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The Japan Society of Applied Physics

Sensitivity of a Microwave Kinetic Inductance Detector (MKID)

Takashi Noguchi

Published Feb 13, 2013• 0 citations
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The surface impedance of a superconductor changes when energy is absorbed and Cooper pairs are broken to produce single electron (quasiparticle) excitations. This change may be sensitively measured using a thin-film resonant circuit called a microwave kinetic inductance detector (MKID). The practical application of MKIDs for photon detection requires a method of efficiently coupling the photon energy to the MKID. The authors present results on position sensitive x-ray detectors made by using two aluminum MKIDs on either side of a tantalum photon absorber strip. Diffusion constants, recombination times, and energy resolution are reported. MKIDs can easily be scaled into large arrays.

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This paper examines how the thickness of Microwave Kinetic Inductance Detectors (MKIDs) films affects their sensitivity. We fabricated MKIDs with different film thicknesses on monocrystalline silicon substrates and investigated their response rate, noise, and sensitivity at 100 mK. Our results indicate that changes in film thickness do not impact the noise spectrum, but they do lead to a decrease in the responsivity of the MKID. Ultimately, this decrease in responsivity results in a reduction in the sensitivity of the MKIDs.
The surface impedance of a superconductor changes when energy is absorbed and Cooper pairs are broken to produce single electron (quasiparticle) excitations. This change may be sensitively measured using a thin-film resonant circuit called a microwave kinetic inductance detector (MKID). The practical application of MKIDs for photon detection requires a method of efficiently coupling the photon energy to the MKID. The authors present results on position sensitive x-ray detectors made by using two aluminum MKIDs on either side of a tantalum photon absorber strip. Diffusion constants, recombination times, and energy resolution are reported. MKIDs can easily be scaled into large arrays.