Figure 5

Reflection, E_x field and current distributions for lowest three orders FP modes. (a) Simulated reflection spectra for actual MPA structures with the spacer thickness of \({t}_{s1}=0.09\,\mu m\) (1^st order: black), \({t}_{s2}={t}_{s1}+{\lambda }_{s}/2=2.06\,\mu m\) (2^nd order: red) and \({t}_{s3}={t}_{s1}+{\lambda }_{s}=4.03\,\mu m\) (3^rd order: blue). (b) The corresponding reflection spectra for three-layer thin film model with spacer thickness \({t}_{s1}=0.09\,\mu m\), \({t}_{s2}=2.06\,\mu m\) and \({t}_{s3}=4.03\,\mu m\). Top views of current density on the cross-wire and MPG for (c) 1^st order, (d) 2^nd order and (e) 3^rd order MPA. Insets placed on the right side of (c)–(e) show the x-component of electric field \(({E}_{x})\) along z-direction (propagation direction). Current density on the meta-film representing cross-wire and the MGP for (f) 1^st order, (g) 2^nd order and (h) 3^rd order. Insets on the right side of (f)–(h) display \({E}_{x}\) along z-direction for the three-layer thin film structures.