Design evaluation of microwave transmission properties of YBa2Cu3O7-based kinetic inductance detectors

• Published in: Materials research express Vol. 8; no. 11; pp. 116001 - 116006
• Main Authors: Ariyoshi, Seiichiro, Mikami, Hikaru, Ebata, Atsushi, Ohnishi, Satoshi, Hizawa, Takeshi, Tanaka, Saburo, Nakajima, Kensuke
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01-11-2021
• Subjects: Broadband; cuprate superconductor; Detectors; Evaluation; Inductance; kinetic inductance detector; Microwave resonance; Microwave transmission; Network analysers; Q factors; Resonators; Simulation; Strip; Substrates; terahertz detection technology; YBCO superconductors
• ISSN: 2053-1591
• DOI: 10.1088/2053-1591/ac3693

We designed, fabricated, and characterized microwave transmission properties with rewound strip structures for YBa2Cu3O7 (YBCO)-based kinetic inductance detectors (KIDs). The superconducting rewound strip serves as a microwave resonator and as a broadband terahertz-wave antenna. To predict the microwave resonance characteristics before fabrication, the line-width (w) and space (s) dependence of the spiral resonators were analyzed using an electromagnetic simulator; the resonance frequency increased, and the quality factor decreased with increasing w and s from 10 to 40 μm. YBCO-based KID arrays with different w (10 and 40 μm) were fabricated on 10 mm-square MgO substrates, cooled to 3 K using a 4He refrigerator, and evaluated using a vector network analyzer to verify the result of the simulation experimentally. The measured resonance frequency ratio of 1.11 times (5.04 → 5.59 GHz) agreed with the simulated ones of 1.10 times (4.84 → 5.33 GHz) between w = 10 and 40 μm. The other resonance characteristics, such as transmission coefficient and quality factor, have a similar w dependence with the simulation.