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Superconducting nanowire single-photon detector with saturated internal quantum efficiency from visible to 1850 nm
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10.1063/1.3600793
/content/aip/journal/apl/98/25/10.1063/1.3600793
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/25/10.1063/1.3600793
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Figures

Image of FIG. 1.
FIG. 1.

Superconducting nanowire single-photon detector. (a) Scanning electron micrograph of a meander area. Inset: a zoomed image showing well-defined 150-nm-wide nanowires. (b) Measured superconducting transition temperature vs film thickness (square) and a fit (line). (c) Measured maximum bias current for a normal operation of the device vs temperature in an device. (d) A single-shot oscilloscope trace of an amplified electrical pulse of an device. The device was illuminated by an attenuated 1550 nm cw laser. The amplifier gain and bandwidth are 52 dB and 500 MHz. (e) Count rate of background light leakage vs bias current with the fiber port blocked from light.

Image of FIG. 2.
FIG. 2.

Bias dependence of the detector system efficiency. (a) Detector system efficiency vs bias current at different temperatures. The device was illuminated by an attenuated 1550 nm cw laser. Inset: the efficiency plot at 0.17 K on a semilog scale. (b) Normalized detection efficiency vs bias current with different wavelengths.

Image of FIG. 3.
FIG. 3.

Wavelength dependence of the detector system efficiency. Measured efficiencies and calculated spectral absorptances are plotted together for comparison. (a) Plot in a narrow wavelength range around 1550 nm, showing the fine interference pattern. (b) Plot of detection efficiency over a wide wavelength range. Measurement results using coarse wavelength steps from a white light source (circles) are plotted together with data from two tunable lasers (1550 and 1310 bands). The fine interference patterns shown in (a) cannot be clearly resolved in this plot and appear as bands.

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/content/aip/journal/apl/98/25/10.1063/1.3600793
2011-06-21
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconducting a-WxSi1−x nanowire single-photon detector with saturated internal quantum efficiency from visible to 1850 nm
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/25/10.1063/1.3600793
10.1063/1.3600793
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