An optical transition-edge sensor with high energy resolution
An optical transition-edge sensor with high energy resolution
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DOI：
10.1088/1361-6668/ac7e7b
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发表时间：
2022-09-01
影响因子：
3.6
通讯作者：
Fukuda, Daiji
中科院分区：
文献类型：
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作者：
Hattori, Kaori;Konno, Toshio;Fukuda, Daiji
光学过渡边缘传感器（TES）已显示出用于解析电信波长处入射光子数量的能量分辨率。然而，生物成像和显微光谱学需要更高的能量分辨率。在这项研究中，我们测试了Au/Ti（10/20 nm）双层TES，显示出高的能量分辨率。通过将临界温度Tc降低到115 mK，实现了高能量分辨率，并且所得能量分辨率为67 meV半峰全宽（FWHM）（0.8 eV）。当Tc降低到115 mK时，考虑到光学IES的典型能量分辨率为150 meV，Tc为300 mK，理论分辨率将扩展到30 meV FWHM。为了研究理论期望值（30 meV）和测量值（67 meV）之间的差异，我们测量了TES的复阻抗和电流噪声。我们在TES中发现了过量的约翰逊噪声;在电阻为正常电阻的10%的偏置点处，过量的约翰逊噪声项M为1.5。作为参考，将上述TES与显示典型能量分辨率（156 meV FWHM）的TES进行比较。我们还讨论了提高或抑制能量分辨率的因素。
Optical transition-edge sensors (TESs) have shown an energy resolution for resolving the number of incident photons at the telecommunication wavelength. However, a higher energy resolution is required for biological imaging and microscopic spectroscopy. In this study, we tested an Au/Ti (10/20 nm) bilayer TES that showed a high energy resolution. The high energy resolution was achieved by lowering the critical temperature T-c to 115 mK, and the resultant energy resolution was 67 meV full width at half maximum (FWHM) at 0.8 eV. When T-c was reduced to 115 mK, the theoretical resolution would scale up to 30 meV FWHM, considering that the typical energy resolution of optical IESs was 150 meV and T-c was 300 mK. To investigate the difference between the theoretical expectation (30 meV) and the measured value (67 meV), we measured the complex impedance and current noise of the TES. We found excess Johnson noise in the TES; the excess Johnson noise term M was 1.5 at a bias point where the resistance was 10% of the normal resistance. For reference, the above mentioned TES was compared with a TES showing typical energy resolution (156 meV FWHM). We also discussed factors that improved or inhibited the energy resolution.