6 May 2015 Ultrafast superconducting single-photon detector with reduced-size active area coupled to a tapered lensed single-mode fiber
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Abstract
We present an ultrafast NbN Superconducting single-photon detector (SSPD) with active area of 3x3 μm2, which reveals better timing performances than a previously developed SSPD with active area of 10x10 μm2. The improved SSPD demonstrates the record timing jitter <25 ps, ultra short recovery time <2 ns, extremely low dark counts level, and high detection efficiency (DE) in a wide spectral range from visible to near-infrared. The record parameters were obtained thanks to the development of a new technique of an effective optical coupling between a detector with reduced-size active area and a standard single-mode telecommunication fiber. The advantages of a new approach are experimentally confirmed by performed electro-optical measurements of the device performances.
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Maria V. Sidorova, Alexander Divochiy, Yury B. Vakhtomin, Konstantin Smirnov, "Ultrafast superconducting single-photon detector with reduced-size active area coupled to a tapered lensed single-mode fiber", Proc. SPIE 9504, Photon Counting Applications 2015, 950408 (6 May 2015); doi: 10.1117/12.2178131; https://doi.org/10.1117/12.2178131
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