Probing the hotspot interaction length in NbN nanowire superconducting single photon detectors
Probing the hotspot interaction length in NbN nanowire superconducting single photon detectors
We measure the maximal distance at which two absorbed photons can jointly trigger a detection event in NbN nanowire superconducting single photon detector microbridges by comparing the one-photon and two-photon efficiencies of bridges of different overall lengths, from 0 to 400 nm. We find a length of 23 ± 2 …