Superconducting Films for Absorber-Coupled MKID Detectors for Sub-Millimeter and Far-Infrared Astronomy
Abstract
We describe measurements of the properties, at dc, gigahertz, and terahertz frequencies, of thin (10 nm) aluminum films with 10 ohm/{rm square}$ normal state sheet resistance. Such films can be applied to construct microwave kinetic inductance detector arrays for submillimeter and far-infrared astronomical applications in which incident power excites quasiparticles directly in a superconducting resonator that is configured to present a matched-impedance to the high frequency radiation being detected. For films 10 nm thick, we report normal state sheet resistance, resistance-temperature curves for the superconducting transition, quality factor and kinetic inductance fraction for microwave resonators made from patterned films, and terahertz measurements of sheet impedance measured with a Fourier Transform Spectrometer. We compare properties with similar resonators made from niobium 600 nm thick.
Additional Information
© 2009 IEEE. Manuscript received August 16, 2008. First published June 16, 2009; current version published July 10, 2009. This work was supported in part by an award under NASA's ROSES-APRA program. The authors thank Ross Henry for FTS measurements of the aluminum films, and Christine Jhabvala and Mary Li for fabrication of the niobium resonators.Attached Files
Published - Stevenson2009p5548Ieee_T_Appl_Supercon.pdf
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Additional details
- Eprint ID
- 14892
- Resolver ID
- CaltechAUTHORS:20090808-142502351
- NASA
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2009-09-01Created from EPrint's datestamp field
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2021-11-08Created from EPrint's last_modified field