Negative-refractive-index behavior in a periodic photonic metamaterial: unit-cell topology tailoring for broadband response | Journal of the European Optical Society-Rapid Publications

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Figure 10

(a) Variation of the group index distributions due to under/over-etching in Band 3. (b) Sensitivity of the response to relative permittivity variations ( $11.5 \leq ε_{r} \leq 12.5$ $Mathematical equation: $ 11.5\le {\epsilon }_r\le 12.5$$ ). The results demonstrate the robustness of the optimized 4 × 4 symmetric geometry against systematic fabrication-induced deviations across the considered wavelength range.

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