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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.


Verlagsausgabe §
DOI: 10.5445/IR/1000069542
Veröffentlicht am 09.05.2018
Originalveröffentlichung
DOI: 10.1364/OE.25.008739
Scopus
Zitationen: 14
Web of Science
Zitationen: 14
Dimensions
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Photonik und Quantenelektronik (IPQ)
Institut für Theoretische Festkörperphysik (TFP)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 1094-4087
urn:nbn:de:swb:90-695424
KITopen-ID: 1000069542
HGF-Programm 43.23.01 (POF III, LK 01) Advanced Optical Lithography+Microscopy
Erschienen in Optics express
Verlag The Optical Society of America (OSA)
Band 25
Heft 8
Seiten 8739-8750
Schlagwörter Photon counting, Infrared, Quantum detectors, Integrated optics, Multiphoton processes, Photon statistics
Nachgewiesen in Scopus
Web of Science
Dimensions
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