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Probing the Hotspot Interaction Length in NbN Nanowire Superconducting Single-Photon Detectors

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arxiv 1607.03088 v1 pith:BRTC5FYT submitted 2016-07-11 cond-mat.supr-con physics.opticsquant-ph

J.J. Renema , R. Gaudio , Q. Wang , M.P. van Exter , A. Fiore , M.J.A. de Dood This is my paper · ORCID
classification cond-mat.supr-conphysics.opticsquant-ph
keywords detectioneventlengthnanowiresuperconductingabsorbedagreementbridges
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abstract

We measure the maximal distance at which two absorbed photons can jointly trigger a detection event in NbN nanowire superconducting single photon detector (SSPD) microbridges by comparing the one-photon and two-photon efficiency of bridges of different overall lengths, from 0 to 400 nm. We find a length of $23 \pm 2$ nm. This value is in good agreement with to size of the quasiparticle cloud at the time of the detection event.

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