Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 509, Issue -, Pages 16-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2014.09.017
Keywords
High-temperature superconductivity; Yttrium barium copper oxide; Pulsed-laser deposition; Nanostructures and nanowires; Optical photoresponse; Superconducting single-photon detectors
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Funding
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation (Goteborg)
- EU under the MAMA project (Napoli)
- European Regional Development Fund [POIG.01.01.02-00-108/09]
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The possible use of high-temperature superconductors (HTS) for realizing superconducting nanowire single-photon detectors is a challenging, but also promising, aim because of their ultrafast electron relaxation times and high operating temperatures. The state-of-the-art HTS nanowires with a 50-nm thickness and widths down to 130 nm have been fabricated and tested under a 1550-nm wavelength laser irradiation. Experimental results presenting both the amplitude and rise times of the photoresponse signals as a function of the normalized detector bias current, measured in a wide temperature range, are discussed. The presence of two distinct regimes in the photoresponse temperature dependence is clearly evidenced, indicating that there are two different response mechanisms responsible for the HTS photoresponse mechanisms. (C) 2014 Elsevier B.V. All rights reserved.
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