29 May 2013 Multiphoton detection in superconducting nanowires: nonlinear optics in the detector
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A Nth-order (N=1, 2, 3, 4, 5, 6) interferometric autocorrelator based on superconducting nanodetectors is presented. It provides much higher sensitivity as compared to the conventional autocorrelators using all-optical nonlinearities and a temporal resolution of about 20 ps, which is limited by the quasi-particle energy relaxation time in the superconducting films. A semiclassical model is introduced to explain the nonlinear photodetection process. A comparison of sensitivity to conventional autocorrelators is also presented.
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Zili Zhou, Giulia Frucci, Francesco Mattioli, Alessandro Gaggero, Roberto Leoni, Saedeeh Jahanmirinejad, Thang Ba Hoang, Andrea Fiore, "Multiphoton detection in superconducting nanowires: nonlinear optics in the detector", Proc. SPIE 8727, Advanced Photon Counting Techniques VII, 87270B (29 May 2013); doi: 10.1117/12.2018849; https://doi.org/10.1117/12.2018849

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