IR SINGLE-PHOTON RECIEVER
BASED ON ULTRATHIN NbN SUPERCONDUCTING FILM
A. A. Korneev1, A. V. Divochiy1,2,
Yu. B. Vakhtomin2, Yu. P. Korneeva1, P. A. Larionov1,
N. N. Manova1, I. N. Florya1, A. V. Trifonov1,3,
B. M. Voronov1, K. V. Smirnov1,2, A. V. Semenov1,
G. M. Chulkova1,3, G. N. Goltsman1,2
1 Moscow State Pedagogical University
2 CJSC “Superconducting nanotechnology”
3 Nizhny Novgorod State Technical University n.a. R.E. Alekseev
Received May 16, 2013
Abstract. We present our recent
results in research and development of superconducting single-photon detector
(SSPD). We achieved the following performance improvement: first, we developed
and characterized SSPD integrated in optical cavity and enabling its
illumination from the face side, not through the substrate, second, we improved
the quantum efficiency of the SSPD at around 3 μm wavelength by reduction
of the strip width to 40 nm, and, finally, we improved the detection efficiency
of the SSPD-based single-photon receiver system up to 20% at 1550 nm and
extended its wavelength range beyond 1800 nm by the usage of the fluoride ZBLAN
fibres.
Keywords: Infrared single-photon detectors, superconducting
thin film device fabrication, NbN films.