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• W3121431773 abstract "Abstract Properties of superconducting nanowires set the performance level for superconducting nanowire single photon detectors (SNSPDs). Reset time in commonly employed large area SNSPDs, 1–10 ns, is known to be limited by the nanowire’s kinetic inductance to the load impedance ratio. On the other hand, reduction of the kinetic inductance in small area (waveguide integrated) SNSPDs prevents biasing them close to the critical current due to latching into a permanent resistive state. In order to reduce the reset time in SNSPDs, superconducting nanowires with both low kinetic inductance and fast electron energy relaxation are required. In this paper, we report on a study of kinetic inductance in narrow (15–100 nm) and long (up to 120 μ m) superconducting MgB 2 nanowires made from 5 nm thick films, offering such combination of properties. Such films were grown using hybrid physical chemical vapor deposition, resulting in a critical temperature of ∼32 K, and a switch current density of 5 × 10 7 A cm −2 (at 4.8 K). Using microwave reflectometry, we measured a kinetic inductance of L k0 (4.8 K) = 1.3–1.6 pH/□ regardless of the nanowire width, which results in a magnetic field penetration depth of ∼90 nm. These values are very close to those in pristine MgB 2 . We showed that after excitations by a 50 fs pulsed laser the reset time in 35 nm × 120 μ m MgB 2 nanowires is 130 ps, which is more than a factor of 10 shorter than in NbN nanowires of similar length-to-width ratios. Depending on the bias current, such MgB 2 nanowires function as single-, double, or triple-photon detectors for both visible ( λ = 630 nm) and infrared ( λ = 1550 nm) photons, with a dark count rate of <10 cps. Although the apparent photon detection efficiency seems so far to be low, further technological advances (uniform nanowire width, smaller thickness, increasing the switching current closer to the pair-breaking current) may improve this figure of merit." @default.
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• W3121431773 date "2021-02-23" @default.
• W3121431773 modified "2023-10-18" @default.
• W3121431773 title "Low kinetic inductance superconducting MgB₂ nanowires with a 130 ps relaxation time for single-photon detection applications" @default.
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• W3121431773 doi "https://doi.org/10.1088/1361-6668/abdeda" @default.
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