We report on experiments with superconducting metamaterials containing Josephson junctions. In these structures, split-ring resonators used in conventional metamaterials are replaced by superconducting loops that are interrupted by Josephson junctions, so called rf-SQUIDs. Like the split-ring resonators, these elements can be seen as LC-resonators that couple to the magnetic field. The advantage of superconducting thin-film metamaterials is that, due to the tunable intrinsic inductance of the Josephson junction, the resonance frequency of the rf-SQUID can be changed by applying an external dc magnetic field. We present experimental results that demonstrate the tunability of the resonance frequency of these devices.
@article{arxiv.1301.0440,
title = {Low-loss tunable metamaterials using superconducting circuits with Josephson junctions},
author = {Philipp Jung and Susanne Butz and Sergey V. Shitov and Alexey V. Ustinov},
journal= {arXiv preprint arXiv:1301.0440},
year = {2013}
}