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Verlagsausgabe
DOI: 10.5445/IR/1000069542
Veröffentlicht am 09.05.2018
Originalveröffentlichung
DOI: 10.1364/OE.25.008739
Scopus
Zitationen: 2
Web of Science
Zitationen: 2

Hot-spot relaxation time current dependence in niobium nitride waveguide-integrated superconducting nanowire single-photon detectors

Ferrari, Simone; Kovalyuk, Vadim; Hartmann, Wladislaw; Vetter, Andreas; Kahl, Oliver; Lee, Changhyoup; Korneev, Alexander; Rockstuhl, Carsten; Gol’tsman, Gregory; Pernice, Wolfram

Abstract:
We investigate how the bias current affects the hot-spot relaxation dynamics in niobium nitride. We use for this purpose a near-infrared pump-probe technique on a waveguide-integrated superconducting nanowire single-photon detector driven in the twophoton regime. We observe a strong increase in the picosecond relaxation time for higher bias currents. A minimum relaxation time of (22 ± 1) ps is obtained when applying a bias current of 50% of the switching current at 1.7 K bath temperature. We also propose a practical approach to accurately estimate the photon detection regimes based on the reconstruction of the measured detector tomography at different bias currents and for different illumination conditions.


Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Institut für Photonik und Quantenelektronik (IPQ)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1094-4087
URN: urn:nbn:de:swb:90-695424
KITopen ID: 1000069542
HGF-Programm 43.23.01; LK 01
Erschienen in Optics express
Band 25
Heft 8
Seiten 8739-8750
Schlagworte Photon counting, Infrared, Quantum detectors, Integrated optics, Multiphoton processes, Photon statistics
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