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Kuznetsov, K. A.; Kornienko, V. V.; Vakhtomin, Y. B.; Pentin, I. V.; Smirnov, K. V.; Kitaeva, G. K. |
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Generation and detection of optical-terahertz biphotons via spontaneous parametric downconversion |
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2018 |
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Proc. ICLO |
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Proc. ICLO |
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303 |
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NbN HEB applications |
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We study spontaneous parametric downconversion (SPDC) in the strongly non-degenerate regime when the idler wave hits the terahertz range. By using the hot-electron bolometer, for the first time the SPDC-generated idler-wave photons were directly detected in the terahertz frequency range. Spectrum of corresponding signal photons was measured using standard technique by the CCD camera. Possible applications of correlated optical-terahertz biphotons are discussed. |
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International Conference Laser Optics |
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1806 |
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Zolotov, P. I.; Vakhtomin, Yu. B.; Divochiy, A. V.; Seleznev, V. A.; Smirnov, K. V. |
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Title |
Technology development of resonator-based structures for efficiency increasing of NBN detectors of IR single photons |
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Journal Article |
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2016 |
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Proc. 5th Int. Conf. Photonics and Information Optics |
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Proc. 5th Int. Conf. Photonics and Information Optics |
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115-116 |
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NbN SSPD |
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This paper presents a technology of fabrication of NbN superconductive single- photon detectors, using resonator structures. The main results are related to optimization of the process of NbN sputtering over substrate with metallic mirrors and SiO 2 /Si 3 N 4 layers /4 thick. Investigation of the quantum efficiency of fabricated devices at 1.6 K on 1.55 μm showed triple-magnified value compared to standard Si/NbN structures. |
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Russian |
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978-5-7262-2215-8 |
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http://fioconf.mephi.ru/files/2015/12/FIO2016-Sbornik.pdf Разработка технологии создания резонаторных структур для увеличения квантовой эффективности NBN детекторов ИК-фотонов |
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1811 |
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Smirnov, K.; Vachtomin, Y.; Divochiy, A.; Antipov, A.; Goltsman, G. |
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The limitation of noise equivalent power by background radiation for infrared superconducting single photon detectors coupled to standard single mode optical fibers |
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2015 |
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Rus. J. Radio Electron. |
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Rus. J. Radio Electron. |
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5 |
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NbN SSPD |
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We investigated the minimum level of the dark count rates and noise equivalent power of superconducting single photon detectors coupled to standard single mode optical fibers. We found that background radiation limits the minimum level of the dark count rates. We also proposed the effective method for reducing background radiation out of the required spectral range of the detector. Measured noise equivalent power of detector reaches 8.9×10-19 W×Hz1/2 at a wavelength of 1.55 μm and quantum efficiency 35%. |
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14 pages |
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1813 |
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Semenov, A. V.; Devyatov, I. A.; Korneev, A. A.; Smirnov, K. V.; Goltsman, G. N.; Melnikov, A. P. |
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Derivation of expression for thermodynamic potential of “dirty” superconductor |
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2012 |
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Rus. J. Radio Electron. |
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Rus. J. Radio Electron. |
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4 |
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dirty superconductor, Usadel theory, thermodynamic potential |
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We derive a formula for thermodynamic potential of dirty superconductor which express it via isotropic quasiclassical Green functions of Usadel theory. Our result allows unify description of dynamic processes and fluctuations in superconducting nano-electronic devices. |
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7 pages |
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1824 |
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Korneeva, Yu. P.; Trifonov, A. V.; Vakhtomin, Yu. B.; Smirnov, K. V. |
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Design of resonator for superconducting single-photon detector |
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2011 |
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Rus. J. Radio Electron. |
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Rus. J. Radio Electron. |
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12 |
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SSPD optical resonator, SNSPD |
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A resonator for superconducting single-photon detector is designed. Near 60% coupling with a radiation propagating from a dielectric substrate of optical fiber is demonstrated to be achieved for typical values of the detector’s film sheet resistance. |
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6 pages |
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1827 |
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