Studies on Terahertz Photon Counting Detectors with Low-Leakage SIS Junctions

被引：7

作者：

Ezawa, Hajime ^{[1
,2
]}

Matsuo, Hiroshi ^{[1
,2
]}

Ukibe, Masahiro ^{[3
]}

Fujii, Go ^{[3
]}

Shiki, Shigetomo ^{[3
]}

机构：

[1] NAOJ, Mitaka, Tokyo, Japan

[2] Grad Univ Adv Studies SOKENDAI, Mitaka, Tokyo, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki, Japan

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2019年 / 194卷 / 5-6期

关键词：

Superconducting tunnel junction; Terahertz detector; Photon counting;

D O I：

10.1007/s10909-019-02149-y

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We plan to realize a fast terahertz photon counting detector. The detector may resolve each photon signal from the source and enable us to introduce "photon statistics," which will be a new measure for terahertz astronomy and astrophysics. An SIS junction with Nb/Al/AlOx/Al/Nb is considered for this detector, which should incorporate low leakage current of 1 pA. We have successfully developed an SIS junction to satisfy this requirement. The bandwidth is limited, while it is sufficient for laboratory experiments. We have designed an antenna-coupled SIS detector incorporating the low-leakage SIS junction for photon counting experiments. Additionally, the photo-response of the SIS junction is measured to discuss the photon counting capability in combination with the fast readout system.

引用

页码：426 / 432

页数：7

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