NIST researchers have created wider superconducting nanowire single-photon detectors (SNSPDs), exceeding 100 times the typical nanoscale size, to improve photon detection accuracy. The new design, detailed in an Optica paper, uses wires up to 0.1 millimeters wide, reducing false signals and enabling larger detector arrays. This advancement addresses limitations of traditional nanoscale SNSPDs, which struggle with low-energy photon detection and edge-related defects. The wider wires, paired with magnetic rail structures, allow for more uniform current flow and heightened sensitivity. While efficiency comparisons to nanoscale detectors remain pending, the team achieved a billion-fold reduction in dark counts. The innovation could benefit applications like healthcare imaging and astronomy, where detecting faint light is critical. The work, funded by DARPA, simplifies fabrication and enhances performance for low-light environments.
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