Single superconducting split-ring resonator electrodynamics

We investigate the microwave electrodynamic properties of a single superconducting thin film split-ring resonator (SRR). Transmission data showed a high-Q stop band for a single Nb SRR (Q similar to 4.5x10(4) at 4.2 K) below T-c, and no such feature for a Cu SRR or closed Nb loops. Adding SRRs increased the bandwidth, but decreased the insertion loss of the features. Placing the Nb SRR into an array of wires produced a single, elementary negative-index passband (Q similar to 2.26x10(4) at 4.2 K). Changes in the features due to the kinetic inductance were observed. Models for SRR permeability and wire dielectric response were used to fit the data.