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Waveguide-integrated single- and multi-photon detection at telecom wavelengths using superconducting nanowires
Applied Physics Letters. 2015. Vol. 106. P. 151101-1-151101-5.
We investigate single- and multi-photon detection regimes of superconducting nanowire detectors embedded in silicon nitride nanophotonic circuits. At near-infrared wavelengths, simultaneous detection of up to three photons is observed for 120 nm wide nanowires biased far from the critical current, while narrow nanowires below 100 nm provide efficient single photon detection. A theoretical model is proposed to determine the different detection regimes and to calculate the corresponding internal quantum efficiency. The predicted saturation of the internal quantum efficiency in the single photon regime agrees well with plateau behavior observed at high bias currents.
Florya I. N., Korneeva Y. P., Sidorova M. V. et al., EPJ Web of Conferences 2015 Vol. 103 P. 10004
We have studied the mechanism of energy relaxation and resistive state formation after absorption of a single photon for different wavelengths and materials of single photon detectors. Our results are in good agrreement with the hot spot model. ...
Added: October 15, 2015
Smirnov K., Vachtomin Y., Divochiy A. et al., Applied Physics Express 2015 Vol. 8 No. 2 P. 022501-1-022501-4
We found that background radiation limits the dark count rates of superconducting single photon detectors coupled to standard single mode optical fibers to a minimum level when the source temperature of the photons is close to 300 K. We measured this level to be 103 cps, which was confirmed by a theoretical analysis of the ...
Added: October 15, 2015
Lobanov Y., Shcherbatenko M. L., Shurakov A. et al., Optics Letters 2014 Vol. 39 No. 6 P. 1429-1432
We report on the development of a highly sensitive optical receiver for heterodyne IR spectroscopy at the communication wavelength of 1.5 μm (200 THz) by use of a superconducting hot-electron bolometer. The results are important for the resolution of narrow spectral molecular lines in the near-IR range for the study of astronomical objects, as well ...
Added: February 24, 2016
Семенов А. В., Девятов И. А., Smirnov K. et al., Журнал радиоэлектроники 2011 № 11
We investigate contribution to the detectivity of superconducting radiation sensors, originated from a change in spectral functions of the absorber under influence of the absorbed power. For the absorber manufactured of dirty superconducting film we demonstrate that at low temperature the only cause of the change in spectral functions is the change of the order ...
Added: October 12, 2017
Sidorova M. V., Divochiy A. V., Vakhomin Y. B. et al., Journal of Nanophotonics 2015 Vol. 9 P. 093051-1-093051-7
This paper presents an ultrafast niobium nitride (NbN) superconducting single-photon detector (SSPD) with an active area of 3 × 3 μm^2 that offers better timing performance metrics than the previous SSPD with an active area of 7 × 7 μm^2. The improved SSPD demonstrates a record timing jitter (<25 ps), an ultrashort recovery time (<2 ...
Added: March 4, 2016
Vorobyov V. V., Kazakov A. Y., Soshenko V. V. et al., Optical Materials Express 2017 Vol. 7 No. 2 P. 513-526
Further development of quantum emitter based communication and sensing applications intrinsically depends on the availability of robust single-photon detectors. Here, we demonstrate a new generation of superconducting single-photon detectors specifically optimized for the 500-1100 nm wavelength range, which overlaps with the emission spectrum of many interesting solid-state atom-like systems, such as nitrogen-vacancy and silicon-vacancy centers ...
Added: February 22, 2017
Korneev A., Hubers H., Semenov A. et al., Physical Review B: Condensed Matter and Materials Physics 2014 Vol. 89
We have studied the influence of an externally applied magnetic field on the photon and dark count rates of meander-type niobium nitride superconducting nanowire single-photon detectors. Measurements have been performed at a temperature of 4.2 K, and magnetic fields up to 250 mT have been applied perpendicularly to the meander plane. While photon count rates ...
