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Development of High-Q Superconducting Resonators for use as Kinetic Inductance Detectors

Authors:
J.J.A. Baselmans, R. I3arends, S.J.C. Yates, J.N. Hovenier, J,R. Gao, H. Hoevers, T.M. Klapwijk
Abstract:
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 we have started the development of Microvvave Kinetic Inductance Detectors (MKIDs). 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 IVIKID is below NEP ~ 1 × 10-20 W/square root Hz, low enough for any envisionable application in the sub-mm, optical and X-ray wavelength ranges. We describe our initial experiments with these resonators, made of 100 mu Nb films on a high purity Si substrate. We 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. We furthermore obtain the responsivity of these resonators, with values up to 0.08 radians per 106 quasiparticles.
Categories:
Detectors, Superconductors
Year:
2006
Session:
8
Full-text:
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Page Number(s):
309-314