Noise and Sensitivity of Aluminum Kinetic Inductance Detectors for Sub-mm Astronomy

Kinetic inductance detectors are based upon high Q superconducting resonators. We have measured the electrical Noise Equivalent Power (NEP) of 100 nm thick 1/4 λ coplanar waveguide Aluminum resonators at 100 mK using phase readout and radius readout. We find that the phase NEP is independent of the...

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Veröffentlicht in:Journal of low temperature physics 2008-04, Vol.151 (1-2), p.524-529
Hauptverfasser: Baselmans, J., Yates, S. J. C., Barends, R., Lankwarden, Y. J. Y., Gao, J. R., Hoevers, H., Klapwijk, T. M.
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Sprache:eng
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Zusammenfassung:Kinetic inductance detectors are based upon high Q superconducting resonators. We have measured the electrical Noise Equivalent Power (NEP) of 100 nm thick 1/4 λ coplanar waveguide Aluminum resonators at 100 mK using phase readout and radius readout. We find that the phase NEP is independent of the Q factor of the resonator, limited by excess noise in the KID and given by NEP at 100 Hz. It increases with roughly f −0.5 at lower frequencies. The amplitude NEP is strongly Q factor dependent, limited by the setup noise, nearly frequency independent and as low as NEP for a high Q resonator (Q=454.000). For lower Q resonators the amplitude NEP increases to values equal to or even larger than the phase readout.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-007-9684-3