Method and device for producing nano-structured surfaces

A method of producing nanostructured surfaces, the method comprising the following steps:

• providing an article having a surface to be structured;
• generating short-pulse laser radiation with laser pulses having pulse durations in a sub-nanosecond range;
• directing the short-pulse laser radiation onto the surface of the article to be structured,
• and thereby controlling the short-pulse laser radiation such that a fluence F of each individual pulse of the short-pulse laser radiation on the surface is less than a multishot threshold fluence Fth for a multishot laser ablation and the short-pulse laser radiation, by way of nonlinear effects, producing defects in the article that lead to a local compression of the article and a structuring of the surface.

An apparatus for producing a nanostructure surface on an article, comprising:

• a short-pulse laser for generating short-pulse laser radiation with laser pulses having pulse durations in a sub-nanosecond range;
• a mount for receiving the article having the surface to be structured;
• a beam guiding device for guiding the short-pulse laser radiation onto the surface to be structure;
• said short-pulse laser and said beam guiding device being configured such that a fluence F of each individual pulse of the short-pulse laser radiation (15) on the surface is less than a multishot threshold fluence Fth for a multishot laser ablation, but is high enough to produce defects in the article by way of nonlinear effects, the defects leading to a compression of the article and the structuring of the surface.