PT Journal
AU Bueno, J
   Coumou, PCJJ
   Zheng, G
   de Visser, PJ
   Klapwijk, TM
   Driessen, EFC
   Doyle, S
   Baselmans, JJA
TI Anomalous response of superconducting titanium nitride resonators to terahertz radiation
SO Appl. Phys. Lett.
PY 2014
BP 192601 (1 to 5)
VL 105
DE KID; TiN; NEP; disordered superconductors; inhomogeneous state
AB 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.
ER