Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-08
Physical Review Letters 105, 247402 (2010)
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures, submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.105.247402
In this Letter we present resonance properties in terahertz metamaterials consisting of a split-ring resonator array made from high temperature superconducting films. By varying the temperature, we observed efficient metamaterial resonance switching and frequency tuning with some features not revealed before. The results were well reproduced by numerical simulations of metamaterial resonance using the experimentally measured complex conductivity of the superconducting film. We developed a theoretical model that explains the tuning features, which takes into account the resistive resonance damping and additional split-ring inductance contributed from both the real and imaginary parts of the temperature-dependent complex conductivity. The theoretical model further predicted more efficient resonance switching and frequency shifting in metamaterials consisting of a thinner superconducting split-ring resonator array, which were also verified in experiments.
Azad Abul K.
Chen Hou-Tong
Jia Q. X.
O'Hara John F.
Singh Ranjan
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