| Records |
| Author |
Manova, N. N.; Simonov, N. O.; Korneeva, Y. P.; Korneev, A. A. |
| Title |
Developing of NbN films for superconducting microstrip single-photon detector |
Type |
Conference Article |
| Year |
2020 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
| Volume |
1695 |
Issue |
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Pages |
012116 (1 to 5) |
| Keywords |
NbN SSPD, SNSPD, NbN films |
| Abstract |
We optimized NbN films on a Si substrate with a buffer SiO2 layer to produce superconducting microstrip single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current. We varied thickness of films and observed the maximum QE saturation for device based on the thinner film with the lowest ratio RS300/RS20. |
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| ISSN |
1742-6588 |
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1786 |
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| Author |
Dryazgov, M.; Semenov, A.; Manova, N.; Korneeva, Y.; Korneev, A. |
| Title |
Modelling of normal domain evolution after single-photon absorption of a superconducting strip of micron width |
Type |
Conference Article |
| Year |
2020 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
| Volume |
1695 |
Issue |
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Pages |
012195 (1 to 4) |
| Keywords |
SSPD modelling, SNSPD |
| Abstract |
The present paper describes a modelling of normal domain evolution in superconducting strip of micron width using solving differential equations describing the temperature and current changes. The solving results are compared with experimental data. This comparison demonstrates the high accuracy of the model. In future, it is possible to employ this model for improvement of single photon detector based on micron-scale superconducting strips. |
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1742-6588 |
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1785 |
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| Author |
Korneev, A. A. |
| Title |
Superconducting NbN microstrip single-photon detectors |
Type |
Abstract |
| Year |
2021 |
Publication |
Proc. Quantum Optics and Photon Counting |
Abbreviated Journal |
Proc. Quantum Optics and Photon Counting |
| Volume |
11771 |
Issue |
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Pages |
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| Keywords |
NbN SSPD, SNSPD |
| Abstract |
Superconducting Single-Photon Detectors (SSPD) invented two decades ago have evolved to a mature technology and have become devices of choice in the advanced applications of quantum optics, such as quantum cryptography and optical quantum computing. In these applications SSPDs are coupled to single-mode fibers and feature almost unity detection efficiency, negligible dark counts, picosecond timing jitter and MHz photon count rate. Meanwhile, there are great many applications requiring coupling to multi-mode fibers or free space. ‘Classical’ SSPDs with 100-nm-wide superconducting strip and covering area of about 100 µm2 are not suitable for further scaling due to degradation of performance and low fabrication yield. Recently we have demonstrated single-photon counting in micron-wide superconducting bridges and strips. Here we present our approach to the realization of practical photon-counting detectors of large enough area to be efficiently coupled to multi-mode fibers or free space. The detector is either a meander or a spiral of 1-µm-wide strip covering an area of 50x50 µm2. Being operated at 1.7K temperature it demonstrates the saturated detection efficiency (i.e. limited by the absorption in the detector) up to 1550 nm wavelength, about 10 ns dead time and timing jitter in range 50-100 ps. |
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SPIE |
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Prochazka, I.; Štefaňák, M.; Sobolewski, R.; Gábris, A. |
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Quantum Optics and Photon Counting; SPIE Optics + Optoelectronics, 2021, Online Only |
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1784 |
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Akhmadishina, K. F.; Bobrinetskiy, I. I.; Komarov, I. A.; Malovichko, A. M.; Nevolin, V. K.; Fedorov, G. E.; Golovin, A. V.; Zalevskiy, A. O.; Aidarkhanov, R. D. |
| Title |
Fast-response biological sensors based on single-layer carbon nanotubes modified with specific aptamers |
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Journal Article |
| Year |
2015 |
Publication |
Semicond. |
Abbreviated Journal |
Semicond. |
| Volume |
49 |
Issue |
13 |
Pages |
1749-1753 |
| Keywords |
carbon nanotubes, CNT detectors |
| Abstract |
The possibility of the fabrication of a fast-response biological sensor based on a composite of single-layer carbon nanotubes and aptamers for the specific detection of proteins is shown. The effect of modification of the surface of the carbon nanotubes on the selectivity and sensitivity of the sensors is investigated. It is shown that carboxylated nanotubes have a better selectivity for detecting thrombin. |
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1063-7826 |
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1783 |
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Yang, Y.; Fedorov, G.; Shafranjuk, S. E.; Klapwijk, T. M.; Cooper, B. K.; Lewis, R. M.; Lobb, C. J.; Barbara, P. |
| Title |
Electronic transport and possible superconductivity at Van Hove singularities in carbon nanotubes |
Type |
Journal Article |
| Year |
2015 |
Publication |
Nano Lett. |
Abbreviated Journal |
Nano Lett. |
| Volume |
15 |
Issue |
12 |
Pages |
7859-7866 |
| Keywords |
carbon nanotubes, CNT, tunable superconductivity, van Hove singularities |
| Abstract |
Van Hove singularities (VHSs) are a hallmark of reduced dimensionality, leading to a divergent density of states in one and two dimensions and predictions of new electronic properties when the Fermi energy is close to these divergences. In carbon nanotubes, VHSs mark the onset of new subbands. They are elusive in standard electronic transport characterization measurements because they do not typically appear as notable features and therefore their effect on the nanotube conductance is largely unexplored. Here we report conductance measurements of carbon nanotubes where VHSs are clearly revealed by interference patterns of the electronic wave functions, showing both a sharp increase of quantum capacitance, and a sharp reduction of energy level spacing, consistent with an upsurge of density of states. At VHSs, we also measure an anomalous increase of conductance below a temperature of about 30 K. We argue that this transport feature is consistent with the formation of Cooper pairs in the nanotube. |
| Address |
Department of Physics, Georgetown University , Washington, District of Columbia 20057, United States |
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1530-6984 |
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PMID:26506109; Suuplementary info (attached to pdf) DOI: 10.1021/acs.nanolett.5b02564 |
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1782 |
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