Development of Ti/Au Transition-Edge Sensors for Single-Photon Detection
IEEE Transactions on Applied Superconductivity(2024)
摘要
Transition-edge sensors (TESs) have shown remarkable energy resolution and photon-number resolving ability. In this paper, we report the fabrication and characterization of Ti/Au optical TESs for the detection of single photon at the telecommunication wavelength 1550 nm. A SiO2/SiNx antireflection coating is deposited on top of TESs by an inductively coupled plasma-assisted plasma-enhanced chemical vapor deposition (ICP-PECVD) process to improve the detection efficiency. Ti/Au (50/60 nm) TES with a small sensitive area 10 μm × 10 μm shows an energy resolution of 0.12 eV. The TES with a large sensitive area 20 μm × 20 μm can discriminate up to 55 incident photons and the detection efficiency is 46%.
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关键词
Ti/Au,Transition-Edge Sensor,antireflection coating,photon-number resolving,detection efficiency
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