Phys.org January 24, 2023
Most studies using the GHz burst mode femtosecond laser pulses focus on ablation of materials to achieve high-efficiency and high-quality material removal. Researchers in Japan explored the ability of the GHz burst mode femtosecond laser processing to form laser-induced periodic surface structures (LIPSS) on silicon. The direction of LIPSS formed by the single-pulse mode with linearly polarized laser pulses is typically perpendicular to the laser polarization direction. They showed that the GHz burst mode femtosecond laser created unique two-dimensional LIPSS. The team has proposed a possible mechanism for the formation of 2D LIPSS formed by the GHz burst mode, which is regarded as the synergetic contribution of the electromagnetic and hydrodynamic mechanisms. Specifically, the generation of hotspots with highly enhanced electric fields by the localized surface plasmon resonance of subsequent pulses in the bursts within the nanogrooves of 1D LIPSS formed by the preceding pulses creates 2D LIPSS. read more… Open Access TECHNICAL ARTICLEÂ
Schematic illustration of the experimental setup for LIPSS formation… Credit: International Journal of Extreme Manufacturing 2023, 5 015004.Â