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Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic

Daisuke Nakamura1, Ryohei Tasaki2, Miki Kawamoto2

  • 1Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. dnakamura@ees.kyushu-u.ac.jp.

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Researchers simulated optical vortex pulse ablation to create microcone structures on silicon. This method successfully formed a 3.5 µm twisted cone, demonstrating precise laser-material interaction control for microfabrication.

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Area of Science:

  • Materials Science
  • Laser Physics
  • Computational Physics

Background:

  • Microfabrication techniques are crucial for advanced materials.
  • Laser ablation offers precise material modification capabilities.
  • Optical vortex pulses present unique properties for material processing.

Purpose of the Study:

  • To simulate the formation of microcone structures on silicon (Si) substrates using optical vortex pulse ablation.
  • To investigate the role of laser-material interactions and plasma shielding in the ablation process.
  • To validate simulation results against experimental observations.

Main Methods:

  • Radiation hydrodynamic simulation of laser-material interaction.
  • Modeling of optical vortex pulse ablation on silicon substrates.
  • Two-dimensional (2-D) simulation to analyze plasma shielding effects.

Main Results:

  • Successfully simulated the formation of doughnut-shaped craters and a central twisted cone structure (3 µm height) on silicon.
  • Observed that plasma shielding reduced the central laser power, influencing the ablation profile.
  • Demonstrated the survival of the acute tip shape of the silicon surface during laser irradiation.

Conclusions:

  • Radiation hydrodynamic simulations accurately reproduce microcone structures formed by optical vortex pulse ablation.
  • Plasma shielding is a significant factor affecting laser power distribution and ablation morphology.
  • Optical vortex pulses enable controlled fabrication of microstructures on silicon surfaces.