Large sensitive-area NbN nanowire superconducting single-photon detectors fabricated on single-crystal MgO substrates

Miki, S., Fujiwara, M., Sasaki, M., Baek, B., Miller, A.J., Hadfield, R.H. , Nam, S.W. and Wang, Z. (2008) Large sensitive-area NbN nanowire superconducting single-photon detectors fabricated on single-crystal MgO substrates. Applied Physics Letters, 92(6), 061116. (doi:10.1063/1.2870099)

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Abstract

We report on the performance of large area NbN nanowire superconducting single-photon detectors (SSPDs). 20×20 μm2 area SSPDs with 80 and 100 nm linewidths and 50% fill factor were fabricated in 4-nm-thick NbN films grown on single-crystal MgO substrates. The high quality of the devices was verified by electrical and optical testing and compares favorably to measurements of 10×10 μm2 area SSPDs. Measurements of kinetic inductance versus bias current indicate that the constriction density is low. The fiber-coupled detection efficiency of the devices was 0.4%–3.5% at 100 Hz dark count rate.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert
Authors: Miki, S., Fujiwara, M., Sasaki, M., Baek, B., Miller, A.J., Hadfield, R.H., Nam, S.W., and Wang, Z.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
ISSN:0003-6951
Published Online:15 February 2008

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