Design and Fabrication of Microwave Kinetic Inductance Detectors using NbN Symmetric Spiral Resonator Array
2014; IOP Publishing; Volume: 507; Issue: 4 Linguagem: Inglês
10.1088/1742-6596/507/4/042015
ISSN1742-6596
AutoresK. Hayashi, A. Saito, Yasunobu Ogawa, Michio Murata, Taisuke Sawada, Kensuke Nakajima, H. Yamada, Seiichiro Ariyoshi, Tohru Taino, Tanoue Hiroyuki, Chiko Otani, Shigetoshi Ohshima,
Tópico(s)Microwave Engineering and Waveguides
ResumoWe designed and fabricated a microwave kinetic inductance detector (MKID) using a niobium nitride (NbN) symmetric spiral resonator array. Previously we revealed that a rewound spiral structure works as not only a high-Q half-wavelength resonator but also as a broadband terahertz antenna. We conducted simulations for a 9 resonator array assuming NbN as the superconducting material and sapphire as the dielectric substrate, and obtained a maximum attenuation of over 30 dB and unloaded quality factors of over 2×105 for frequencies between 4.4 and 4.9 GHz. We fabricated the 9 resonator array MKID using NbN thin film deposited on an m-sapphire substrate by using dc magnetron sputtering. We observed half-wavelength resonances of around 4.5 GHz at 4 K. We measured the optical response of the MKID. The frequency shift was 0.5 MHz when illuminated with 650 nm photons.
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