Abstract
Chiral mass transfer on the surface of plasmonic-active metals appeared upon their ablation with vortex laser pulses was recently found to be driven by a helical-shape temperature and corresponding surface tension gradients rather than optical angular momentum transfer from the incident beam. Here, we demonstrate that by properly designing and tailoring the spiral-shape intensity pattern used for direct single-pulse laser ablation, the chirality of produced nanoneedles can be controlled in a wide range of parameter. Such optimization of the laser intensity pattern governing the helical movement of the transiently molten metal allows to produce nanostructures with controlled chirality suited for various nanophotonics and biosensing applications.
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