Feedback-Driven Plasmonic-Thermal Route to Femtosecond-Laser-Induced Periodic Surface Structures in Silicon Indicated by Pump-Probe Scattering and Diffraction

摘要: The self-organized formation of nanoscale laser-induced periodic surface structures (LIPSS) is still not fully understood with respect to the dynamics and interplay contributing complex mechanisms. transition from randomness order specific role nano-feedback are fundamental interest because their general aspects. In our study, very first steps reconfiguration demonstrated by analyzing topology evolving nano-crater maps. evolution spatial frequencies directional arrangement indicate a feedback-driven adaptation k-vectors required excitation conditions elementary dipoles in linearly polarized laser field. time-dependent structure was studied pump-probe diffraction scattering experiments. ratio contributions characteristic light patterns enables plasmonic non-plasmonic mechanisms be distinguished, which subsequently act at distinctly different time scales. Recently developed multistage models for material modification confirmed. influence accumulation effects clearly changes an increasing number preceding pulses. It assumed that thermal coupled thus generate spatially variable modifications.