2005/03/31 by Michael Ricci, Nathan D. Orloff, Nathan Orloff +1
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Antenna Design and Analysis #Metamaterials and Metasurfaces Applications #cond-mat.supr-con
paper · pdf · doi:10.1063/1.1996844
published as Appl. Phys. Lett. 87, 034102 (2005) · 3 pages, 3 figures, submitted to Applied Physics Letters in December 2004, new/better composite data, now includes loss estimates
arxiv created 2005/04/29 · openalex publication_date 2005/07/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 297K. Evidence of negative effective permittivity, permeability, and a negative effective index passband are seen in the superconducting state between 50MHz and 18GHz. We find a dielectric loss of εeff,2=2.6×10−3 in a superconducting wire array at 10.75GHz.