High-resistivity niobium nitride films for saturated-efficiency SMSPDs at telecom wavelengths and beyond

Incorporating a micrometer scale strip as the sensitive element in superconducting single-photon detectors can lead to significant improvements in their speed, footprint, and fabrication yield. However, the current application of microstrips has resulted in a decline in the detectors' intrinsic...

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Bibliographic Details
Published in:Applied physics letters 2023-04, Vol.122 (15)
Main Authors: Zolotov, P., Svyatodukh, S., Divochiy, A., Seleznev, V., Goltsman, G.
Format: Article
Language:English
Subjects:
Applied physics
Critical temperature
Cryostats
Detectors
Niobium nitride
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Summary:Incorporating a micrometer scale strip as the sensitive element in superconducting single-photon detectors can lead to significant improvements in their speed, footprint, and fabrication yield. However, the current application of microstrips has resulted in a decline in the detectors' intrinsic detection efficiency. We address this issue through the utilization of niobium nitride films with high values of resistance per square. Notably, the films used in our study possess an important characteristic of retaining high critical temperature values, which enables the devices to operate in conventional closed-cycle cryostats.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0144998