Laser-induced surface relief nanocrowns as a manifestation of nanoscale Rayleigh-Plateau hydrodynamic instability

TL;DR

This study investigates laser-induced nanocrowns formed on gold films, revealing their Rayleigh-Plateau hydrodynamic instability origin and suggesting laser ablation as a cost-effective method to study nanoscale fluid instabilities.

Contribution

It demonstrates that laser-induced nanocrowns result from Rayleigh-Plateau instability, providing new insights into nanoscale hydrodynamics and proposing laser ablation as a practical experimental approach.

Findings

Nanocrowns' characteristics depend on laser energy and film thickness.

The instability exhibits Rayleigh-Plateau behavior over other possible mechanisms.

Laser ablation offers a simple method to study nanoscale hydrodynamic phenomena.

Abstract

Nanoscale hydrodynamic instability of ring-like molten rims around ablative microholes produced in nanometer-thick gold films by tightly focused nanosecond-laser pulses was experimentally explored in terms of laser pulse energy and film thickness. These parametric dependencies of basic instability characteristics - order and period of the resulting nanocrowns - were analyzed, revealing its apparently Rayleigh-Plateau character, as compared to much less consistent possible van der Waals and impact origins. Along with fundamental importance, these findings will put forward pulsed laser ablation as an alternative facile inexpensive table-top approach to study such hydrodynamic instabilities developing at nanosecond temporal and nanometer spatial scales.