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Dauler, E. A.; Kerman, A. J.; Robinson, B. S.; Yang, J. K. W.; Voronov, B. M.; Gol’tsman, G. N.; Berggren, K. K. |
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Achieving high counting rates in superconducting nanowire single-photon detectors |
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Conference Article |
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2006 |
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CLEO/QELS |
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CLEO/QELS |
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JTuD3 (1 to 2) |
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SSPD; SNSPD; Detectors; Photodetectors; Quantum optics; Quantum detectors; Photon counting; Photons; Pulse shaping; Quantum communications; Single photon detectors; Superconductors |
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Kinetic inductance is determined to be the primary limitation to the counting rate of superconducting nanowire single-photon counters. Approaches for overcoming this limitation will be discussed. |
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Optical Society of America |
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Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies |
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1451 |
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Rosfjord, K. M.; Yang, J. K. W.; Dauler, E. A.; Anant, V.; Berggren, K. K.; Kerman, A. J.; Voronov, B. M.; Gol’tsman, G. N. |
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Title |
Increased detection efficiencies of nanowire single-photon detectors by integration of an optical cavity and anti-reflection coating |
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Conference Article |
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2006 |
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CLEO/QELS |
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CLEO/QELS |
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JTuF2 (1 to 2) |
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SSPD, SNSPD |
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We fabricate and test superconducting NbN-nanowire single-photon detectors with an integrated optical cavity and anti-reflection coating. We design the cavity and coating such as to maximize absorption in the NbN film of the detector. |
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2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference |
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1452 |
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McDonald, P.C.; Jaramillo, E.; Baudouy, B. |
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Thermal design of the CFRP support struts for the spatial framework of the Herschel Space Observatory |
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Journal Article |
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2006 |
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Cryogenics |
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Cryogenics |
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46 |
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4 |
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298-304 |
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0011-2275 |
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RPLAB @ s @ |
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442 |
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Jiang, Ling; Miao, Wei; Zhang, Wen; Li, Ning; Lin, Zhen Hui; Yao, Qi Jun; Shi, Sheng-Cai; Svechnikov, S. I.; Vakhtomin, Y. B.; Antipov, S. V.; Voronov, B. M.; Kaurova, N. S.; Gol'tsman, G. N. |
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Characterization of a quasi-optical NbN superconducting HEB mixer |
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2006 |
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IEEE Trans. Microwave Theory Techn. |
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IEEE Trans. Microwave Theory Techn. |
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54 |
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7 |
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2944-2948 |
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NbN HEB mixers |
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In this paper, the performance of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer, cryogenically cooled by a close-cycled 4-K refrigerator, is thoroughly investigated at 300, 500, and 850 GHz. The lowest receiver noise temperatures measured at the respective three frequencies are 1400, 900, and 1350 K, which can go down to 659, 413, and 529 K, respectively, after correcting the loss and associated noise contribution of the quasi-optical system before the measured superconducting HEB mixer. The stability of the quasi-optical superconducting HEB mixer is also investigated here. The Allan variance time measured with a local oscillator pumping at 500 GHz and an IF bandwidth of 110 MHz is 1.5 s at the dc-bias voltage exhibiting the lowest noise temperature and increases to 2.5 s at a dc bias twice that voltage. |
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0018-9480 |
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1448 |
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Baselmans, J. J. A.; Baryshev, A.; Reker, S. F.; Hajenius, M.; Gao, J. R.; Klapwijk, T. M.; Voronov, B.; Gol’tsman, G. |
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Influence of the direct response on the heterodyne sensitivity of hot electron bolometer mixers |
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Journal Article |
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2006 |
Publication |
J. Appl. Phys. |
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J. Appl. Phys. |
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100 |
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8 |
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084510 (1 to 7) |
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Keywords |
NbN HEB mixers |
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We present a detailed experimental study of the direct detection effect in a small volume (0.15μm×1μm×3.5nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 673GHz. We find that the small signal noise temperature, relevant for an astronomical observation, is 20% lower than the noise temperature obtained using 300 and 77K calibration loads. In a separate set of experiments we show that the direct detection effect is caused by a combination of bias current reduction when switching from the 77 to the 300K
load in combination with the bias current dependence of the receiver gain. The bias current dependence of the receiver gain is shown to be mainly caused by the current dependence of the mixer gain. |
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0021-8979 |
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1442 |
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