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

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

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jltp..151..524b&link_type=abstract

Journal of Low Temperature Physics, Volume 151, Issue 1-2, pp. 524-529

Physics

18

Scientific paper

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 {}=9× 10^{-18} W/sqrt{Hz} 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 {}=3×10^{-18} W/sqrt{Hz} 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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