Figure 5
Optical mode coupling and period dependent field confinement.
(a) shows mode dispersion with respect to the groove spacing (P-W) and Period, as well as the definition of even and odd modes in the insets. The field distribution of Hy with defined even and odd modes is plotted in (b) and (c), respectively. The intensity distribution of magnetic field Hy at the incident illumination angle of 45° is presented at P = 180 nm (d), 220 nm (e), 260 nm (f). (d) confirms that the field is well confined within the nano-groove corresponding to a MIMFP mode, while (d) and (f) show strong surface modes illustrating coupling to the GASP modes.
