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IEICE Technical Report; IEICE Tech. Rep.

Development of Superconducting Microwave Kinetic Inductance Detectors (MKIDs) with Dual-function Spiral Strip

Kensuke Nakajima, Atsushi SAITO, Seiichiro Ariyoshi, Hironobu Yamada, Jongsuck Bae, Ohshima Shigetoshi

Published Nov 5, 2014• 0 citations
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We investigated the relationship between loaded quality factor (QL) and responsivity of microwave kinetic inductance detectors (MKIDs) using a dual-function spiral strip (DFSS). Three types of DFSSs with different QL values were designed, and the S21properties were simulated when kinetic inductance of a superconductor was changed by using a 2.5-dimentional simulator. The simulated results showed that a very high QLvalue was not necessarily required. The resonator frequencies of the 25-MKID array using a better type of DFSS (QL~ 3500) were adjusted to be separated by 5 MHz around 2.0 GHz. The 25-MKID array were fabricated using 20-nm thick niobium nitride films deposited on r-plane sapphire substrates. We clearly observed 25 half-wavelength resonances around 2.0 GHz at 2.245 K. The optical responses were also confirmed using hot and cold radiation. The dependence of the responsivity on the QLindicated that the QLvalue of approximately 2000 could obtain higher responsivity.

IEEE Transactions on Applied Superconductivity•Nov 6, 2014•3 citations
We propose a novel microwave kinetic inductance detector (MKID) named spiral-MKID typified by a rewound spiral strip structure suitable for terahertz applications. The superconducting rewound strip works as a high-Q half wavelength microwave resonator as well as a broadband terahertz antenna. The spiral-MKIDs fabricated with NbN films reveal loaded quality factors of the order of 104 at 3 K. NbN is one of the promising materials suitable for working on a convenient 4K-refrigerator. We also discuss the expected noise equivalent power of the optimized detector.
We investigated the relationship between loaded quality factor (QL) and responsivity of microwave kinetic inductance detectors (MKIDs) using a dual-function spiral strip (DFSS). Three types of DFSSs with different QL values were designed, and the S21properties were simulated when kinetic inductance of a superconductor was changed by using a 2.5-dimentional simulator. The simulated results showed that a very high QLvalue was not necessarily required. The resonator frequencies of the 25-MKID array using a better type of DFSS (QL~ 3500) were adjusted to be separated by 5 MHz around 2.0 GHz. The 25-MKID array were fabricated using 20-nm thick niobium nitride films deposited on r-plane sapphire substrates. We clearly observed 25 half-wavelength resonances around 2.0 GHz at 2.245 K. The optical responses were also confirmed using hot and cold radiation. The dependence of the responsivity on the QLindicated that the QLvalue of approximately 2000 could obtain higher responsivity.