Superconducting Nanowire Single Photon Detector With Efficiency Over 60% for 2-<italic>μ</italic>m-Wavelength
We demonstrate superconducting nanowire single photon detector (SNSPD) for the wavelength at around 2 μm. The linewidth of the NbN nanowire is squeezed to 56 nm to increase the intrinsic response efficiencies at longer wavelengths such as 2 μm. Serially connecting av...
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| Hauptverfasser: | , , , , , , , , |
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| Format: | Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
IEEE
2019-01-01
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| Schriftenreihe: | IEEE Photonics Journal |
| Schlagworte: | |
| Online-Zugang: | https://ieeexplore.ieee.org/document/8918020/ |
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| Zusammenfassung: | We demonstrate superconducting nanowire single photon detector (SNSPD) for the wavelength at around 2 μm. The linewidth of the NbN nanowire is squeezed to 56 nm to increase the intrinsic response efficiencies at longer wavelengths such as 2 μm. Serially connecting avalanche architecture is applied to increase the signal-to-noise ratio (SNR) of the response signal. Further, the optical cavity is optimized to improve the absorption of the device. A silica single-mode fiber is adopted to introduce photons to the SNSPD at a temperature of 2.25 K using a Gifford–McMahon cryocooler. The SNSPD exhibits detection efficiencies of 58%, 67%, and 63% at wavelengths of 1550, 1700, and 2000 nm, respectively, with dark count rate of ∼12 kcps, which is reduced to 2 cps when the attached fiber pigtail is all placed inside the 40-K cryostat. The detection efficiency at 2000 nm is 2.5 times greater than that of the best previously developed detector with an efficiency of 25%. Our SNSPD is promising for practical applications in molecular science and earth meteorology. |
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| ISSN: | 1943-0655 |