Impact of film thickness in laser-induced periodic structures on amorphous Si films

https://phys.org/news/2023-07-impact-thickness-laser-induced-periodic-amorphous.html

"periodic grating induced on surface thin a-Si film, grating period affected by incident light interference  with different electromagnetic wave origins... thickness 50 nm, substrate non-silicon material. LIPSS small period induced under dominance of slab waveguide mode... substrate material changes then period of LIPSS also changes... thickness 200 nm then incident light interferes quasi-cylindrical wave, induces LIPSS growth under near and far field action. Finite-difference time-domain method-based numerical simulations"