TY  - CONF
AU  - Goltsman, G.
AU  - Korneev, A.
AU  - Minaeva, O.
AU  - Rubtsova, I.
AU  - Chulkova, G.
AU  - Milostnaya, I.
AU  - Smirnov, K.
AU  - Voronov, B.
AU  - Lipatov, A. P.
AU  - Pearlman, A. J.
AU  - Cross, A.
AU  - Slysz, W.
AU  - Verevkin, A. A.
AU  - Sobolewski, R.
A2  - Quantum Sensing and Nanophotonic Devices II
ED  - Razeghi, M.
ED  - Brown, G. J.
PY  - 2005
DA  - 2005//
TI  - Advanced nanostructured optical NbN single-photon detector operated at 2.0 K
T2  - Proc. SPIE
BT  - Proc. SPIE
SP  - 520
EP  - 529
VL  - 5732
PB  - Spie
KW  - NbN SSPD
KW  - SNSPD
AB  - We present our studies on quantum efficiency (QE), dark counts, and noise equivalent power (NEP) of the latest generation of nanostructured NbN superconducting single-photon detectors (SSPDs) operated at 2.0 K. Our SSPDs are based on 4 nm-thick NbN films, patterned by electron beam lithography as highly-uniform 100÷120-nm-wide meander-shaped stripes, covering the total area of 10x10 μm[super:2] with the meander filling factor of 0.7. Advances in the fabrication process and low-temperature operation lead to QE as high as  30-40% for visible-light photons (0.56 μm wavelength)-the saturation value, limited by optical absorption of the NbN film. For 1.55 μm photons, QE was  20% and decreased exponentially with the wavelength reaching  0.02% at the 5-μm wavelength. Being operated at 2.0-K temperature the SSPDs revealed an exponential decrease of the dark count rate, what along with the high QE, resulted in the NEP as low as 5x10[super:-21] W/Hz[super:-1/2], the lowest value ever reported for near-infrared optical detectors. The SSPD counting rate was measured to be above 1 GHz with the pulse-to-pulse jitter below 20 ps. Our nanostructured NbN SSPDs operated at 2.0 K significantly outperform their semiconducting counterparts and find practical applications ranging from noninvasive testing of CMOS VLSI integrated circuits to ultrafast quantum communications and quantum cryptography.
UR  - https://doi.org/10.1117/12.590455
DO  - 10.1117/12.590455
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1478), last updated on Mon, 17 May 2021 22:09:55 -0500
ID  - Goltsman_etal2005
ER  -