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- W2797506696 abstract "Abstract Hotspot relaxation time ( τ th ) is one of the essential parameter which defines the maximum count rate of superconducting nanowire single-photon detectors (SNSPDs). We studied the τ th for NbN-based SNSPDs on various substrates using the two-photon detection method based on the pump-probe spectroscopy technique. We observed that τ th strongly increased with increasing bias current in the two-photon detection regime. In addition, the minimum hotspot relaxation time ( τ th ) min was not significantly affected by the bath temperature; this is different from the previous observations reported for WSi SNSPDs. In addition, a strong dependency of ( τ th ) min on the substrate was found. The minimum ( τ th ) min was 11.6 ps for SNSPDs made of 5.5-nm-thick NbN on MgO (100), whereas the maximum ( τ th ) min was 34.5 ps for SNSPDs made of 7.5-nm-thick NbN on Si (100). We presented a direct correlation between the values of τ th and degrees of disorder of NbN films grown on different substrates." @default.
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- W2797506696 date "2018-01-24" @default.
- W2797506696 modified "2023-10-11" @default.
- W2797506696 title "Hotspot relaxation time of NbN superconducting nanowire single-photon detectors on various substrates" @default.
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- W2797506696 doi "https://doi.org/10.1038/s41598-018-20035-7" @default.
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