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Sensors 2016, 16(7), 953; doi:10.3390/s16070953

Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors

Istituto Nazionale di Ricerca Metrologica, St. delle Cacce 91, Torino 10135, Italy
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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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Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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