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, Zili Zhou, Giulia Frucci, Giulia Frucci, Francesco Mattioli, Francesco Mattioli, Alessandro Gaggero, Alessandro Gaggero, Roberto Leoni, Roberto Leoni, Saedeeh Jahanmirinejad, Saedeeh Jahanmirinejad, Thang Ba Hoang, Thang Ba Hoang, Andrea Fiore, 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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