TY  - CONF
AU  - Zhang, J.
AU  - Verevkin, A.
AU  - Slysz, W.
AU  - Chulkova, G.
AU  - Korneev, A.
AU  - Lipatov, A.
AU  - Okunev, O.
AU  - Gol’tsman, G. N.
AU  - Sobolewski, Roman
A2  - Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 2002, Ottawa, Ontario, Canada
ED  - Armitage, J. C.
PY  - 2017
DA  - 2017//
TI  - Time-resolved characterization of NbN superconducting single-photon optical detectors
T2  - Proc. SPIE
BT  - Proc. SPIE
SP  - 103130F (1 to 3)
VL  - 10313
PB  - SPIE
KW  - NbN SSPD
KW  - SNSPD
AB  - NbN superconducting single-photon detectors (SSPDs) are very promising devices for their picosecond response time, high intrinsic quantum efficiency, and high signal-to-noise ratio within the radiation wavelength from ultraviolet to near infrared (0.4 gm to 3 gm) [1-3]. The single photon counting property of NbN SSPDs have been investigated thoroughly and a model of hotspot formation has been introduced to explain the physics of the photon- counting mechanism [4-6]. At high incident flux density (many-photon pulses), there are, of course, a large number of hotspots simultaneously formed in the superconducting stripe. If these hotspots overlap with each other across the width w of the stripe, a resistive barrier is formed instantly and a voltage signal can be generated. We assume here that the stripe thickness d is less than the electron diffusion length, so the hotspot region can be considered uniform. On the other hand, when the photon flux is so low that on average only one hotspot is formed across w at a given time, the formation of the resistive barrier will be realized only when the supercurrent at sidewalks surpasses the critical current (jr) of the superconducting stripe [1]. In the latter situation, the formation of the resistive barrier is associated with the phase-slip center (PSC) development. The effect of PSCs on the suppression of superconductivity in nanowires has been discussed very recently [8, 9] and is the subject of great interest.
UR  - https://doi.org/10.1117/12.2283811
DO  - 10.1117/12.2283811
N1  - Downloaded from http://www2.ece.rochester.edu/projects/ufqp/PDF/2002/213_NbNTime_OPTO_b.pdf This artcle was published in 2017 with only first author indicated (Zhang, J.). There were 8 more authors!
ID  - Zhang_etal2017
ER  -