SURFACE STRUCTURE AND METHOD FOR GENERATING A SURFACE STRUCTURE

摘要

The invention relates to a method for producing a surface structure comprising the following steps:
- providing a substrate having a surface to be treated;
- irradiating a portion of the surface with a beam of a pulsed ultra violet laser projecting a spot on the surface wherein the pulsed UV laser is having a pulse length of 5 to 10 picoseconds, and a pulse frequency of 200 to 300 kiloherz, wherein the energy density per pulse ranges from 0.003 to 0.5 microjoules per square micrometer;
- moving the spot over the surface to be treated;
- repeating the irradiation a number of times. The invention further relates to a surface structure wherein the structure comprises an open submicron structure having randomly placed protrusions of 0.1 to 10 micrometer in diameter and a roughness obtained by these protrusions of plus and minus 0.5 micron to plus minus 15 micrometer, in direction (z) perpendicular to the surface.