Sub-100-nm periodic nanostructure formation induced by short-range surface plasmon polaritons excited with few-cycle laser pulses
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-11-08 |
| Journal | Journal of Applied Physics |
| Authors | Yuto Iida, Seiya Nikaido, Godai Miyaji |
| Institutions | Tokyo University of Agriculture and Technology |
| Citations | 13 |
Abstract
Section titled āAbstractāWe have demonstrated that intense 7-fs, ā¼810-nm laser pulses can produce a much finer periodic nanostructure on a diamond-like carbon film through ablation in air than that formed with intense 100-fs, ā¼800-nm laser pulses. The minimum period size is ā¼60 nm, corresponding to ā¼1/13 of the center wavelength. To understand the physical mechanism responsible for the finer nanostructuring, we have observed a bonding structural change in the nanostructure with micro-Raman spectroscopy and a scanning transmission electron microscope. It has been found that the modified layer thickness with the 7-fs pulses is much thinner than that with the 100-fs pulses. The results show that the 7-fs pulses create a few-nm-thick layer with high-density electrons and excite short-range surface plasmon polaritons, which have a large wave number around the layer and induce the plasmonic near-field nanoablation. The period size estimated by using a model target reproduces well the observed size of nanostructures.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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