Realizing an ultra-wideband backward-wave metamaterial waveguide

Electroinductive waves have emerged as an attractive solution for designing metamaterials that support backward propagating waves. Stacked metasurfaces etched with complementary split-ring resonators (CSRRs) have also been shown to exhibit a broadband negative dispersion. We demonstrate, through exp...

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Bibliographic Details
Published in:Physical review. B 2018-12, Vol.98 (23), p.1, Article 235408
Main Authors: Seetharaman, S. S., Tremain, B., Barnes, W. L., Hooper, I. R.
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
Dipoles
Mathematical models
Metamaterials
Ultrawideband
Wave propagation
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Summary:Electroinductive waves have emerged as an attractive solution for designing metamaterials that support backward propagating waves. Stacked metasurfaces etched with complementary split-ring resonators (CSRRs) have also been shown to exhibit a broadband negative dispersion. We demonstrate, through experiment and numerical modeling, that the operational bandwidth of a CSRR metamaterial waveguide can be improved by restricting cross-polarization effects in the constituent meta-atoms. We report a fractional bandwidth of > 56%, which, to the best of our knowledge, is broader than any previously reported value for an electroinductive metamaterial. We present a traditional coupled-dipole toy model as a tool to understand the field interactions in CSRR-based metamaterials, and to explain the origin of their negative dispersion response.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.235408