Anomalous response of superconducting titanium nitride resonators to terahertz radiation

Abstract

We present an experimental study of 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 increasing 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 (NEP) 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.

References in corpus (16)

• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Titanium Nitride Films for Ultrasensitive Microresonator Detectors
• Low Loss Superconducting Titanium Nitride Coplanar Waveguide Resonators
• Minimal resonator loss for circuit quantum electrodynamics
• Strongly disordered TiN and NbTiN s-wave superconductors probed by microwave electrodynamics
• Fluctuations in the electron system of a superconductor exposed to a photon flux
• A superconducting focal plane array for ultraviolet, optical, and near-infrared astrophysics
• Contribution of dielectrics to frequency and noise of NbTiN superconducting resonators
• Photon noise limited radiation detection with lens-antenna coupled Microwave Kinetic Inductance Detectors
• A titanium-nitride near-infrared kinetic inductance photon-counting detector and its anomalous electrodynamics
• Etch Induced Microwave Losses in Titanium Nitride Superconducting Resonators
• High optical efficiency and photon noise limited sensitivity of microwave kinetic inductance detectors using phase readout
• Photon-noise limited sensitivity in titanium nitride kinetic inductance detectors
• Electrodynamic response and local tunnelling spectroscopy of strongly disordered superconducting TiN films
• Optical excitation of phase modes in strongly disordered superconductors
• Microwave properties of superconducting atomic-layer deposited TiN films

Cited by in corpus (9)

• Interplay between kinetic inductance, non-linearity and quasiparticle dynamics in granular aluminum MKIDs
• Bi-layer Kinetic Inductance Detectors for space observations between 80-120 GHz
• Equivalence of Optical and Electrical Noise Equivalent Power of Hybrid NbTiN-Al Microwave Kinetic Inductance Detectors
• The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors
• Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors
• High quality factor manganese-doped aluminum lumped-element kinetic inductance detectors sensitive to frequencies below 100 GHz
• Large Inverse Transient Phase Response of Titanium-nitride-based Microwave Kinetic Inductance Detectors
• Recombination of localized quasiparticles in disordered superconductors
• Strong Reduction of Quasiparticle Fluctuations in a Superconductor due to Decoupling of the Quasiparticle Number and Lifetime