Doped niobium superconducting nanowire single-photon detectors |
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Authors: | Tao Jia Lin Kang Labao Zhang Qingyuan Zhao Min Gu Jian Qiu Jian Chen Biaobing Jin |
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Institution: | 1. Research Institute of Superconductor Electronics (RISE), Nanjing University, Nanjing, 210093, China
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Abstract: | We designed and fabricated a special doped niobium (Nb*) superconducting nanowire single-photon detector (SNSPD) on MgO substrate. The superconductivity of this ultra-thin Nb* film was further improved by depositing an ultra-thin aluminum nitride protective layer on top. Compared with traditional Nb films, Nb* films present higher T C and J C. We investigated the dependence of the characteristics of devices, such as cut-off wavelength, response bandwidth, and temperature, on their geometrical dimensions. Results indicate that reduction in both the width and thickness of Nb* nanowires extended the cut-off wavelength and improved the sensitivity. The Nb* SNSPD (50 nm width and 4.5 nm thickness) exhibited single-photon sensitivities at 1,310, 1,550, and 2,010 nm. We also demonstrated an enhancement in the detection efficiency by a factor of 10 in its count rate by lowering the working temperature from 2.26 K to 315 mK. |
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