One of the greatest challenges in the development of future space based instruments for sub-mm astronomy is the fabrication of sensitive and large detector arrays. Within this context the authors have started the development of Microwave Kinetic Inductance Detectors (MKEDs). The heart of each detector consists of a high Q superconducting quarter wavelength microwave resonator. As a result it is easy to multiplex the readout by frequency division multiplexing. The flexibility of the MKID allows for radiation detection from sub-mm to X ray by choosing a suitable radiation absorber or antenna. The predicted sensitivity of the MKID is below NEP about 1x10-20 W/Hz1/2, low enough for any envisionable application in the sub-mm, optical and X ray wavelength ranges. The authors describe their initial experiments with these resonators, made of 100 nm Nb films on a high purity Si substrate. The authors measure the Q factors of several resonators using a vector network analyzer and find Q factors up to 50000, limited by the intrinsic quality of the resonators. The authors furthermore obtain the responsivity of these resonators, with values up to 0.08 radians per 106 quasiparticles.
Development of high-Q superconducting resonators for use as kinetic inductance elements
Entwicklung supraleitender Resonatoren mit hohem Q-Faktor für den Einsatz als kinetische Induktionselemente
2006
7 Seiten, 3 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
Development of high-Q superconducting resonators for use as kinetic inductance detectors
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