Characterization of superconducting nanowire single-photon detector with artificial constrictions

Zhang, Ling; You, Lixing; Liu, Dengkuan; Zhang, Weijun; Zhang, Lu; Liu, Xiaoyu; Wu, Junjie; He, Yabai; Lv, Cuicui; Wang, Zhen; Xie, Xiaoming

doi:10.1063/1.4881981

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…The physics of electrical noise is with debate [26], [27] for complex electrical-thermal interaction over nano-structured device. Semi-empirical results indicate that the chips with uniformed nanowires produce less dark counts [28]. Thus, the low dark count rate was attributed to high quality NbN films of our group [29], reduced bias current and narrow response spectra which filtered the background light as 3.2.…”

Section: System Efficiency and Dark Count Ratementioning

confidence: 83%

Multimode Fiber Coupled Superconductor Nanowire Single-Photon Detector

Zhang

Jia

et al. 2014

IEEE Photonics J.

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High-performance superconductor nanowire single-photon detectors (SNSPDs) coupled by 50-m multimode fiber were designed and fabricated for the purpose of space applications. Microlens coupling between multimode fiber and detector chip was proposed, resulting in coupling efficiency of 86% at the chips with detection area of 15 Â 15 m 2 . An optical structure for enhancing the photons absorption and superconductor nanowires with low critical current of 3 A were fabricated on the chips. A cryogenic amplifier was adopted to increase the signal-to-noise ratio and time jitter of output pulse. The SNSPD exhibited system efficiency (1550 nm) of 56% at a dark count rate of 100 cps, 50% at a dark count rate of 5 cps, and 40% at a dark count rate of 1 cps. The time jitter was 46 ps at full-width at half-maximum. The multimode fiber coupling system with high performance will promote its applications in free space.

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Section: System Efficiency and Dark Count Ratementioning

confidence: 83%

Multimode Fiber Coupled Superconductor Nanowire Single-Photon Detector

Zhang

Jia

et al. 2014

IEEE Photonics J.

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“…The non-saturating switching rate is common in nanoconstriction detectors where the device geometry leads to a position-dependent I c . Thus, as I b is increased the effective active area of the nanodetector changes and the switching rate does not fully saturate [35,36].…”

Section: Statistics Of the Switching Events And Single-photon Sensiti...mentioning

confidence: 99%

Two-dimensional cuprate nanodetector with single telecom photon sensitivity at T = 20 K

et al. 2023

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Detecting light at the single-photon level is one of the pillars of emergent photonic technologies. This is realized through state-of-the-art superconducting detectors that offer efficient, broadband and fast response. However, the use of low TC superconducting thin films limits their operation temperature below 4 K. Here, we demonstrate proof-of-concept nanodetectors based on exfoliated, two-dimensional cuprate superconductor Bi2Sr2CaCu2O8-δ that exhibit single-photon sensitivity at telecom wavelength at a record temperature of T = 20 K. These non-optimized devices exhibit a slow (~ ms) reset time and a low detection efficiency (~ 10^(-4)). We realize the elusive prospect of single-photon sensitivity on a high-TC nanodetector thanks to a novel approach, combining van der Waals fabrication techniques and a non-invasive nanopatterning based on light ion irradiation. This result paves the way for broader application of single-photon technologies, relaxing the cryogenic constraints for single-photon detection at telecom wavelength.

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“…Increasing the active area of nanowires to achieve SNSPDs' large area detection while increasing their count rate and detection efficiency is a major research direction. However, common methods for achieving large-area nanowire arrays, such as extending a single nanowire, increase the kinetic inductance of the SNSPD, which results in higher timing jitter and longer recovery time [83,84]. Moreover, the difficulty of fabrication and product uniformity can also affect detection.…”

Section: Nanowire Size and Geometrical Parametersmentioning

confidence: 99%

Niobium Nitride Preparation for Superconducting Single-Photon Detectors

Luo,

Zhao

2023

Molecules

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Niobium nitride (NbN) is widely used in the production of superconducting nanowire single-photon detectors (SNSPDs) due to its high superconducting transition temperature and suitable energy gap. The processing parameters used for the preparation of NbN films and the subsequent processing of nanowires have a significant effect on the performance of the SNSPD. In this review, we will present various thin film growth methods, including magnetron sputtering, atomic layer deposition (ALD), and chemical vapor deposition (CVD). The relationships between the superconducting performance of each thin film and the corresponding deposition process will be discussed. Subsequently, NbN nanowire fabrication methods and microstructures based on thin film etching will be summarized, and their impact on the qualities of the finished SNSPDs will be systematically analyzed. Finally, we will provide an outlook for the future development of preparation for SNSPD.

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Characterization of superconducting nanowire single-photon detector with artificial constrictions

Cited by 11 publications

References 23 publications

Multimode Fiber Coupled Superconductor Nanowire Single-Photon Detector

Multimode Fiber Coupled Superconductor Nanowire Single-Photon Detector

Two-dimensional cuprate nanodetector with single telecom photon sensitivity at T = 20 K

Niobium Nitride Preparation for Superconducting Single-Photon Detectors

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