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Superconducting metamaterials Michael Ricci, Nathan Orloff, and Steven M. Anlagea
 

Summary: Superconducting metamaterials
Michael Ricci, Nathan Orloff, and Steven M. Anlagea
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park,
Maryland 20742
Received 17 December 2004; accepted 3 June 2005; published online 13 July 2005
Evanescent wave amplification has been predicted under the ideal condition that the index of
refraction, n=-1+i0 precisely, but is difficult to observe in practice because current metamaterials
suffer from high losses. We present experimental results on a metamaterial that employs
superconducting Nb metals and low-loss dielectric materials. Results include transmission data on
a wire, split-ring resonator, and a combination medium at temperatures between 4.2 and 297 K.
Evidence of negative effective permittivity, permeability, and a negative effective index passband
are seen in the superconducting state between 50 MHz and 18 GHz. We find a dielectric loss of
eff,2=2.6 10-3
in a superconducting wire array at 10.75 GHz. 2005 American Institute of
Physics. DOI: 10.1063/1.1996844
There has been renewed interest in the properties of ma-
terials with a negative index of refraction NIR , originally
proposed in 1967 by Veselago.1
Compelling experimental
evidence for this behavior has been seen through negative

  

Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park

 

Collections: Materials Science