Added: March 2, 2015
Vasenko A.S., Kawabata S., Ozaeta A. et al., Journal of Magnetism and Magnetic Materials 2015 Vol. 383 P. 175-179
Ferromagnetic materials with exchange fields E_ex smaller or of the order of the superconducting gap Delta are important for applications of corresponding (s-wave) superconductor/ ferromagnet/ superconductor (SFS) junctions. Presently such materials are not known but there are several proposals how to create them. Small exchange fields are in principle difficult to detect. Based on our ...
Added: September 28, 2015
Ozhegov R., Gorshkov K. N., Vachtomin Y. B. et al., Springer, 2014
The development of terahertz imaging instruments for security systems is on the cutting edge of terahertz technology. We are developing a THz imaging system based on a superconducting integrated receiver (SIR). An SIR is a new type of heterodyne receiver based on an SIS mixer integrated with a flux-flow oscillator (FFO) and a harmonic mixer ...
Added: February 24, 2016
Trifonov A., Tong E., Blundell R. et al., IEEE Transactions on Applied Superconductivity 2015 Vol. 25 No. 3 P. 1-4
Using a microwave probe as a tool, we have performed experiments aimed at understanding the origin of the output-power fluctuations in hot-electron-bolometer (HEB) mixers. We use a probe frequency of 1.5 GHz. The microwave probe picks up impedance changes of the HEB, which are examined upon demodulation of the reflected wave outside the cryostat. This ...
Added: March 27, 2015
Kawabata S., Vasenko A.S., Ozaeta A. et al., Journal of Magnetism and Magnetic Materials 2015 Vol. 383 P. 157-161
We investigate electron cooling based on a clean normal-metal/spin-filter/superconductor junction. Due to the suppression of the Andreev reflection by the spin-filter effect, the cooling power of the system is found to be extremely higher than that for conventional normal-metal/nonmagnetic-insulator/superconductor coolers. Therefore we can extract large amount of heat from normal metals. Our results strongly indicate ...
Added: September 28, 2015
Yagovtsev V., Gusev N., Pugach N. et al., Superconductor Science and Technology 2021 Vol. 34 Article 025003
The magnetization in a superconductor induced due to the inverse proximity effect is
investigated in hybrid bilayers containing a superconductor and a ferromagnetic
insulator or a strongly spin-polarized ferromagnetic metal. The study is performed
within a quasiclassical Green function framework, wherein Usadel equations are solved
with boundary conditions appropriate for strongly spin-polarized ferromagnetic
materials. A comparison with recent experimental data ...
Added: December 7, 2020
Stepanov N., Skvortsov M. A., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 14 P. 144517-1-144517-16
We study the effect of superconducting fluctuations on the conductivity of metals at arbitrary temperatures T and impurity scattering rates τ−1. Using the standard diagrammatic technique but in the Keldysh representation, we derive the general expression for the fluctuation correction to the dc conductivity applicable for any space dimensionality and analyze it in the case of the film ...
Added: June 6, 2018
Andrew G. Semenov, Zaikin A., Kuzmin L., Physical Review B: Condensed Matter and Materials Physics 2012 Vol. 86 No. 14 P. 144529-1-144529-5
We argue that electron-electron interactions fundamentally restrict the penetration length of Cooper pairs into a diffusive normal metal from a superconductor. At low temperatures, this Cooper pair dephasing length remains finite and does not diverge. We evaluate the subgap conductance of hybrids in the presence of electron-electron interactions and demonstrate that this length Lϕ can ...
Added: February 9, 2015
Gayduchenko I., Kardakova A., Fedorov G. E. et al., Journal of Applied Physics 2015 Vol. 118 No. 19 P. 194303-1-194303-9
Demand for efficient terahertz radiation detectors resulted in intensive study of the asymmetric carbon nanostructures as a possible solution for that problem. It was maintained that photothermoelectric effect under certain conditions results in strong response of such devices to terahertz radiation even at room temperature. In this work, we investigate different mechanisms underlying the response ...
