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Researchers used structured light fields from q-plates to create complex surface patterns on silicon using ultrashort laser pulses. Tuning the q-plate

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Area of Science:

  • Physics
  • Materials Science
  • Optics

Background:

  • Ultrashort laser ablation is a key technique for material surface modification.
  • Structured light fields offer advanced control over laser-matter interactions.

Purpose of the Study:

  • To investigate ultrashort laser surface structuring using structured light fields generated by q-plates.
  • To explore the relationship between vector vortex beam characteristics and resulting surface structures.

Main Methods:

  • Generation of femtosecond (fs) vector vortex beams using q-plates with topological charges q=1, 3/2, 2, 5/2.
  • Multi-pulse ablation of crystalline silicon targets.
  • Optical retardation tuning of q-plates to control beam fluence distribution.

Main Results:

  • Complex periodic surface structures were formed on silicon.
  • The shape of the surface structures was dependent on the q-plate's topological charge (q).
  • A correlation was established between beam characteristics and surface structure features.

Conclusions:

  • Optical retardation tuning of q-plates provides a method to control laser fluence distribution.
  • Femtosecond complex light beams enable the design of unconventional surface structures.
  • This research offers a valuable route for advanced surface engineering.