Lumped element kinetic inductance detectors based on two-gap MgB2 thin films

Lumped element kinetic inductance detectors (LEKIDs) are made from a single layer superconducting thin film. Because of their low noise and highly multiplexibility, LEKIDs provide a sensitive technology for the detection of millimeter and submillimeter waves. In this work, a 5-pixel 50-nm-thick MgB2...

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Bibliographic Details
Published in:Applied physics letters 2018-01, Vol.112 (2)
Main Authors: Yang, C., Niu, R. R., Guo, Z. S., Cai, X. W., Chu, H. M., Yang, K., Wang, Y., Feng, Q. R., Gan, Z. Z.
Format: Article
Language:English
Subjects:
Aluminum
Applied physics
Borides
Detectors
Inductance
Low noise
Magnesium compounds
Niobium
Q factors
Submillimeter waves
Temperature dependence
Thin films
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Summary:Lumped element kinetic inductance detectors (LEKIDs) are made from a single layer superconducting thin film. Because of their low noise and highly multiplexibility, LEKIDs provide a sensitive technology for the detection of millimeter and submillimeter waves. In this work, a 5-pixel 50-nm-thick MgB2 array is made. The microwave properties of the array are measured under dark conditions. We show that the loaded quality factor Q of the resonant circuit is 30 000 at 7.5 K, which is comparable to that of lower-operating-temperature (usually several hundred mK) LEKIDs made from superconductors such as Al and Nb. Moreover, the temperature dependence of resonance frequency gives the two-gap character of MgB2, Δπ (0) = 2.58 meV and Δσ (0) = 8.26 meV. The gap frequency (f = 2Δ/h) indicates that MgB2 LEKIDs have a promising application on terahertz detection.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5013286