Fabrication of Biomimetic 2D Nanostructures through Irradiation of Stainless Steel Surfaces with Double Femtosecond Pulses

Abstract

Femtosecond laser induced changes on the topography of stainless steel with double pulses is investigated to reveal the role of parameters such as the fluence, the energy dose and the interpulse delay on the features of the produced patterns. Our results indicate that short pulse separation (Δτ = 5 ps) favors the formation of 2D Low Spatially Frequency Laser Induced Periodic Surface Structures (LSFL) while longer interpulse delays (Δτ = 20 ps) lead to 2D High Spatially Frequency LIPSS (HSFL). The detailed investigation is complemented with an analysis of the produced surface patterns and characterization of their wetting and cell-adhesion properties. A correlation between the surface roughness and the contact angle is presented which confirms that topographies of variable roughness and complexity exhibit different wetting properties. Furthermore, our analysis indicates that patterns with different spatial characteristics demonstrate variable cell adhesion response which suggests that the methodology can be used as a strategy towards the fabrication of tailored surfaces for the development of functional implants.

Highly ordered laser imprinted plasmonic metasurfaces for polarization sensitive perfect absorption

“…As a result of this process, which we in more detail discuss in Ref. 12 , extended areas of nanowires are attained via proper scanning of the laser beam onto the film surface with the periodicity, shape and size of the LIPSS defined by polarization control and a proper combination of irradiation conditions 27,28,34,[36][37][38] . The experimental apparatus developed and used for the direct laser processing consists of an Yb:KGW Pharos-SP solid state laser (Light Conversion), emitting at = 513 nm central wavelength, the repetition rate of which was set to 60 kHz and the pulse width of 170 fs.…”

Nanopatterning of Bionic Materials

“…Herein, only original research articles have been considered for publication. The present Special Issue includes contributions on the following research topics: Functionalization of Ti-based medical implants by means of laser-induced micro- and nanostructures for cell repellence as well as for osteoblastic proliferation and differentiation [ 2 , 3 , 4 ]; Polymer surfaces with antimicrobiotic and antiadhesive properties induced by laser-induced periodic surface structures (LIPSS) in connection with nanofibers or nanowires [ 5 , 6 , 7 ]; The generation of novel hybrid carbon nanotube materials for biosensing applications by means of laser-induced forward transfer (LIFT) [ 8 ]. …”

“…Functionalization of Ti-based medical implants by means of laser-induced micro- and nanostructures for cell repellence as well as for osteoblastic proliferation and differentiation [ 2 , 3 , 4 ];…”