title: Large-sensitive-area superconducting nanowire single-photon detector at 850 nm with high detection efficiency.
abstract: Satellite-ground quantum communication requires single-photon detectors of 850-nm wavelength with both high detection efficiency and large sensitive area. We developed superconducting nanowire single-photon detectors (SNSPDs) on one-dimensional photonic crystals, which acted as optical cavities to enhance the optical absorption, with a sensitive-area diameter of 50 μm. The fabricated multimode fiber coupled NbN SNSPDs exhibited a maximum system detection efficiency (DE) of up to 82% and a DE of 78% at a dark count rate of 100 Hz at 850-nm wavelength as well as a system jitter of 105 ps.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.forename: Lixing
authors.initials: L
authors.lastname: You
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Yang
authors.forename: Weijun
authors.initials: W
authors.lastname: Zhang
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Liu
authors.forename: Sijing
authors.initials: S
authors.lastname: Chen
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Xie