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Soft X-Ray Single-Photon Detection With Superconducting Tantalum Nitride and Niobium Nanowires

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3 Author(s)
Kevin Inderbitzin ; Physics Institute, University of Zurich, Zurich, Switzerland ; Andreas Engel ; Andreas Schilling

We have fabricated ultrafast dark count-free soft X-ray single-photon detectors (X-SNSPDs) from TaN with various conduction path widths, and we compare their properties with corresponding data from a Nb X-SNSPD. The TaN X-SNSPDs offer an improved detector performance regarding device detection efficiency, latching, and pulse amplitudes. Wide conduction paths allow for a certain energy-resolving capability in contrast to narrow TaN conduction paths. However, wide paths also limit the detection efficiency at low temperatures, which can be explained within a hot-spot model.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:23 ,  Issue: 3 )