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Marsili, Francesco; Najafi, Faraz; Dauler, Eric; Bellei, Francesco; Hu, Xiaolong; Csete, Maria; Molnar, Richard J.; Berggren, Karl K. |
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Single-photon detectors based on ultranarrow superconducting nanowires |
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Journal Article |
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2011 |
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Nano Letters |
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Nano Lett. |
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11 |
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5 |
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2048–2053 |
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SNSPD |
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We report efficient single-photon detection (η = 20% at 1550 nm wavelength) with ultranarrow (20 and 30 nm wide) superconducting nanowires, which were shown to be more robust to constrictions and more responsive to 1550 nm wavelength photons than standard superconducting nanowire single-photon detectors, based on 90 nm wide nanowires. We also improved our understanding of the physics of superconducting nanowire avalanche photodetectors, which we used to increase the signal-to-noise ratio of ultranarrow-nanowire detectors by a factor of 4, thus relaxing the requirements on the read-out circuitry and making the devices suitable for a broader range of applications. |
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RPLAB @ gujma @ |
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659 |
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Manova, N. N.; Korneeva, Yu. P.; Korneev, A. A.; Slysz, W.; Voronov, B. M.; Gol'tsman, G. N. |
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Superconducting NbN single-photon detector integrated with quarter-wave resonator |
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2011 |
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Tech. Phys. Lett. |
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Tech. Phys. Lett. |
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37 |
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5 |
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469-471 |
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SSPD, SNSPD |
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The spectral dependence of the quantum efficiency of superconducting NbN single-photon detectors integrated with quarter-wave resonators based on Si3N4, SiO2, and SiO layers has been studied. |
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RPLAB @ gujma @ |
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664 |
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Baek, Burm; Lita, Adriana E.; Verma, Varun; Nam, Sae Woo |
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Superconducting a-WxSi1–x nanowire single-photon detector with saturated internal quantum efficiency from visible to 1850 nm |
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2011 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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98 |
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25 |
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3 |
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SNSPD |
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We have developed a single-photon detector based on superconducting amorphous tungsten–silicon alloy (a-WxSi1–x) nanowire. Our device made from a uniform a-WxSi1–x nanowire covers a practical detection area (16 μm×16 μm) and shows high sensitivity featuring a plateau of the internal quantum efficiencies, i.e., efficiencies of generating an electrical pulse per absorbed photon, over a broad wavelength and bias range. This material system for superconducting nanowire detector technology could overcome the limitations of the prevalent nanowire devices based on NbN and lead to more practical, ideal single-photon detectors having high efficiency, low noise, and high count rates. |
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665 |
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Yang, J.K.W.; Kerman, A.J.; Dauler, E.A.; Cord, B.; Anant, V.; Molnar, R.J.; Berggren, K.K. |
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Suppressed critical current in superconducting nanowire single-photon detectors with high fill-factors |
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2009 |
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IEEE Trans. Appl. Supercond. |
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19 |
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3 |
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318-322 |
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SNSPD |
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In this work we present a new fabrication process that enabled the fabrication of superconducting nanowire single photon detectors SNSPD with fill-factors as high as 88% with gaps between nanowires as small as 12 nm. This fabrication process combined high-resolution electron-beam lithography with photolithography. Although this work was motivated by the potential of increased detection efficiency with higher fill-factor devices, test results showed an unexpected systematic suppression in device critical currents with increasing fill-factor. |
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RPLAB @ gujma @ |
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677 |
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Hu, Xiaolong; Zhong, Tian; White, James E.; Dauler, Eric A. Najafi, Faraz; Herder, Charles H.; Wong, Franco N. C.; Berggren, Karl K. |
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Fiber-coupled nanowire photon counter at 1550 nm with 24% system detection efficiency |
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2009 |
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Optics Letters |
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Opt. Lett. |
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34 |
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23 |
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3607-3609 |
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SNSPD |
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We developed a fiber-coupled superconducting nanowire single-photon detector system in a close-cycled cryocooler and achieved 24% and 22% system detection efficiencies at wavelengths of 1550 and 1315 nm, respectively. The maximum dark count rate was ~1000 counts/s. |
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679 |
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