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Full-Color Femtosecond Laser Painting on Titanium Films at 35000 DPI Resolution.

Vasily Lapidas1, Aleksandr V Shevlyagin1, Alexey Yu Zhizhchenko1

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The Journal of Physical Chemistry Letters
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Summary
This summary is machine-generated.

High-resolution structural coloring of titanium films was achieved using femtosecond laser pulses. Near-IR light offers better color control and vividness, while visible light provides higher resolution for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Structural coloring offers a method for creating vibrant colors without pigments.
  • Titanium (Ti) thin films are suitable for creating color through controlled oxidation.
  • Femtosecond laser irradiation enables precise material modification at the nanoscale.

Purpose of the Study:

  • To demonstrate high-resolution structural coloring on titanium thin films.
  • To investigate the effects of visible and near-infrared (NIR) femtosecond laser wavelengths on color generation.
  • To explore applications in scalable coloring and information encryption.

Main Methods:

  • Fabrication of a Ti-TiO2-Ti multilayer structure.
  • Irradiation of titanium films using femtosecond lasers at 515 nm (visible) and 1030 nm (NIR).
  • Optical simulations to analyze absorption profiles and color formation mechanisms.

Main Results:

  • Achieved full-spectrum structural coloring with sub-500 nm feature size and up to 35000 dpi resolution.
  • Identified a trade-off between visible light (higher resolution) and NIR light (better color control and vividness).
  • NIR light demonstrated a more homogeneous absorption profile, leading to superior color quality.

Conclusions:

  • Femtosecond laser irradiation is a viable technique for high-resolution structural coloring of titanium films.
  • Wavelength selection (visible vs. NIR) critically impacts resolution and color properties.
  • The developed method is applicable for scalable multilevel coloring and secure information encryption via nanogratings.