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Optical near fields for ablation of periodic structures
- Source :
- Optics Letters. 48:2841
- Publication Year :
- 2023
- Publisher :
- Optica Publishing Group, 2023.
-
Abstract
- The formation mechanism of laser-induced periodic surface structures (LIPSS) has been a key to high-resolution sub-diffraction lithography or high-efficiency large-area nanotexturing. We show the evolution of LIPSS formation from a nanohole seed structure to high-spatial-frequency LIPSS by using a tightly focused and rectangular-shaped laser beam with different shape–polarization orientations. Formation of LIPSS based on light intensity distribution without invoking any long-range electromagnetic modes achieved quantitative match between modeling and experiment. Our results clearly show the entire step-like and deterministic process of LIPSS evolution based on experimental data and numerical simulations, revealing the dominant structural near-field enhancement on the ripple formation. A rectangular-shaped beam with an aspect ratio of 7:3 was used to break the symmetry of a circularly shaped focus. By azimuthally rotating the orientation of the focal spot and the polarization, it is possible to visualize the far-field effect for the initial seed structure formation and the competition between the far and near fields in the subsequent structure evolution.
- Subjects :
- Atomic and Molecular Physics, and Optics
Subjects
Details
- ISSN :
- 15394794 and 01469592
- Volume :
- 48
- Database :
- OpenAIRE
- Journal :
- Optics Letters
- Accession number :
- edsair.doi...........666dc0edaca0823e4d678c33e9a5a630
- Full Text :
- https://doi.org/10.1364/ol.487323