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We have prepared meta-atoms based on radio frequency superconducting quantuminterference devices (RF SQUIDs) and examined their tunability with dc magneticfield, rf current, and temperature. RF SQUIDs are superconducting split ringresonators in which the usual capacitance is supplemented with a Josephsonjunction, which introduces strong nonlinearity in the rf properties. We findexcellent agreement between the data and a model which regards the Josephsonjunction as the resistively and capacitively-shunted junction. A magnetic fieldtunability of 80 THz/Gauss at 12 GHz is observed, a total tunability of 56$%$is achieved, and a unique electromagnetically-induced transparency feature atintermediate excitation powers is demonstrated for the first time. An RF SQUIDmetamaterial is shown to have qualitatively the same behavior as a single RFSQUID with regards to DC flux and temperature tuning.

Realization and modeling of rf superconducting quantum interference device metamaterials