Equivalence of Optical and Electrical Noise Equivalent Power of Hybrid NbTiN-Al Microwave Kinetic Inductance Detectors

Abstract

We have measured and compared the response of hybrid NbTiN-Al Microwave Kinetic Inductance Detectors (MKIDs) to changes in bath temperature and illumination by sub-mm radiation. We show that these two stimulants have an equivalent effect on the resonance feature of hybrid MKIDs. We determine an electrical NEP from the measured temperature responsivity, quasiparticle recombination time, superconducting transition temperature and noise spectrum, all of which can be measured in a dark environment. For the two hybrid NbTiN-Al MKIDs studied in detail the electrical NEP is within a factor of two of the optical NEP, which is measured directly using a blackbody source.

5 pages, 3 figures

References in corpus (3)

• Number fluctuations of sparse quasiparticles in a superconductor
• Microwave-induced excess quasiparticles in superconducting resonators measured through correlated conductivity fluctuations
• Anomalous response of superconducting titanium nitride resonators to terahertz radiation

Cited by in corpus (6)

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• Development of MKIDs for measurement of the Cosmic Microwave Background with the South Pole Telescope
• DESHIMA on ASTE: On-sky Responsivity Calibration of the Integrated Superconducting Spectrometer
• A multi-chroic kinetic inductance detectors array using hierarchical phased array antenna