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(a) SEM picture of a NbTiN detector. The detector is and the wire is 100 nm wide and 6 nm thick. (b) Electrical model of the SSPD setup. The switch together with the normal resistance and the kinetic inductance model the detection principle of the SSPD.
Quantum efficiency vs bias current for different wavelengths and temperatures, with an exponential fit through the data points. Cooling from 4.2 to 2.4 K exhibits an increase in quantum efficiency. In the inset a time trace of a detection event is shown.
(a) Dark counts as a function of bias current and counter trigger level at a temperature of 4.2 K (yellow). A dark count trace for an identical NbN detector is shown for 60 mV counter trigger level (red). (b) Photon counts/s as a function of bias current and counter trigger level. The incident laser power is 0.01 nW with 650 nm wavelength.
NEP for different trigger levels measured at 4.2 K.
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