Terahertz response of NbN-based microwave kinetic inductance detectors with rewound spiral resonator. (2nd February 2016)

• Record Type: Journal Article
• Authors: Ariyoshi, S; Nakajima, K; Saito, A; Taino, T; Otani, C; Yamada, H; Ohshima, S; Bae, J; Tanaka, S
• Is Part Of: Superconductor science & technology. Volume 29:Number 3(2016:Mar.)
• Publication Date: 2016-02-02
• Subjects: terahertz detection technology -- microwave kinetic inductance detector -- metal nitride superconductor; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/3/035012
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We have developed microwave kinetic inductance detectors (MKIDs) consisting of dual-purpose rewound spirals (spiral-MKIDs) made of a metal nitride superconductor for terahertz imaging applications. An NbN-based spiral-MKID array with 25 pixels was fabricated, and the fundamental performance of the terahertz receptivity was evaluated at the equilibrium temperature of a conventional 4 He refrigerator (≃3 K). The microwave transmission property of the array showed the 25 resonance lines, equally separated by frequency, in the microwave range from 2.70 to 2.95 GHz. To evaluate its optical performance as a terahertz detector, we measured the spiral-MKID's spectral response, response time, and noise equivalent power (NEP), and confirmed that it revealed a broad spectral response from 1 to 9 THz and an effective response time of approximately 80 μ s. The noise-equivalent power was estimated to be .