Figure 3.

Dependence of the normalized Z component of the electric field near the end of the grating on the grating amplitude $x_0$ for the resonant SPP excitation, $\lambda =800$ nm. The dashed line shows the analytical dependence; the dots represent the numerical calculations. For both cases, the total length of the grating is kept constant and equal to 400.5 grating periods (≈313 $\mathsf{\mu }$m).