Time delay of resistive-state formation in superconducting stripes excited by single optical photons

J. Zhang, W. Słysz, A. Pearlman, A. Verevkin, Roman Sobolewski, O. Okunev, G. Chulkova, and G. N. Gol’tsman
Phys. Rev. B 67, 132508 – Published 28 April 2003
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Abstract

We have observed a 65(±5)-ps time delay in the onset of a resistive-state formation in 10-nm-thick, 130-nm-wide NbN superconducting stripes exposed to single photons. The delay in the photoresponse decreased to zero when the stripe was irradiated by multi-photon (classical) optical pulses. Our NbN structures were kept at 4.2 K, well below the material’s critical temperature, and were illuminated by 100-fs-wide optical pulses. The time-delay phenomenon has been explained within the framework of a model based on photon-induced generation of a hotspot in the superconducting stripe and subsequent, supercurrent-assisted, resistive-state formation across the entire stripe cross section. The measured time delays in both the single-photon and two-photon detection regimes agree well with theoretical predictions of the resistive-state dynamics in one-dimensional superconducting stripes.

  • Received 5 August 2002

DOI:https://doi.org/10.1103/PhysRevB.67.132508

©2003 American Physical Society

Authors & Affiliations

J. Zhang*, W. Słysz, A. Pearlman, A. Verevkin, and Roman Sobolewski

  • Department of Electrical and Computer Engineering and Laboratory of Laser Energetics, University of Rochester, Rochester, New York 14627-0231

O. Okunev, G. Chulkova, and G. N. Gol’tsman

  • Department of Physics, Moscow State Pedagogical University, Moscow 119435, Russia

  • *Corresponding author. Email address: jinzhan@ece.rochester.edu; also at the Materials Science Program, University of Rochester, Rochester, New York 14627.
  • Also at the Institute of Electron Technology, PL-02668 Warszawa, Poland.
  • Also at the Institute of Physics, Polish Academy of Sciences, PL-02668 Warszawa, Poland.

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Vol. 67, Iss. 13 — 1 April 2003

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