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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 18 — Sep. 9, 2013
  • pp: 21485–21490

Colloidal particle lens arrays-assisted nano-patterning by harmonics of a femtosecond laser

N. Bityurin, A. Afanasiev, V. Bredikhin, A. Alexandrov, N. Agareva, A. Pikulin, I. Ilyakov, B. Shishkin, and R. Akhmedzhanov  »View Author Affiliations


Optics Express, Vol. 21, Issue 18, pp. 21485-21490 (2013)
http://dx.doi.org/10.1364/OE.21.021485


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Abstract

We consider nanopatterning of dielectric substrates by harmonics of single powerful femtosecond pulses from a Ti:Sapphire laser. The nanopatterning is mediated by closely packed monolayers of polystyrene microspheres that act as microlenses at the surface. Observed modification of the material proceeds via ionization. By our theory, the second harmonic is more effective in multi-photon ionization and is better focused than the fundamental frequency which is effective in multiplying of the amount of free electrons via impact ionization. Experiments show that conversion of a part of the pulse energy into the second harmonic decreases the modification threshold and improves the localization of the structures. Optimization of the time offset between the harmonics could further improve the efficiency and quality of nanostructuring.

© 2013 OSA

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(350.3390) Other areas of optics : Laser materials processing
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Laser Microfabrication

History
Original Manuscript: July 3, 2013
Revised Manuscript: August 22, 2013
Manuscript Accepted: August 26, 2013
Published: September 5, 2013

Citation
N. Bityurin, A. Afanasiev, V. Bredikhin, A. Alexandrov, N. Agareva, A. Pikulin, I. Ilyakov, B. Shishkin, and R. Akhmedzhanov, "Colloidal particle lens arrays-assisted nano-patterning by harmonics of a femtosecond laser," Opt. Express 21, 21485-21490 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-18-21485


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