%0 Conference Proceedings
%T Middle-infrared ultrafast superconducting single photon detector
%A Gol’tsman, G.
%A Korneev, A.
%A Tarkhov, M.
%A Seleznev, V.
%A Divochiy, A.
%A Minaeva, O.
%A Kaurova, N.
%A Voronov, B.
%A Okunev, O.
%A Chulkova, G.
%A Milostnaya, I.
%A Smirnov, K.
%S 32nd IRMW / 15th ICTE
%D 2007
%F Goltsman_etal2007
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1246), last updated on Sun, 16 May 2021 12:41:02 -0500
%X We present the results of the research on quantum efficiency of the ultrathin-film superconducting single-photon detectors (SSPD) in the wavelength rage from 1 mum to 5.7 mum. Reduction of operation temperature to 1.6 K allowed us to measure quantum efficiency of ~1 % at 5.7 mum wavelength with the SSPD made from 4-nm-thick NbN film. In a pursuit of further performance improvement we endeavored SSPD fabricating from 4-nm-thick MoRe film as an alternative material. The MoRe film exhibited transition temperature of 7.7K, critical current density at 4.2 K temperature was 1.1times10 6 A/cm 2 , and diffusivity 1.73 cmVs. The single-photon response was observed with MoRe SSPD at 1.3 mum wavelength with quantum efficiency estimated to be 0.04%.
%K SSPD
%K SNSPD
%R 10.1109/ICIMW.2007.4516419
%U https://doi.org/10.1109/ICIMW.2007.4516419
%P 115-116