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Abstract
Superconducting Submillimeter and Millimeter Wave Detectors
by
Michael Nahum
Doctor of Philosophy in Physics
University of California at Berkeley
Professor P. L. Richards, Chair
The series of projects described in this dissertation was stimulated by the discovery of
high temperature superconductivity. Our goal was to develop useful applications which
would be competitive with the current state of technology. The high-T, microbolometer
was developed into the most sensitive direct detector of millimeter waves, when operated at
liquid nitrogen temperatures. The thermal boundary resistance of thin YBa2CuIO7. films
was subsequently measured and provided direct evidence for the bolometric response of
high-Tc films to fast (ns) laser pulses. The low-Tc microbolometer was developed and
used to make the first direct measurements of the frequency dependent optical efficiency of
planar lithographed antennas. The hot-electron microbolometer was invented less than a
year prior to the writing of this dissertation. Our analysis, presented here, indicates that it
should be possible to attain up to two orders of magnitude higher sensitivity than that of the
best available direct detectors when operated at the same temperature. The temperature
readout scheme for this device could also be used to measure the intrinsic interaction
between electrons and phonons in a metal with a sensitivity that is five orders of magnitude
better than in previous measurements. Preliminary measurements of quasiparticle trapping
effects at the interface between a metal and a superconductor are also presented.
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Nahum, M. Superconducting submillimeter and millimeter wave detectors, thesis or dissertation, October 20, 1992; California. (https://digital.library.unt.edu/ark:/67531/metadc1311365/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.