超导微测辐射热计对λ = 8 μm红外单光子的能量分辨探测
Energy-resolved detection of single infrared photons with λ = 8 μm using a superconducting microbolometer
摘要：
本文报道用超导热电子微测辐射热计探测λ = 8 μm的单光子。传感元件是一个钛过渡边缘传感器，体积约为0.1 μm^3，制作在硅衬底上。泊松光子计数统计，包括3个光子的同时检测进行了观察。光子数峰的宽度为0.11 eV，光子能量的70%，在50-100 mK。这是迄今为止报道的超导设备的最佳数字之一。这样的设备可以适用于整个中红外甚至远红外的单光子量热光谱。
英文摘要：
We report on the detection of single photons with λ = 8 μm using a superconducting hot-electron microbolometer. The sensing element is a titanium transition-edge sensor with a volume ~ 0.1 μm^3 fabricated on a silicon substrate. Poisson photon counting statistics including simultaneous detection of 3 photons was observed. The width of the photon-number peaks was 0.11 eV, 70% of the photon energy, at 50-100 mK. This achieved energy resolution is one of the best figures reported so far for superconducting devices. Such devices can be suitable for single photon calorimetric spectroscopy throughout the mid-infrared and even the far-infrared.
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