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Hierarchical Micro-/Nano-Structures on Polycarbonate via UV Pulsed Laser Processing.

Marek Mezera1, Sabri Alamri2, Ward A P M Hendriks3

  • 1Department of Mechanics of Solids, Surfaces and Systems (MS3), Faculty of Engineering Technology, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands.

Nanomaterials (Basel, Switzerland)
|June 21, 2020
PubMed
Summary

Hierarchical micro/nanostructures were created on polycarbonate using a two-step laser process. Laser polarization direction critically influenced the nanoscale feature formation on microscale patterns.

Keywords:
Direct Laser Interference PatterningLaser-induced Periodic Surface Structureshierarchical structurespolycarbonatesurface functionalization

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Laser Processing

Background:

  • Polymer surfaces can be modified using laser-based techniques.
  • Creating hierarchical structures with features at multiple length scales is challenging.
  • Understanding laser-material interactions is crucial for controlled surface fabrication.

Purpose of the Study:

  • To fabricate hierarchical micro/nanostructures on polycarbonate surfaces.
  • To investigate the influence of laser polarization on surface morphology.
  • To analyze material modifications and degradation during laser processing.

Main Methods:

  • Two-step UV-laser processing combining Direct Laser Interference Patterning (DLIP) and Laser-induced Periodic Surface Structures (LIPSS).
  • Characterization using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM).
  • Optical intensity simulations using Finite-Difference Time-Domain (FDTD) calculations.
  • Chemical analysis via micro-Raman spectroscopy and ATR-FTIR spectroscopy.

Main Results:

  • Hierarchical micro/nanostructures were successfully fabricated on polycarbonate.
  • Laser polarization perpendicular to DLIP ridges enabled LIPSS formation on microstructures.
  • FDTD calculations indicated enhanced optical intensity at topographic maxima, explaining polarization dependence.
  • Polymer degradation increased with accumulated laser fluence.

Conclusions:

  • A two-step laser strategy effectively creates hierarchical structures on polymers.
  • Laser polarization is a key parameter controlling nanoscale feature formation on microscale patterns.
  • Optical field enhancement at surface features dictates polarization-dependent LIPSS formation.
  • Laser processing parameters must be optimized to balance structure formation and material degradation.