Figure 1
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Figure 1: η as a function of the normalized bias current (IB / IC) for a constricted SNSPD (red curve) and a constriction-free SNSPD (blue curve) based on 30 nm wide nanowires. Inset: Scanning electron microscope image of an SNSPD hydrogen silsesquioxane mask on NbN. The nanowires are 30 nm wide and the pitch is 100 nm.