We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation wit...We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation with a high fluence of 1×10^(17)ions/cm^(2).The SMSPD exhibits saturated internal detection efficiency over a broad spectral range from 400 nm to 5μm at 0.32 K,with a minimum timing jitter of 28 ps(at 1064 nm).The detection current scales with photon energy asα≈`0.5,indicating vortex-assisted hotspot formation as the underlying detection mechanism.展开更多
基金supported by the Quantum Science and Technology-National Science and Technology Major Project(Grant No.2023ZD0300100)the National Natural Science Foundation of China(Grant No.62371443)+3 种基金the Shanghai Sailing Program(Grant No.22YF1456500)the Strategic Priority Research Program(B)of the Chi-nese Academy of Sciences(XDB0580000)the Youth Innovation Promotion Association of CAS(Grant No.2021230)support from the Youth Innovation Promotion Association,CAS(Y2023071)。
文摘We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation with a high fluence of 1×10^(17)ions/cm^(2).The SMSPD exhibits saturated internal detection efficiency over a broad spectral range from 400 nm to 5μm at 0.32 K,with a minimum timing jitter of 28 ps(at 1064 nm).The detection current scales with photon energy asα≈`0.5,indicating vortex-assisted hotspot formation as the underlying detection mechanism.
