Simulation of rippled structure adjustments based on localized transient electron dynamics control by femtosecond laser pulse trains

Yanping Yuan, Lan Jiang, Xin Li, Cong Wang, Liangti Qu, Yongfeng Lu

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

This study investigates the effects of pulse energy distributions on subwavelength ripple structures (the ablation shapes and subwavelength ripples) using the plasma model with the consideration of laser particle-wave duality. In the case studies, the laser pulse (800 nm, 50 fs) trains consist of double pulses within a train with the energy ratios of 1:2, 1:1, and 2:1. Localized transient electron densities, material optical properties, and surface plasmon generation are strongly affected by the energy distributions. Hence, the adjustment of the ablation shape and subwavelength ripples can be achieved based on localized transient electron dynamics control during femtosecond laser pulse train processing of dielectrics. The simulation results show that better, more uniform structures, in terms of ablation shapes and subwavelength ripples, can be easily formed at a lower fluence or subpulse energy ratio of 1:1 with a fixed fluence. It is also found that pulse trains at a 1:1 energy ratio are preferred for drilling high-aspect-ratio microholes or microchannels.

Original languageEnglish (US)
Pages (from-to)813-819
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume111
Issue number3
DOIs
StatePublished - Jun 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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