Position-Dependent Local Detection Efficiency in a Nanowire Superconducting Single-Photon Detector
Jelmer J. Renema, Q. Wang, Rosalinda Gaudio, Irina Komen, Koen op ‘t Hoog, Dondu Sahin, A. Schilling, Martin P. Van Exter, Andrea Fiore, Andreas Engel, M. J. A. de Dood · Nano Letters · 2015
We probe the local detection efficiency in a nanowire superconducting single-photon detector along the cross-section of the wire with a far subwavelength resolution. We experimentally find a strong variation in the local detection efficiency of the device. We demonstrate that this effect explains previously observed variations in NbN detector efficiency as a function of device geometry.