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Anomalous response of superconducting titanium nitride resonators to terahertz radiation

Bueno, J., Coumou, P. C. J. J., Zheng, G., de Visser, P. J., Klapwijk, T. M., Driessen, E. F. C., Doyle, Simon and Baselmans, J. J. A 2014. Anomalous response of superconducting titanium nitride resonators to terahertz radiation. Applied Physics Letters 105 (19) , -. 10.1063/1.4901536

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We present an experimental study of kinetic inductance detectors (KIDs) fabricated of atomic layer deposited TiN films and characterized at radiation frequencies of 350 GHz. The responsivity to radiation is measured and found to increase with the increase in radiation powers, opposite to what is expected from theory and observed for hybrid niobium titanium nitride/aluminium (NbTiN/Al) and all-aluminium (all-Al) KIDs. The noise is found to be independent of the level of the radiation power. The noise equivalent power improves with higher radiation powers, also opposite to what is observed and well understood for hybrid NbTiN/Al and all-Al KIDs. We suggest that an inhomogeneous state of these disordered superconductors should be used to explain these observations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: AIP Publishing
ISSN: 0003-6951
Funders: STFC
Date of First Compliant Deposit: 11 July 2017
Date of Acceptance: 30 October 2014
Last Modified: 27 Feb 2020 15:31

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