NbN superconducting nanowire single-photon detector fabricated on MgF2 substrate
NbN superconducting nanowire single-photon detector fabricated on MgF2 substrate
复制标题
MgF2 基底上的 NbN 超导纳米线单光子探测器
DOI：
10.1088/0953-2048/29/6/065011
复制
发表时间：
2016-06-01
影响因子：
3.6
通讯作者：
Tong, L. M.
中科院分区：
文献类型：
--
作者：
Wu, J. J.;You, L. X.;Tong, L. M.
The performance of superconducting nanowire single-photon detectors (SNSPDs) relies on substrate materials. Magnesium fluoride (MgF2) exhibits outstanding optical properties, such as large optical transmission range and low refractive index (n = 1.38), making it an attractive substrate. We present the fabrication and the performance of SNSPDs made of a 4.5 nm thick NbN thin film deposited on MgF2 substrate for the wavelength of 1550 nm. The front-side illuminated SNSPDs without an optical cavity showed a maximal detection efficiency of 12.8% at a system dark count rate (DCR) of 100 Hz, while the backside illuminated SNSPDs with a SiO2/Au optical cavity atop displayed a maximal detection efficiency of 33% at a DCR of 100 Hz.
