2017/10/05 by Sergey Syubaev, Alexey Zhizhchenko, Syubaev, S. +13
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #Electrohydrodynamics and Fluid Dynamics #FOS: Physical sciences #Laser-Ablation Synthesis of Nanoparticles #Materials Science (cond-mat.mtrl-sci) #Optics (physics.optics) #Orbital Angular Momentum in Optics
paper · pdf · doi:10.48550/arxiv.1710.04271
openalex publication_date 2017/10/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Laser irradiation of various materials including metals, polymers and semiconductors with vortex beams was previously shown to twist transiently molten matter providing the direct easy-to-implement way to obtain chiral surface relief. Specifically for metals, this effect was attributed to transfer of an optical angular momentum (OAM) carrying by the vortex beam. In this Letter, we report the formation of twisted metal nanoneedles on the surface of silver and gold metal films under their irradiation with zero-OAM laser beam having spiral-shape lateral intensity distribution. Our comparative experiments clearly demonstrate, for the first time, that the formation process of chiral nanoneedles on the surface of plasmonic-active metals is mainly governed by the temperature-gradient induced chiral thermocapillary mass transfer rather that the OAM driven rotation of the transiently molten matter.