Abstract
Experimental results are presented on the formation of self-organized nanostructures(NSs) on a bulk Al target under its ablation in liquids—water and ethanol—withshort laser pulses from 180 femtoseconds (fs) through 350 picoseconds (ps). NSsare characterized by atomic force microscopy, field emission scanning electronmicroscopy, optical absorption spectroscopy and x-ray diffraction. The period of NSsdoes not depend on the laser wavelength used from 248 through 800 nm and isapproximately 200 nm. NSs on Al show the characteristic absorption peak in the nearUV which has been attributed to plasmon oscillation of electrons. The wings ofthis peak, extending to the visible, lead to a distinct yellow coloration of theprocessed Al surface. Ultrafast laser structuring of bulk aluminum in liquids may bepotentially a promising technique for efficient production of nanosized aluminum.
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