Fig. 1. Laser-treated Al and Ni plates exhibit lotus effect for water regarding multiple random droplets on the laser-treated (a) Al and (b) Ni plates; measured CA of original (c) Al and (d) Ni plates; measured CA of femtosecond-laser-treated (e) Al and (f) Ni plates.

Fig. 2. Wavelength-dependent reflectance of samples surfaces before and after femtosecond laser processing.

Fig. 3. SEM images of modified surfaces of Al and Ni by femtosecond laser: (a) and (b) for Al; (c) and (d) for Ni.

Fig. 4. Size distribution of mirocolumns on laser-treated Al and Ni surfaces.

Fig. 5. (a) Photo and (b) SEM image of nanoscale surface structures, Al sample.

Fig. 6. Cross sectional SEM image of the laser-treated Al sample. EDS for analyzing elemental composition represents typical results taken on the laser-generated structural surface and the untreated area (cross section of the Al sample).