Sensitivity and gigahertz counting performance of NbN superconducting single-pho

2020-02-15 00:06:18

10 mu counting jitter superconducting

责任者: Korneev, A.;Kouminov, P.;Matvienko, V.;Chulkova, G.;Smirnov, K.;Voronov, B.;Goltsman, G.N.;Currie, M.;Lo, W.;Wilsher, K.;Zhang, J.;Slysz, W.;Pearlman 单位: Dept. of Phys., Moscow State Pedagogical Univ., Russia 来源出处: Applied Physics Letters(Appl. Phys. Lett. (USA)),2004/06/28,84(26):5338-40 摘要: 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/Hz1/2 for 1.55 μm photons to ~10-20W/Hz1/2 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/Hz1/2, both measured at 1.26 μm wavelength 关键词: jitter;nanostructured materials;niobium compounds;photon counting;sensitivity;superconducting device noise;superconducting photodetectors;type II superconductors;sensitivity;gigahertz counting performance;quantum efficiency;GHz counting rate;jitter;noise equivalent power;nanostructured NbN superconducting single photon detectors;visible-infrared radiation;meander type devices;3.5 nm;100 to 200 nm;4.2 K;1.3 to 1.55 micron;10 micron;2.3 K;1.26 micron;NbN