The device physics of parallel-wire superconducting nanowire single photondetectors is based on a cascade process. Using nano-optical techniques and aparallel wire device with spatially-separate pixels we explicitly demonstratethe single- and multi-photon triggering regimes. We develop a model fordescribing efficiency of a detector operating in the arm-trigger regime. Weinvestigate the timing response of the detector when illuminating a singlepixel and two pixels. We see a change in the active area of the detectorbetween the two regimes and find the two-pixel trigger regime to have a fastertiming response than the one-pixel regime.
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