Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.50: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Kinetic Inductance Detectors Based On Quarter Wavelength Resonators — •Gerd Hammer, Stefan Wünsch, Konstantin Ilin, and Michael Siegel — Institut für Mikro- und Nanoelektronische Systeme, Universität Karlsruhe (TH), Karlsruhe, Deutschland
Quarter wavelength resonators with high-Q values as core part of a complete readout system for kinetic inductance detectors opens the possibility of a extremely sensitive measurement method for radiation in a wide spectral range. Absorbted radiation causes a change of quasiparticle density and subsequently to a change of kinetic inductance of the resonator. This results in a detuning of the cavity circuit which can be detected by measurement of amplitude or phase. Superconducting thin-film niobium resonators with different geometries in coplanar waveguide topology for 6 GHz were developed, fabricated and measured. Simulation and measurement results of the quality factors QR show strong influences of the coupling capacitances and has to be optimized. Measurements at cryogenic temperatures with quality factors QR in the range of 105 − 106 were achieved in a temperature range of 4 K to 8 K.