Recently, chiral mass transfer on the surface of plasmonic-active metals appeared upon their ablation with vortex laser pulses was 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 using of perfect optical vortices with different topological charges for direct single-pulse laser ablation of noble-metal films don't allow to change the helicity of produced nanoneedles (also called nanojets). Meanwhile, the chirality of laser-induced nanojets can be tuned in a wide range of parameter by properly designing and tailoring the spiral-shape intensity patterns. Such optimization of the laser intensity profile governing the helical movement of the transiently molten metal allows to produce nanostructures with controlled chirality suited for various nanophotonics and biosensing applications.
Sergey A. Syubaev, Aleksandr A. Kuchmizhak, and Aleksey P. Porfirev, "Laser fabrication of plasmonic nanostructures with controllable chirality by spiral-shape and vortex beams," Proc. SPIE 10907, Synthesis and Photonics of Nanoscale Materials XVI, 109070R (Presented at SPIE LASE: February 03, 2019; Published: 4 March 2019); https://doi.org/10.1117/12.2507382.
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