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 |
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Format: | Artikel |
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. |
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ISSN: | 0022-2291 1573-7357 |
DOI: | 10.1007/s10909-007-9684-3 |