Equivalence of optical and electrical noise equivalent power of hybrid NbTiN-Al microwave kinetic inductance detectors

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 elec...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (19)
Main Authors: Janssen, R. M. J., Endo, A., de Visser, P. J., Klapwijk, T. M., Baselmans, J. J. A.
Format: Article
Language:English
Subjects:
ALUMINIUM
Applied physics
Blackbody
Change detection
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Detectors
Electrical noise
Equivalence
ILLUMINANCE
INDUCTANCE
MICROWAVE SPECTRA
NIOBIUM
NOISE
QUASI PARTICLES
RECOMBINATION
RESONANCE
Stimulants
TITANIUM NITRIDES
TRANSITION TEMPERATURE
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Summary: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 noise equivalent power (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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4901733