework two temperature model.
The use of improved fabrication technology, highly disordered NbN thin films, and intertwined section topology makes it possible to create high-performance photon-number-resolving superconducting single-photon detectors (PNR SSPDs) that are comparable conventional single-element SSPDs at the telecom range. developed four-section PNR SSPD has simultaneously an 86±3% system detection efficiency, 35 cps dark count rate, ∼2 ns dead time, maximum 90 ps jitter. An investigation SSPD’s efficiency...
We have developed the deposition technology of WSi thin films 4 to 9 nm thick with high temperature values superconducting transition (Tc~4 K). Based on deposed there were produced nanostructures indicative planar sizes ~100 nm, and research revealed that even nanoscale possess critical (Tc~3.3-3.7 K) which certifies quality homogeneity created. The first experiments creating single-photon detectors showed detectors' SDE (system detection efficiency) increasing bias current (I b) reaches a...
This Letter presents, to the best of our knowledge, a novel optical configuration for direct time-resolved measurements luminescence from singlet oxygen, both in solutions and cultured cells on photodynamic therapy. The system is based superconducting single-photon detector, coupled confocal scanner that modified near-infrared measurements. recording phosphorescence signal oxygen at 1270 nm has been done using time-correlated counting. performance verified by measuring generated...
We report on development of superconducting single-photon detectors (SSPD) with high intrinsic quantum efficiency in the wavelength range 1.31 – 3.3 μm. By optimization NbN film thickness and its compound, we managed to improve detection up Optimized devices showed efficiencies as 10% at mid-IR range.
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We investigate thermal properties of a NbN single-photon detector capable unit internal detection efficiency. Using an independent calibration the coupling losses we determine absolute optical power absorbed by film and, via resistive superconductor thermometry, resistance Z(T) in dependence temperature. In principle, this approach permits simultaneous measurement electron-phonon and phonon-escape contributions to energy relaxation, which our case is ambiguous for their similar temperature...
We used technology of making high-efficiency superconducting single-photon detectors as a basis for improvement photon-number-resolving devices. By adding optical cavity and using an improved NbN film, we enhanced previously reported system detection efficiency at telecom range such detectors. Our results show that implementation helps to develop four-section device with quantum over 50% 1.55 µm. Performed experimental studies detecting multi-photon pulses showed irregularities defining...
We researched the relation between deposition and ultra-thin VN films parameters. To conduct experimental study we varied substrate temperature, Ar N2 partial pressures rate. The allowed us to obtain with close bulk values transition temperatures implement such samples in order fabricate superconducting single-photon detectors.
We investigate dark counts in SNSPD with spatial resolution, using nanostrip-patterned devices 50 Ohm matched coplanar waveguide - tapers. found that the originate from one or several points along strip, which we call 'weak points'. originating different can have dependence of rate on temperature, such as point makes main contribution to at low just a minor even disappears higher temperature. explain this terms realizations random local environments Then tilt distribution supercurrent...
Abstract The directivity pattern of a powerful GPR has been studied in archeological works. methods used: return pulse measurements by passing compact underground object, multiple passages with changing antennas azimuth for estimating the horizontal directivity, use prolonged overhead object order to estimate spurious radiation into upper hemisphere.