Nanostructure Formation on Diamond-Like Carbon Films Induced with Few-Cycle Laser Pulses at Low Fluence from a Ti:Sapphire Laser Oscillator

Nanomaterials
Seiya NikaidoGodai Miyaji

Abstract

This study reports the results of experiments on periodic nanostructure formation on diamond-like carbon (DLC) films induced with 800 nm, 7-femtosecond (fs) laser pulses at low fluence from a Ti:sapphire laser oscillator. It was demonstrated that 7-fs laser pulses with a high power density of 0.8⁻2 TW/cm² at a low fluence of 5⁻12 mJ/cm² can form a periodic nanostructure with a period of 60⁻80 nm on DLC films. The period decreases with increasing fluence of the laser pulses. The experimental results and calculations for a model target show that 7-fs pulses can produce a thinner metal-like layer on the DLC film through a nonlinear optical absorption process compared with that produced with 100-fs pulses, creating a finer nanostructure via plasmonic near-field ablation.

References

Sep 15, 1992·Physical Review. B, Condensed Matter·M YoshikawaI Nagai
Apr 5, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Esther RebollarMarta Castillejo
Mar 19, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Esther RebollarTiberio A Ezquerra

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