Figure 3

SEM image of the groups of the silver nanoislands. SEM image of the part of the electrode (the net of 300 × 300-nm² apertures with 0.6-μm periodicity) used for glass poling (a), AFM images of the groups of silver nanoislands grown after annealing in hydrogen on the surface of the glass poled using this part of electrode (b), and AFM images of the groups of nanoislands grown after poling with another part with 5 μm in period net of 300 × 500-nm² apertures (c,d). The glass slide was ion-exchanged in the bath containing 5 wt.% of AgNO₃ and 85 wt.% of NaNO₃ at 325°C for 20 min, poled for 10 s at 300°C using 500 V and, finally, 3 min processed in hydrogen at 315°C.