Table 2 Optimal designs hosting the least lossy (minimal \(\tan \delta =|\textrm{Im}[\beta ]|/\textrm{Re}[\beta ]\)) surface plasmons. The enhancement metric \(Q=|\textbf{H}(0)|^2/|\textbf{H}(-h_1)|^2\) from (3), is optimized. Gray boxes correspond to poor performance Q.

From: In the quest of lossless slow light at surface plasmons

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