Added: February 19, 2016
Andrew G. Semenov, Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 91 No. 2 P. 024505-1-024505-10
We demonstrate that in sufficiently long diffusive superconducting-normal-superconducting (SNS) junctions dc Josephson current is exponentially suppressed by electron-electron interactions down to zero temperature. This suppression is caused by the effect of Cooper pair dephasing which occurs in the normal metal and defines a new fundamental length scale Lφ in the problem. This length is fully consistent with that derived ...
Added: March 11, 2015
Shurakov A., Lobanov Y., Goltsman G., Superconductor Science and Technology 2015 Vol. 29 No. 2 P. 023001
The discovery of hot-electron phenomena in a thin superconducting film in the last century was followed by numerous experimental studies of its appearance in different materials aiming for a better understanding of the phenomena and consequent implementation of terahertz detection systems for practical applications. In contrast to the competitors such as superconductor-insulator-superconductor tunnel junctions and ...
Added: February 19, 2016
Andrew G. Semenov, Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 No. 5 P. 054505-1-054505-10
We investigate the effect of interacting quantum phase slips on persistent current and its fluctuations in ultrathin superconducting nanowires and nanorings pierced by the external magnetic flux. We derive the effective action for these systems and map the original problem onto an effective sine-Gordon theory on torus. We evaluate both the flux dependent persistent current ...
Added: February 9, 2015
Семенов А. В., Девятов И. А., Третьяков И. В. et al., Журнал радиоэлектроники 2011 № 11
Nonlinear Ginzburg-Landau equation for dirty supercondicting 1D wire is derived in the limit of high magnetic field. ...
Added: October 12, 2017
Duarte E. C., Sardella E., Teixeira Saraiva T. et al., / Cornell University. Series cond-mat "arxiv.org". 2022. No. 2209.
The presence of magnetic fields and/or transport currents can cause penetration of vortices in superconductors. Their motion leads to dissipation and resistive state arises, which in turn strongly affects the performance of superconducting devices such as single-photon and single-electron detectors. Therefore, an understanding of the dissipation mechanisms in mesoscopic superconductors is not only of fundamental ...
Added: November 7, 2022
Arutyunov K., Sedov E., Golokolenov I. et al., Physics of the Solid State, Springer Nature Switzerland AG 2019 Vol. 61 No. 9 P. 1559-1562
High-quality aluminum films on GaAs substrates are studied experimentally. The critical temperature of superconductivity is found to increase markedly with decreasing the film thickness. The observed phenomenon is considered as a manifestation of the quantum confinement effect, which affects both the density of states and the electron–phonon interaction. ...
Added: September 14, 2019
Shcherbatenko M., Lobanov Y., Semenov A. V. et al., Optics Express 2016 Vol. 24 No. 26 P. 30474-30484
Here, we report on the successful operation of a NbN thin film superconducting nanowire single-photon detector (SNSPD) in a coherent mode (as a mixer) at the telecommunication wavelength of 1550 nm. Providing the local oscillator power of the order of a few picowatts, we were practically able to reach the quantum noise limited sensitivity. The ...
Added: February 2, 2017
Smirnov K., Вахтомин Ю. Б., Смирнов А. В. et al., Вестник Новосибирского государственного университета. Серия: Физика 2010 Т. 5 № 4 С. 63-67
This work presents the results of the development and fabrication of sensitive and ultrafast detectorsbased on thin film superconducting nanostructures: hot-electron bolometers (HEBs) and visible and infrared superconducting singe photon detectors (SSPDs). The main operational principles of the superconducting devices are presentedas well as the technology of fabrication of the detectors and their main types ...
Added: October 12, 2017
Shurakov A., Tong C., Grimes P. et al., IEEE Transactions on Terahertz Science and Technology 2015 No. 5(1) P. 81-84
Added: March 27, 2015