Single Superconducting Split-Ring Resonator Electrodynamics

Abstract

We investigate the microwave electrodynamic properties of a single superconducting thin film split-ring resonator (SRR). The experiments were performed in an all-Nb waveguide, with Nb wires and Nb SRRs. Transmission data showed a high-Q stopband for a single Nb SRR ($Q\sim 4.5\times 10^4$ at 4.2 K) below $T_c$, and no such feature for a Cu SRR, or closed Nb loops, of similar dimensions. 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 ($Q\sim 2.26\times 10^4$ at 4.2 K). Changes in the features due to the superconducting kinetic inductance were observed. Models for the SRR permeability, and the wire dielectric response, were used to fit the data.

4 pages, 3 figures, RevTex, submitted to Applied Physics Letters. Updated version includes mention of bianisotropy, better looking figures, and different temperature data

References in corpus (4)

• Limitations on Sub-Diffraction Imaging with a Negative Refractive Index Slab
• Effective medium theory of left-handed materials
• Superconducting Metamaterials
• Universal Features of the Time Evolution of Evanescent Modes in a Left-Handed Perfect Lens

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