Femtosecond laser-induced ripple patterns for homogenous nanostructuring of pyrolytic carbon heart valve implant

摘要

Highlights•The formation of LIPSS under femtosecond laser irradiation on PyC is investigated.•The irradiation conditions of transition between HSFL and LSFL is shown.•Structures with periodicity smaller than 100 nm were obtained.•The most suitable parameters for uniform structuring large areas are established.•EDX and Raman spectroscopy are used to determine change in elemental composition.AbstractLaser-induced periodic surface structures (LIPSS) are highly periodic wavy surface features which are frequently smaller than incident light wavelength that bring possibility of nanostructuring of many materials. In this paper the possibility of using them to homogeneously structure the surface of artificial heart valve made of PyC was examined. By changing laser irradiation parameters such like energy density and pulse separation the most suitable conditions were established for 1030 nm wavelength. A wide spectrum of periodicities and geometries was obtained. Interesting side effects like creating a thin shell-like layer were observed. Modified surfaces were examined using EDX and Raman spectroscopy to determine change in elemental composition of surface.