Waveguide integrated superconducting single-photon detectors implemented as near-perfect absorbers of coherent radiation

Mohsen K. Akhlaghi (), Ellen Schelew and Jeff F. Young ()
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Mohsen K. Akhlaghi: University of British Columbia
Ellen Schelew: University of British Columbia
Jeff F. Young: University of British Columbia

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract At the core of an ideal single-photon detector is an active material that absorbs and converts every incident photon to a discriminable signal. A large active material favours efficient absorption, but often at the expense of conversion efficiency, noise, speed and timing accuracy. In this work, short (8.5 μm long) and narrow (8 × 35 nm2) U-shaped NbTiN nanowires atop silicon-on-insulator waveguides are embedded in asymmetric nanobeam cavities that render them as near-perfect absorbers despite their small volume. At 2.05 K, when biased at 0.9 of the critical current, the resulting superconducting single-photon detectors achieve a near-unity on-chip quantum efficiency for ∼1,545 nm photons, an intrinsic dark count rate

Date: 2015
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DOI: 10.1038/ncomms9233

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