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Article overview
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Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content | | D. Henrich
; S. Dörner
; M. Hofherr
; K. Il'in
; A. Semenov
; E. Heintze
; M. Scheffler
; M. Dressel
; M. Siegel
; | | Date: |
9 Jul 2012 | | Abstract: | The spectral detection efficiency and the dark count rate of superconducting
nanowire single-photon detectors (SNSPD) has been studied systematically on
detectors made from thin NbN films with different chemical compositions.
Reduction of the nitrogen content in the 4 nm thick NbN films results in a more
than two orders of magnitude decrease of the dark count rates and in a red
shift of the cut-off wavelength of the hot-spot SNSPD response. The observed
phenomena are explained by an improvement of uniformity of NbN films that has
been confirmed by a decrease of resistivity and an increase of the ratio of the
measured critical current to the depairing current. The latter factor is
considered as the most crucial for both the cut-off wavelength and the dark
count rates of SNSPD. Based on our results we propose a set of criteria for
material properties to optimize SNSPD in the infrared spectral region. | | Source: | arXiv, 1207.2014 | | Services: | Forum | Review | PDF | Favorites | |
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