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SEM images of fs laser-induced structures formed on Ni surfaces upon irradiation with azimuthal (a–d), radial (e–h) and linear (i–l) polarization beams respectively, using φ = 0.24 J/cm2 and NP = 1000 (a,b,e,f,i,j) or NP = 100 (c,d,g,h,k,l). All pictures show top-views, except (b), (f), (j) that present 45-degrees views. Images (d), (h) and (l) are higher magnifications of the red-dashed-square areas.
