Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples

P. J. Turner; D. M. Broun; Saeid Kamal; M. E. Hayden; J. S. Bobowski; R. Harris; D. C. Morgan; J. S. Preston; D. A. Bonn; W. N. Hardy

doi:10.1063/1.1633001

paper

Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples

arXiv:cond-mat/0307340 · doi:10.1063/1.1633001

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 $μ Ω$ for a typical 1 mm $\times$ 1 mm platelet sample.

arXiv comment13 pages, 12 figures, submitted to Review of Scientific Instruments

Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples

Abstract

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