Rise time of voltage pulses in NbN superconducting single photon detectors
K. V. Smirnov, A. V. Divochiy, Yu. B. Vakhtomin, M. V. Sidorova, U. V. Karpova, Pavel Morozov, V. A. Seleznev, A. N. Zotova, D. Yu. Vodolazov · Applied Physics Letters · 2016
We have found experimentally that the rise time of voltage pulse in NbN superconducting single photon detectors increases nonlinearly with increasing the length of the detector L. The effect is connected with dependence of resistance of the detector Rn, which appears after photon absorption, on its kinetic inductance Lk and, hence, on the length of the detector. This conclusion is confirmed by our calculations in the framework of two temperature model.