| Records |
| Author |
Korneeva, Y.; Florya, I.; Vdovichev, S.; Moshkova, M.; Simonov, N.; Kaurova, N.; Korneev, A.; Goltsman, G. |
| Title |
Comparison of hot spot formation in nbn and mon thin superconducting films after photon absorption |
Type |
Journal Article |
| Year |
2017 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
Volume  |
27 |
Issue |
4 |
Pages |
1-4 |
| Keywords |
MoNx SSPD |
| Abstract |
In superconducting single-photon detectors (SSPD), the efficiency of local suppression of superconductivity and hotspot formation is controlled by diffusivity and electron-phonon interaction time. Here, we selected a material, 3.6-nm-thick MoNx film, which features diffusivity close to those of NbN traditionally used for SSPD fabrication, but with electron-phonon interaction time an order of magnitude larger. In MoN ∞ detectors, we study the dependence of detection efficiency on bias current, photon energy, and strip width, and compare it with NbN SSPD. We observe nonlinear current-energy dependence in MoNx SSPD and more pronounced plateaus in dependences of detection efficiency on bias current, which we attribute to longer electron-phonon interaction time. |
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1051-8223 |
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1325 |
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| Author |
Korneev, A.; Korneeva, Y.; Florya, I.; Semenov, A.; Goltsman, G. |
| Title |
Photon switching statistics in multistrip superconducting single-photon detectors |
Type |
Journal Article |
| Year |
2018 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
| Volume |
28 |
Issue |
7 |
Pages |
1-4 |
| Keywords |
SSPD, SNSPD |
| Abstract |
We study photon count statistics in superconducting single-photon detectors consisting of up to 70 narrow superconducting strips connected in parallel. Using interarrival time analysis, we demonstrate that our samples are operated in the “arm-trigger” regime and require up to seven subsequently absorbed photons to form a resistive state in the whole sample. We also performed numerical simulation of the light and dark count rates versus detector bias current, which are in good agreement with the experimental results. |
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1051-8223 |
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no |
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1304 |
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Korneeva, Y. P.; Manova, N. N.; Dryazgov, M. A.; Simonov, N. O.; Zolotov, P. I.; Korneev, A. A. |
| Title |
Influence of sheet resistance and strip width on the detection efficiency saturation in micron-wide superconducting strips and large-area meanders |
Type |
Journal Article |
| Year |
2021 |
Publication |
Supercond. Sci. Technol. |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
34 |
Issue |
8 |
Pages |
084001 |
| Keywords |
NbN SSPD, SMSPD |
| Abstract |
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 1.7 K temperature DE saturation can be clearly observed at 1550 nm wavelength in strip with the width up to 2 μm when sheet resistance of the film is above 630Ω/sq. In such strips the length of the saturation plateau almost does not depend on the strip width. We used these films to make meander-shaped detectors with the light sensitive area from 20×20μm2 to a circle 50 μm in diameter. In the latter case, the detector with the strip width of 0.49 μm demonstrates saturation of DE up to 1064 nm wavelength. Although DE at 1310 and 1550 nm is not saturated, it is as high as 60%. The response time is limited by the kinetic inductance and equals to 20 ns(by 1/e decay), timing jitter is 44 ps. When coupled to multi-mode fibre large-area meanders demonstrate significantly higher dark count rate which we attribute to thermal background photons, thus advanced filtering technique would be required for practical applications. |
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0953-2048 |
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1793 |
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Korneev, A.; Minaeva, O.; Rubtsova, I.; Milostnaya, I.; Chulkova, G.; Voronov, B.; Smirnov, K.; Seleznev, V.; Gol'tsman, G.; Pearlman, A.; Slysz, W.; Cross, A.; Alvarez, P.; Verevkin, A.; Sobolewski, R. |
| Title |
Superconducting single-photon ultrathin NbN film detector |
Type |
Journal Article |
| Year |
2005 |
Publication |
Quantum Electronics |
Abbreviated Journal |
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| Volume |
35 |
Issue |
8 |
Pages |
698-700 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
Superconducting single-photon ultrathin NbN film detectors are studied. The development of manufacturing technology of detectors and the reduction of their operating temperature down to 2 K resulted in a considerable increase in their quantum efficiency, which reached in the visible region (at 0.56 μm) 30%—40%, i.e., achieved the limit determined by the absorption coefficient of the film. The quantum efficiency exponentially decreases with increasing wavelength, being equal to ~20% at 1.55 μm and ~0.02% at 5 μm. For the dark count rate of ~10-4s-1, the experimental equivalent noise power was 1.5×10-20 W Hz-1/2; it can be decreased in the future down to the record low value of 5×10-21 W Hz-1/2. The time resolution of the detector is 30 ps. |
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Сверхпроводящий однофотонный детектор на основе ультратонкой пленки NbN |
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383 |
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Korneev, A.; Korneeva, Y.; Florya, I.; Voronov, B.; Goltsman, G. |
| Title |
NbN nanowire superconducting single-photon detector for mid-infrared |
Type |
Journal Article |
| Year |
2012 |
Publication |
Phys. Procedia |
Abbreviated Journal |
Phys. Procedia |
| Volume |
36 |
Issue |
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Pages |
72-76 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
Superconducting single-photon detectors (SSPD) is typically 100 nm-wide supercondiucting strip in a shape of meander made of 4-nm-thick film. To reduce response time and increase voltage response a parallel connection of the strips was proposed. Recently we demonstrated that reduction of the strip width improves the quantum effciency of such a detector at wavelengths longer than 1.5 μm. Being encourage by this progress in quantum effciency we improved the fabrication process and made parallel-wire SSPD with 40-nm-wide strips covering total area of 10 μm x 10 μm. In this paper we present the results of the characterization of such a parallel-wire SSPD at 10.6 μm wavelength and demonstrate linear dependence of the count rate on the light power as it should be in case of single-photon response. |
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1875-3892 |
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1382 |
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