Evolution of LIPSS in the central area of the irradiated spot on Pt at : (a) the initial random nanoroughness is formed after ten shots (the inset shows the details of nanoroughness); (b) nanostructure-covered LIPSS after 30 shots (the inset shows magnified details).
Formation of LIPSS in the peripheral area of the irradiated spot on Pt at and : (a) general view of ablated spot; (b) the magnified details show that LIPSS disappears in the central area; (c) nanostructure-covered LIPSS with a period of in the peripheral area; (d) the magnified details of the marked region in (c).
AFM measurements of surface profile following (a) mechanical polishing and (b) ten laser shots.
A LIPSS profile measured with AFM following 30 laser shots.
Nanostructure-covered LIPSS with a period of in the central area of the irradiated spot on Au at and .
Nanostructure-covered LIPSS period in different areas of the irradiated spot on platinum at .
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