We have developed a practical superconducting nanowire single photon detector (SNSPD) system with our superconducting thin films and devices fabrication, optical coupling packaging, and cryogenic technology. The SNSPD devices were fabricated from high-quality niobium nitride (NbN) ultra-thin films that were epitaxially grown on single-crystal MgO substrates, and optical cavity structure were applied for improvement of photo absorption efficiency. The SNSPD system was developed based on a compact Gifford-McMahon (GM) cryocooler, in which SNSPD can operate continuously at temperature of 2.9 K +/- 10 mK with low power consumption without any liquid cryogens. The system detection efficiencies at 1550 nm wavelength (at a 100 Hz dark count rate) were found to be 2.6% for device without optical cavity and 21% for device with optical cavity. The response speed of devices showed maximally 200 MHz with 5 × 5 mm square device, and timing jitter of 100 ps full width at a half maximum (FWHM) was observed.


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    Title :

    Development of practical superconducting nanowire single photon detector system with high detection efficiency


    Contributors:
    Miki, S (author) / Yamashita, T (author) / Terai, H (author) / Fujiwara, M (author) / Sasaki, M (author) / Zhen Wang, (author)


    Publication date :

    2011-05-01


    Size :

    725214 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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