Jelmer Renema, Giulia Frucci, Zili Zhou, Francesco Mattioli, Allesandro Gaggero, Roberto Leoni, Michiel J. A. de Dood, Andrea Fiore, Martin P. van Exter
Using detector tomography, we demonstrate that the detection mechanism in NbN-based superconducting single photon detectors (SSPDs) is sensitive to the total energy. In addition, we demonstrate a caling law for the interchange of bias current and excitation energy. These results are achieved by studying multiphoton excitations in a nanodetector with a sparsity-based tomographic method that allows factoring out of the optical absorption. We demonstrate this scaling law over the entire range of the experiment, from 0.9 eV to 3.8 eV. The tomographic method facilitates investigation of the fundamental physics of the detection events in NbN wires and demonstrates that nanodetectors provide a useful model system to understand more complicated wire geometries such as the meandering wire of a SSPD.
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http://arxiv.org/abs/1301.3337
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