PT Journal
AU Korneev, A
   Kouminov, P
   Matvienko, V
   Chulkova, G
   Smirnov, K
   Voronov, B
   Gol'tsman, GN
   Currie, M
   Lo, W
   Wilsher, K
   Zhang, J
   Słysz, W
   Pearlman, A
   Verevkin, A
   Sobolewski, R
TI Sensitivity and gigahertz counting performance of NbN superconducting single-photon detectors
SO Appl. Phys. Lett.
JI Appl. Phys. Lett.
PY 2004
BP 5338
EP 5340
VL 84
IS 26
DI 10.1063/1.1764600
DE SSPD; NEP; QE
AB We have measured the quantum efficiencysQEd, GHz counting rate, jitter, and noise-equivalentpowersNEPdof nanostructured NbN superconducting single-photon detectorssSSPDsdin thevisible to infrared radiation range. Our 3.5-nm-thick and 100- to 200-nm-wide meander-typedevices(total area 10310mm2), operating at 4.2 K, exhibit an experimental QE of up to 20% inthe visible range and,10% at 1.3 to 1.55mm wavelength and are potentially sensitive up tomidinfrareds,10mmdradiation. The SSPD counting rate was measured to be above 2 GHz withjitter,18 ps, independent of the wavelength. The devices’ NEP varies from,10−17W/Hz1/2for1.55mm photons to,10−20W/Hz1/2for visible radiation. Lowering the SSPD operatingtemperature to 2.3 K significantly enhanced its performance, by increasing the QE to,20% andlowering the NEP level to,3310−22W/Hz1/2, both measured at 1.26mm wavelength.
ER