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Inderbitzin, K.; Engel, A.; Schilling, A.; Il'in, K.; Siegel, M. |
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An ultra-fast superconducting Nb nanowire single-photon detector for soft x-rays |
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2012 |
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Appl. Phys. Lett. |
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101 |
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SSPD, SNSPD, x-ray, Nb |
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Although superconducting nanowire single-photon detectors (SNSPDs) are well studied regarding the
detection of infrared/optical photons and keV-molecules, no studies on continuous x-ray photon
counting by thick-film detectors have been reported so far. We fabricated a 100 nm thick niobium
x-ray SNSPD (an X-SNSPD) and studied its detection capability of photons with keV-energies in
continuous mode. The detector is capable to detect photons even at reduced bias currents of 0.4%,
which is in sharp contrast to optical thin-film SNSPDs. No dark counts were recorded in extended
measurement periods. Strikingly, the signal amplitude distribution depends significantly on the photon
energy spectrum.VC |
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RPLAB @ seleznev @ |
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878 |
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Dorenbos, S. N.; Reiger, E. M.; Perinetti, U.; Zwiller, V.; Zijlstra, T.; Klapwijk, T. M. |
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Title |
Low noise superconducting single photon detectors on silicon |
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Journal Article |
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2008 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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93 |
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13 |
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131101 |
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0003-6951 |
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no |
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RPLAB @ s @ |
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436 |
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Mason, Whitney; Waterman, J. R. |
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Electrical and optical characteristics of two color mid wave HgCdTe infrared detectors |
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1999 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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74 |
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11 |
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1633-1635 |
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0003-6951 |
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RPLAB @ s @ |
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461 |
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Kardakova, A.; Finkel, M.; Morozov, D.; Kovalyuk, V.; An, P.; Dunscombe, C.; Tarkhov, M.; Mauskopf, P.; Klapwijk, T.M.; Goltsman, G. |
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The electron-phonon relaxation time in thin superconducting titanium nitride films |
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2013 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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103 |
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25 |
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252602 (1 to 4) |
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disordered TiN films, electron-phonon relaxation time |
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We report on the direct measurement of the electron-phonon relaxation time, τeph, in disordered TiN films. Measured values of τeph are from 5.5 ns to 88 ns in the 4.2 to 1.7 K temperature range and consistent with a T−3 temperature dependence. The electronic density of states at the Fermi level N0 is estimated from measured material parameters. The presented results confirm that thin TiN films are promising candidate-materials for ultrasensitive superconducting detectors.
The work was supported by the Ministry of Education and Science of the Russian Federation, Contract No. 14.B25.31.0007 and by the RFBR Grant No. 13-02-91159. |
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RPLAB @ kovalyuk @ |
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941 |
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Tretyakov, Ivan; Ryabchun, Sergey; Finkel, Matvey; Maslennikova, Anna; Kaurova, Natalia; Lobastova, Anastasia; Voronov, Boris; Gol'tsman, Gregory |
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Title |
Low noise and wide bandwidth of NbN hot-electron bolometer mixers |
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2011 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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98 |
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033507 (1 to 3) |
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NbN HEB mixer |
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We report a record double sideband noise temperature of 600 K (5hν/kB) offered by a NbN hot-electron bolometer receiver at 2.5 THz. Allowing for standing wave effects, this value was found to be constant in the intermediate frequency range 1–7 GHz, which indicates that the mixer has an unprecedentedly large noise bandwidth in excess of 7 GHz. The insight into this is provided by gain bandwidth measurements performed at the superconducting transition. They show that the dependence of the bandwidth on the mixer length follows the model for an HEB mixer with diffusion and phonon cooling of the hot electrons. |
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RPLAB @ gujma @ |
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638 |
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