Structures with negative index of refraction
- Ames, IA
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.
- Research Organization:
- Iowa State University Research Foundation, Inc. (Ames, IA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- Assignee:
- Iowa State University Research Foundation, Inc. (Ames, IA)
- Patent Number(s):
- 8,054,146
- Application Number:
- 11/559,562
- OSTI ID:
- 1033605
- Country of Publication:
- United States
- Language:
- English
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