METHOD OF MANUFACTURING NANOSTRUCTURES ON A SURFACE, ON A MOULD AND ON AN OPTICAL ELEMENT, AND AN OPTICAL ELEMENT AS SUCH MANUFACTURED

摘要

The present invention is directed to a method of manufacturing nanostructures on a surface of a metal substrate, comprising forming said nanostructures by means of a forming step, said forming step including subsequently performing at least once the steps of anodizing said surface of said substrate at a second voltage for forming at said surface an second oxidized metal layer comprising second pores; and performing an etching step on said surface for modifying the dimensions of said second pores; wherein prior to said forming step said method comprises a substrate preparation step for enabling the forming a mix of different sized nanostructures during said forming step, said preparation step including the steps of anodizing said surface at a first voltage for forming at said surface an first oxidized metal layer comprising first pores; selectively etching said surface for extending said first pores into said metal underneath said first oxidized metal layer; and removing said first oxidized metal layer.