Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples
Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples
复制标题
用于超低损耗样品高分辨率宽带微波光谱的测辐射热技术
DOI：
10.1063/1.1633001
复制
发表时间：
2003
影响因子：
1.6
通讯作者：
W. Hardy
中科院分区：
文献类型：
--
作者：
P. Turner;D. Broun;S. Kamal;M. Hayden;J. Bobowski;R. Harris;D. C. Morgan;J. Preston;D. Bonn;W. Hardy
本文设计并实现了一种新的低温热量法，用于高精度测量吸收极低的小单晶血小板样品的微波表面电阻，并将其作为频率的连续函数。这种非谐振方法成功的关键是原位使用正常金属参考样品来校准绝对射频场强度。样品温度可以独立于1.2 K液氦浴控制，允许测量吸收的温度演变。然而，仪器的灵敏度在较高的温度下会下降，从而限制了有用的温度范围。使用该方法，在1.3 K下的最小可检测功率为1.5 pW，对应于典型的1 mm×1 mm血小板样品的表面电阻灵敏度≈1 μΩ。
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.