Fig. 4
(Reprinted with permission from Ref. [53])
The x–y cross section and EM energy density distribution \(w(\rho )\; [\text{J}/\text{m}^{3}]\) of a Ag plasmonic slot WG (PSW) with gap width g, b Si3N4 dielectric slot WG (DSW), c Ag-Si3N4 HM plasmonic slot WG (HMSW) with fm = 0.5 (Ag metal layers are shown as gray), and d Ag-Si3N4 hybrid plasmonic slot WG (HPSW). The color bar is in linear scale (normalized units), and each plot is individually normalized.