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Summary: Single superconducting split-ring resonator electrodynamics
Michael C. Ricci and Steven M. Anlage
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park,
Maryland 20742-4111
Received 20 December 2005; accepted 11 May 2006; published online 26 June 2006
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 4.5 104
at 4.2 K below Tc, 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 2.26 104
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. © 2006 American Institute of
Physics. DOI: 10.1063/1.2216931
Since the end of the last century, many researchers have
been interested in verifying predictions by Veselago1
for ma-
terials with a simultaneously negative permittivity and
permeability . Such materials have a negative index of
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