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research
Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples
Authors
J. S. Bobowski
D. A. Bonn
+8Â more
D. M. Broun
W. N. Hardy
R. Harris
M. E. Hayden
Saeid Kamal
D. C. Morgan
J. S. Preston
P. J. Turner
Publication date
15 July 2003
Publisher
'AIP Publishing'
Doi
Cite
View
on
arXiv
Abstract
A novel low temperature bolometric method has been devised and implemented for high-precision measurements of the microwave surface resistance of small single-crystal platelet samples having very low absorption, as a continuous function of frequency. The key to the success of this non-resonant method is the in-situ use of a normal metal reference sample that calibrates the absolute rf field strength. The sample temperature can be controlled independently of the 1.2 K liquid helium bath, allowing for measurements of the temperature evolution of the absorption. However, the instrument's sensitivity decreases at higher temperatures, placing a limit on the useful temperature range. Using this method, the minimum detectable power at 1.3 K is 1.5 pW, corresponding to a surface resistance sensitivity of
≈
\approx
≈
1
μ
Ω
\mu\Omega
μ
Ω
for a typical 1 mm
×
\times
×
1 mm platelet sample.Comment: 13 pages, 12 figures, submitted to Review of Scientific Instrument
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Last time updated on 04/12/2019