Open AccessNanoneedle formation via doughnut beam-induced Marangoni effects
Author(s) -
Mamoru Tamura,
Takashige Omatsu,
Takuya Iida
Publication year - 2022
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.460962
Subject(s) - marangoni effect , materials science , nanoneedle , optics , nanosecond , nano , beam (structure) , radius , diffraction , nanostructure , optical vortex , light beam , angular momentum , optoelectronics , nanotechnology , laser , physics , convection , mechanics , composite material , computer security , quantum mechanics , computer science
Recently, nanosecond pulsed optical vortices enables the production of a unique chiral and sharp needle-like nanostructure (nano-needle). However, the formation process of these structures has been unsolved although mass transport by angular momentum would contribute to the chirality. Here, we reveal that another key factor in the formation of a sharp nano-needle is the Marangoni effect during the melting condition at high temperature. Remarkably, the thickness and height of the nano-needle can be precisely controlled within 200 nm, corresponding to 1/25 of beam radius (5 µm) beyond the diffraction limit by ring-shaped inhomogeneous temperature rise. Our finding will facilitate the development of advanced nano-processing with a variety of structured light beams.