843624.fig.005a
(a)
843624.fig.005b
(b)
843624.fig.005c
(c)
843624.fig.005d
(d)
Figure 5: Near-field measurements of the surface illumination when the dipoles resonating are radiating in free space(left column) and with the superstrate (right column). (a), (b) Resonant frequency at . (c), (d) Resonant frequency at