Chiral Patterning of Rough Surfaces with Vortex Laser Beams: From Structured Polarization to Twisted Forces

The ability to create surface structures with precisely controlled chirality remains a major challenge in laser‐matter interaction experiments. In this work, the interaction of vortex laser beams, characterized by spiral polarization patterns and twisted wavefronts, with rough metallic surfaces in order to create surface patterns with chirality is theoretically studied. Using numerical simulations based on the finite‐difference time‐domain method, how spin and orbital angular momenta influence the inhomogeneous energy absorption at the surface is investigated and twisted optical forces that can drive topographic reorganization are generated. How different structured light fields can create intricate patterns with chiral features on a material surface is shown. The crucial role of polarization and spatial inhomogeneity of the light field in the generation of asymmetric torque forces that directly affect the surface dynamics is emphasized. The electromagnetic simulations show how vortex beams can be used to create chiral surface structures, expanding the knowledge of laser‐generated periodic surface structures and opening up new possibilities for chiral surface engineering.