TY  - JOUR
AU  - Sobolewski, R.
AU  - Verevkin, A.
AU  - Gol'tsman, G. N.
AU  - Lipatov, A.
AU  - Wilsher, K.
PY  - 2003
DA  - 2003//
TI  - Ultrafast superconducting single-photon optical detectors and their applications
JO  - IEEE Trans. Appl. Supercond.
SP  - 1151
EP  - 1157
VL  - 13
IS  - 2
KW  - NbN SSPD
KW  - SNSPD
AB  - We present a new class of ultrafast single-photon detectors for counting both visible and infrared photons. The detection mechanism is based on photon-induced hotspot formation, which forces the supercurrent redistribution and leads to the appearance of a transient resistive barrier across an ultrathin, submicrometer-width, superconducting stripe. The devices were fabricated from 3.5-nm- and 10-nm-thick NbN films, patterned into <200-nm-wide stripes in the 4 /spl times/ 4-/spl mu/m/sup 2/ or 10 /spl times/ 10-/spl mu/m/sup 2/ meander-type geometry, and operated at 4.2 K, well below the NbN critical temperature (T/sub c/=10-11 K). Continuous-wave and pulsed-laser optical sources in the 400-nm-to 3500-nm-wavelength range were used to determine the detector performance in the photon-counting mode. Experimental quantum efficiency was found to exponentially depend on the photon wavelength, and for our best, 3.5-nm-thick, 100-/spl mu/m/sup 2/-area devices varied from >10% for 405-nm radiation to 3.5% for 1550-nm photons. The detector response time and jitter were /spl sim/100 ps and 35 ps, respectively, and were acquisition system limited. The dark counts were below 0.01 per second at optimal biasing. In terms of the counting rate, jitter, and dark counts, the NbN single-photon detectors significantly outperform their semiconductor counterparts. Already-identified applications for our devices range from noncontact testing of semiconductor CMOS VLSI circuits to free-space quantum cryptography and communications.
SN  - 1051-8223
UR  - https://ieeexplore.ieee.org/document/1211810
UR  - https://doi.org/10.1109/TASC.2003.814178
DO  - 10.1109/TASC.2003.814178
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=509), last updated on Thu, 20 May 2021 19:17:01 -0500
ID  - Sobolewski_etal2003
ER  -