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Structures with negative index of refraction

United States Patent

November 8, 2011
View the Complete Patent at the US Patent & Trademark Office
Ames Laboratory - Visit the Iowa State University Research Foundation - Office of Intellectual Property & Technology Transfer Website
Structures with Negative Refractive Index for Applications in Optics and Nanophotonics
The invention provides simplified negative index materials (NIMs) using wire-pair structures, 4-gap single ring split-ring resonator (SRR), fishnet structures and overleaf capacitor SRR. In the wire-pair arrangement, a pair of short parallel wires and continuous wires are used. In the 4-gap single-ring SRR, the SRRs are centered on the faces of a cubic unit cell combined with a continuous wire type resonator. Combining both elements creates a frequency band where the metamaterial is transparent with simultaneously negative .di-elect cons. and .mu.. In the fishnet structure, a metallic mesh on both sides of the dielectric spacer is used. The overleaf capacitor SRR changes the gap capacities to small plate capacitors by making the sections of the SRR ring overlap at the gaps separated by a thin dielectric film. This technique is applicable to conventional SRR gaps but it best deploys for the 4-gap single-ring structures.
Soukoulis; Costas M. (Ames, IA), Zhou; Jiangfeng (Ames, IA), Koschny; Thomas (Ames, IA), Zhang; Lei (Ames, IA), Tuttle; Gary (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
11/ 559,562
November 14, 2006
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made in part with Government support under Contract Number W-7405-ENG-82 awarded by the Department of Energy and under Contract Number MDA972-01-2-0016 awarded by DARPA. The Government may have certain rights in this invention.