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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 4 — Feb. 15, 2012
  • pp: 677–679

Effects of the amorphous layer on laser-induced subwavelength structures on carbon allotropes

Min Huang, Fuli Zhao, Ya Cheng, and Zhizhan Xu  »View Author Affiliations

Optics Letters, Vol. 37, Issue 4, pp. 677-679 (2012)

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By micro-Raman spectroscopy, we show that the structured surfaces of highly oriented pyrolytic graphite and diamond induced by 800 nm, 125 fs or 532 nm, 30 ps laser pulses are capped by thin amorphous carbon layers. Based on the results, we propose that for multiphoton ablation the thin amorphous layer with a reduced bandgap can facilitate surface ionization, raise free electron density, bring on plasmonic effects, and thus promote the growth of subwavelength structures. Therefore, concerning multipulse laser ablation of wide bandgap materials, we should take into account the effects of the superficial amorphous layer produced by preceding pulses instead of the intrinsic surface.

© 2012 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(140.3390) Lasers and laser optics : Laser materials processing
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Lasers and Laser Optics

Original Manuscript: July 22, 2011
Revised Manuscript: November 4, 2011
Manuscript Accepted: December 15, 2011
Published: February 14, 2012

Min Huang, Fuli Zhao, Ya Cheng, and Zhizhan Xu, "Effects of the amorphous layer on laser-induced subwavelength structures on carbon allotropes," Opt. Lett. 37, 677-679 (2012)

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