Tunable negative permeability in a three-dimensional superconducting metamaterial
Tunable negative permeability in a three-dimensional superconducting metamaterial
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DOI：
10.1103/physrevapplied.3.054010
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发表时间：
2015-01
期刊：
影响因子：
--
通讯作者：
C. Kurter;T. Lan;L. Sarytchev;S. Anlage
中科院分区：
文献类型：
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作者：
C. Kurter;T. Lan;L. Sarytchev;S. Anlage
我们报道了一种由超导薄膜螺旋谐振器制成的低损耗、紧凑的三维（3D）超材料的高调谐射频（rf）特性。的超材料的单个元素的射频传输频谱显示在24.95 MHz的基本共振峰，移动到一个25$\%$更小的频率，并成为退化时，这样的元素的3D阵列创建。超材料显示了一个可调的窄频带，其中的有效磁导率的真实的部分是负的在很宽的温度范围内，这逐渐恢复到接近零和正值的超导临界温度接近。这种超材料可用于提高电小型射频天线的功率传输效率和可调谐性。
We report on highly tunable radio frequency (rf) characteristics of a low-loss and compact three dimensional (3D) metamaterial made of superconducting thin film spiral resonators. The rf transmission spectrum of a single element of the metamaterial shows a fundamental resonance peak at $\sim$24.95 MHz that shifts to a 25$\%$ smaller frequency and becomes degenerate when a 3D array of such elements is created. The metamaterial shows an $\emph{in-situ}$ tunable narrow frequency band in which the real part of the effective permeability is negative over a wide range of temperature, which reverts to gradually near-zero and positive values as the superconducting critical temperature is approached. This metamaterial can be used for increasing power transfer efficiency and tunability of electrically small rf-antennas.