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Sensors 2016, 16(7), 953;

Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors

Istituto Nazionale di Ricerca Metrologica, St. delle Cacce 91, Torino 10135, Italy
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 5 May 2016 / Revised: 15 June 2016 / Accepted: 17 June 2016 / Published: 23 June 2016
(This article belongs to the Section Physical Sensors)
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Transition-edge sensors (TESs) are single photon detectors attractive for applications in quantum optics and quantum information experiments owing to their photon number resolving capability. Nowadays, high-energy resolution TESs for telecommunication are based on either W or Au/Ti films, demonstrating slow recovery time constants. We report our progress on the development of an Al/Ti TES. Since bulk aluminum has a critical temperature (Tc) of ca. 1.2 K and a sufficiently low specific heat (less than 10−4 J/cm3K2), it can be employed to produce the sensitive material for optical TESs. Furthermore, exploiting its high Tc, Al-based TESs can be trimmed in a wider temperature range with respect to Ti or W. A first Al/Ti TES with a Tc ≈ 142 mK, investigated from a thermal and optical point of view, has shown a response time constant of about 2 μs and single photon discrimination with 0.34 eV energy resolution at telecom wavelength, demonstrating that Al/Ti films are suitable to produce TESs for visible and NIR photon counting. View Full-Text
Keywords: photon counting detector; superconductivity; optics photon counting detector; superconductivity; optics

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Lolli, L.; Taralli, E.; Portesi, C.; Rajteri, M.; Monticone, E. Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors. Sensors 2016, 16, 953.

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