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Superconducting microwire detectors with single-photon sensitivity in the near-infrared



Jeffrey T. Chiles, Sonia M. Buckley, Adriana E. Lita, Varun B. Verma, Jeffrey M. Shainline, Richard P. Mirin, Sae Woo Nam, Jason Allmaras, Boris Korzh, Emma Wollman, Matthew Shaw


We report on the fabrication and characterization of single-photon-sensitive WSi superconducting detectors with wire widths from 1 υm to 3 υm. The devices achieve saturated internal detection efficiency at 1.55 υm wavelength and exhibit maximum count rates in excess of 105 s-1. We also investigate the material properties of the silicon-rich WSi films used for these devices. We find that many devices with active lengths of several hundred microns exhibit critical currents in excess of 50% of the depairing current. A meandered detector with 2.0 υm wire width is demonstrated over a surface area of 360×360 υm2, showcasing the material and device quality achieved.
Applied Physics Letters


snsp, wsi, superconductors


Chiles, J. , Buckley, S. , Lita, A. , Verma, V. , Shainline, J. , Mirin, R. , Nam, S. , Allmaras, J. , Korzh, B. , Wollman, E. and Shaw, M. (2020), Superconducting microwire detectors with single-photon sensitivity in the near-infrared, Applied Physics Letters, [online], (Accessed May 30, 2024)


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Created June 15, 2020, Updated October 7, 2020