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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… Click to show full abstract
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.
Journal Title: Journal of Low Temperature Physics
Year Published: 2019
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