TITLE

Sensitivity and gigahertz counting performance of NbN superconducting single-photon detectors

AUTHOR(S)
Korneev, A.; Kouminov, P.; Matvienko, V.; Chulkova, G.; Smirnov, K.; Voronov, B.; Gol'tsman, G. N.; Currie, M.; Lo, W.; Wilsher, K.; Zhang, J.; Slysz, W.; Pearlman, A.; Verevkin, A.; Sobolewski, Roman
PUB. DATE
June 2004
SOURCE
Applied Physics Letters;6/28/2004, Vol. 84 Issue 26, p5338
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have measured the quantum efficiency (QE), GHz counting rate, jitter, and noise-equivalent power (NEP) of nanostructured NbN superconducting single-photon detectors (SSPDs) in the visible to infrared radiation range. Our 3.5-nm-thick and 100- to 200-nm-wide meander-type devices (total area 10 × 10 μm2), operating at 4.2 K, exhibit an experimental QE of up to 20% in the visible range and ∼10% at 1.3 to 1.55 μm wavelength and are potentially sensitive up to midinfrared (∼10 μm) radiation. The SSPD counting rate was measured to be above 2 GHz with jitter <18 ps, independent of the wavelength. The devices' NEP varies from ∼10-17 W/Hz½ for 1.55 μm photons to ∼10-20W/Hz½ for visible radiation. Lowering the SSPD operating temperature to 2.3 K significantly enhanced its performance, by increasing the QE to ∼20% and lowering the NEP level to ∼3 × 10-22 W/Hz½, both measured at 1.26 μm wavelength.
ACCESSION #
13495704

 

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