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26 April 2024

» arxiv » 1511.5786

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Free space-coupled superconducting nanowire single photon detectors for infrared optical communications
Francesco Bellei ; Alyssa P. Cartwright ; Adam N. McCaughan ; Andrew E. Dane ; Faraz Najafi ; Quinyuan Zhao ; Karl K. Berggren ;
Date:	18 Nov 2015
Abstract:	This paper describes the construction of a cryostat and an optical system with a free-space coupling efficiency of 56.5% +/- 3.4% to a superconducting nanowire single-photon detector (SNSPD) for infrared quantum communication and spectrum analysis. A 1K pot decreases the base temperature to T = 1.7 K from the 2.9 K reached by the cold head cooled by a pulse-tube cryocooler. The minimum spot size coupled to the detector chip was 6.6 +/- 0.11 {mu}m starting from a fiber source at wavelength, {lambda} = 1.55 {mu}m. We demonstrated efficient photon counting on a detector with an 8 x 7.3 {mu}m^2 area. We measured a dark count rate of 95 +/- 3.35 kcps and a system detection efficiency of 1.64% +/- 0.13%. We explain the key steps that are required to further improve the coupling efficiency.
Source:	arXiv, 1511.5786
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