Single photon detection system for visible and infrared spectrum range
Alexander V. Divochiy, Marta Misiaszek, Yury B. Vakhtomin, Pavel Morozov, Konstantin V. Smirnov, Philipp I. Zolotov, Piotr Leszek Kolenderski · Optics Letters · 2018
We demonstrate niobium nitride based superconducting single-photon detectors sensitive in the spectral range 452–2300 nm. The system performance was tested in a real-life experiment with correlated photons generated by means of spontaneous parametric downconversion, where one photon was in the visible range and the other was in the infrared range. We measured a signal to noise ratio as high as 4×104 in our detection setting. A photon detection efficiency as high as 64% at 1550 nm and 15% at 2300 nm was observed.