Figure 4. Simulated near-field maps showing the z-component of the electric field within the x-y plane 1.5 mm above the upper surface of the corrugated metallic disk considered in Fig. 2.

Panels a to e (f to i) show the fundamental (second-order) spoof LSPs labelled as 1 to 5 (6 to 9) in Fig. 3. The colour scales are saturated in each case to make the field profiles more apparent.