Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Quantum Optics and Photonics III
Q 53.2: Talk
Thursday, March 8, 2018, 10:45–11:00, K 0.016
Hot-spot relaxation time current dependence in niobium nitride waveguide-integrated superconducting nanowire single-photon detectors — •Simone Ferrari1, Vadim Kovalyuk2, Gregory Gol'tsman2, and Wolfram Pernice1 — 1University of Münster, Institute of Physics, Germany — 2Moscow State Pedagogical University, Department of Physics, Russia
Superconducting nanowires detectors embedded in nanophotonic circuitry provide an attractive solution for on-chip fast and efficient single-photon detection. Their working principle is based on the localized destruction of superconductivity, called hot-spot, after the absorption of a photon, which generates a recordable electrical pulse. To investigate the ultimate detection timescale for these devices, we adopt a pump-probe technique in the near-infrared region [1,2]. We study the bias current dependence of the hot-spot temporal dynamic for niobium-nitride superconducting nanowire single photon detectors atop silicon nitride waveguides. Our study reveals a strong increase of the picosecond relaxation time with increasing bias current. A minimum relaxation time of 22 ps is obtained when applying a bias current of 50% of the switching current at a bath temperature of 1.7K. [1] Phys. Rev. B 93, 094518 (2016) [2] Optics Express 25 (8), 8739 (2017)