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Article overview
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Current dependence of the hot-spot response spectrum of superconducting single-photon detectors with different layouts | | I.Charaev
; A. Semenov
; S. Doerner
; G. Gomard
; K. Ilin
; M. Siegel
; | | Date: |
22 Aug 2016 | | Abstract: | We show that avoiding bends in a current-carrying superconducting nanowire
enhances the probability for low energy photons to create a normal belt and to
be detected, and that this enhancement is entirely due to the increase in the
experimentally achievable critical current. We studied nanowires shaped as
either meander or spirals. The spirals had different layouts, double-spirals
with a S-turn in the middle and single-spirals without such turns. Nanowires
were prepared from films of niobium nitride with a thickness 5 nm. For each
layout we measured the spectra of the single-photon response in the wavelength
range from 400 nm to 1600 nm and defined the cut-off wavelength ({lambda}c)
beyond which the response rolls off. The largest and the smallest {lambda}c
were found for the single-spiral layout and for the meander, respectively. For
all three layouts the relationship between {lambda}c and the relative bias
current fall onto a universal curve which has been predicted earlier in the
framework of the modified hot-spot model. For the single-spiral layout, the
efficiency of photon detection at wavelengths smaller than {lambda}c reaches
the experimentally measured absorbance of the sample and the timing jitter per
unit length of the nanowire has the smallest value. | | Source: | arXiv, 1608.6083 | | Services: | Forum | Review | PDF | Favorites | |
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