Nanowires of Y-Ba-Cu-O, with the thickness of 50 nm and the width ranging from 90 nm to 500 nm have been successfully grown on lanthanum aluminate substrates for photon detection experiments. The nanowires were up to 10- μm long and formed a meander structure, covering the area of up to 30×10 μm² with a fill factor of 50%. The samples were excited using optical laser pulses at a 1550 nm wavelength and resulting photoresponse signals were measured as a function of both temperature and normalized bias current. Presence of two, distinct regimes in the photoresponse temperature dependence has been clearly evidenced, suggesting different physical mechanisms of the signal formation. Presented experimental results shed new light on prospects of implementation of high-temperature superconducting oxides in photon detection and counting.

Date Published: 19 May 2015
PDF: 4 pages
Proc. SPIE 9504, Photon Counting Applications 2015, 950406 (19 May 2015); doi: 10.1117/12.2179677

Published in SPIE Proceedings Vol. 9504:
Photon Counting Applications 2015
Ivan Prochazka; Roman Sobolewski; Ralph B. James, Editor(s)