Laser-induced relaxation oscillations in superconducting nanobridge single-photon detectors
F. B. Baalbergen
I. E. Zadeh (TU Delft - Applied Sciences)
M. J.A. De Dood (Universiteit Leiden)
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Abstract
We demonstrate laser-induced relaxation oscillations in superconducting nanowire single-photon detectors (SNSPDs). These oscillations appear when a voltage-biased NbTiN nanobridge detector is illuminated with intense pulsed-laser light at a repetition rate of approximately 19MHz. They differ from the well-known relaxation oscillations by a stepwise increase in frequency and phase locking of the oscillations to the laser pulses. We create a model that incorporates electrical feedback and excludes thermal effects to simulate and explain the origin of the observed laser-induced relaxation oscillations. Qualitative agreement to the experiment is achieved using realistic values for the parameters in the model.
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