TY  - JOUR
AU  - Gol’tsman, G. N.
AU  - Okunev, O.
AU  - Chulkova, G.
AU  - Lipatov, A.
AU  - Semenov, A.
AU  - Smirnov, K.
AU  - Voronov, B.
AU  - Dzardanov, A.
AU  - Williams, C.
AU  - Sobolewski, R.
PY  - 2001
DA  - 2001//
TI  - Picosecond superconducting single-photon optical detector
T2  - Appl. Phys. Lett.
JO  - Appl. Phys. Lett.
SP  - 705
EP  - 707
VL  - 79
IS  - 6
KW  - NbN SSPD
KW  - SNSPD
AB  - We experimentally demonstrate a supercurrent-assisted, hotspot-formation mechanism for ultrafast detection and counting of visible and infrared photons. A photon-induced hotspot leads to a temporary formation of a resistive barrier across the superconducting sensor strip and results in an easily measurable voltage pulse. Subsequent hotspot healing in ∼30 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. Our device consists of an ultrathin, very narrow NbN strip, maintained at 4.2 K and current-biased close to the critical current. It exhibits an experimentally measured quantum efficiency of ∼20% for 0.81 μm wavelength photons and negligible dark counts.
SN  - 0003-6951
UR  - http://aip.scitation.org/doi/10.1063/1.1388868
UR  - https://doi.org/10.1063/1.1388868
DO  - 10.1063/1.1388868
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1543), last updated on Mon, 24 May 2021 13:30:03 -0500
ID  - Goltsman_etal2001
ER  -