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Author |
Teich, M. C. |
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Title |
Chapter 9. Coherent detection in the infrared |
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Book Chapter |
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Year |
1970 |
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361-407 |
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minimum detectable power, photon counter, photon counting, quantum counting, quantum limit |
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Academic Press Inc. |
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NY |
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Semiconductors and semimetals |
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5 |
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1059 |
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Author |
Driessen, E. F. C.; Braakman, F. R.; Reiger, E. M.; Dorenbos, S. N.; Zwiller, V.; de Dood, M. J. A. |
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Title |
Impedance model for the polarization-dependent optical absorption of superconducting single-photon detectors |
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Journal Article |
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Year |
2009 |
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Eur. Phys. J. Appl. Phys. |
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47 |
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10701 |
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Keywords |
SSPD, SNSPD |
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Abstract |
We measured the single-photon detection efficiency of NbN superconducting single-photon detectors as a function of the polarization state of the incident light for different wavelengths in the range from 488 nm to 1550 nm. The polarization contrast varies from ~% at 488 nm to~0% at 1550 nm, in good agreement with numerical calculations. We use an optical-impedance model to describe the absorption for polarization parallel to the wires of the detector. For the extremely lossy NbN material, the absorption can be kept constant by keeping the product of layer thickness and filling factor constant. As a consequence, the maximum possible absorption is independent of filling factor. By illuminating the detector through the substrate, an absorption efficiency of ~0% can be reached for a detector on Si or GaAs, without the need for an optical cavity. |
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English |
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RPLAB @ alex_kazakov @ |
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1062 |
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Author |
Тархов, Михаил Александрович |
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Title |
Разработка сверхпроводниковых однофотонных детекторов с повышенной спектральной чувствительностью и быстродействием |
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Manuscript |
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Year |
2016 |
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М. НИЦ “Курчатовский институт” |
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1-103 |
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SSPD |
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123182, Россия, Москва, пл. Академика И. В. Курчатова, 1 |
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Ph.D. thesis |
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НИЦ "Курчатовский институт" |
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1064 |
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Author |
Тархов, Михаил Александрович |
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Title |
Разработка сверхпроводниковых однофотонных детекторов с повышенной спектральной чувствительностью и быстродействием. Автореферат |
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2016 |
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М. НИЦ “Курчатовский институт” |
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1-30 |
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SSPD |
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1065 |
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Author |
Amundsen, Morten; Linder, Jacob |
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General solution of 2D and 3D superconducting quasiclassical systems: coalescing vortices and nanodisk geometries |
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2015 |
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arXiv:1512.00030 [cond-mat.supr-con] |
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quasiclassical Usadel equation, finite elements method |
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In quasiclassical Keldysh theory, the Green function matrix g<cb><2021> is used to compute a variety of physical quantities in mesoscopic systems. However, solving the set of non-linear differential equations that provide g<cb><2021> becomes a challenging task when going to higher spatial dimensions than one. Such an extension is crucial in order to describe physical phenomena like charge/spin Hall effects and topological excitations like vortices and skyrmions, none of which can be captured in one-dimensional models. We here present a numerical finite element method which solves the 2D and 3D quasiclassical Usadel equation, without any linearisation, relevant for the diffusive regime. We show the application of this on two model systems with non-trivial geometries: (i) a bottlenecked Josephson junction with external flux and (ii) a nanodisk ferromagnet deposited on top of a superconductor. We demonstrate that it is possible to control externally not only the geometrical array in which superconducting vortices arrange themselves, but also to cause coalescence and thus tune the number of vortices. The finite element method presented herein could pave the way for gaining insight in physical phenomena which so far have remained largely unexplored due to the complexity of solving the full quasiclassical equations in higher dimensions. |
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1066 |
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