Abstract
Formation of a chiral nanorelief appearing on the surface of plasmonic-active metals upon their ablation with vortex and spiral-shape beam was recently found to be mainly driven by the helical-shape temperature and corresponding surface tension gradients rather than optical angular momentum transfer from the incident beam. Meanwhile, optimization of the laser intensity pattern driving the rotational movement of transiently molten metal allowing fabrication of surface structures with controlled chirality is still an actual task for various practical applications in nanophotonics and biosensing. Here, we show that by properly designing the intensity distribution in the spiral-shape beam used for direct laser ablation, the chirality of produced nanostructures can be controlled in a wide range of parameter.
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