Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors
AbstractTransition-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
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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.
Lolli L, Taralli E, Portesi C, Rajteri M, Monticone E. Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors. Sensors. 2016; 16(7):953.Chicago/Turabian Style
Lolli, Lapo; Taralli, Emanuele; Portesi, Chiara; Rajteri, Mauro; Monticone, Eugenio. 2016. "Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors." Sensors 16, no. 7: 953.
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