Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples Journal Articles uri icon

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  • 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 nonresonant 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 sensitivity of the instrument 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 ≈1 μΩ for a typical 1 mm×1 mm platelet sample.


  • Turner, PJ
  • Broun, DM
  • Kamal, Saeid
  • Hayden, ME
  • Bobowski, JS
  • Harris, R
  • Morgan, DC
  • Preston, John Stewart
  • Bonn, DA
  • Hardy, WN

publication date

  • January 1, 2004