Optical and thermal properties in ultrafast laser surface nanostructuring on biodegradable polymer

Shuhei Yada, Mitsuhiro Terakawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate the effect of optical and thermal properties in laser-induced periodic surface structures (LIPSS) formation on a poly-L-lactic acid (PLLA), a biodegradable polymer. Surface properties of biomaterials are known to be one of the key factors in tissue engineering. Methods to process biomaterial surfaces have been studied widely to enhance cell adhesive and anisotropic properties. LIPSS formation has advantages in a dry processing which is able to process complex-shaped surfaces without using a toxic chemical component. LIPSS, however, was difficult to be formed on PLLA due to its thermal and optical properties compared to other polymers. To obtain new perspectives in effect of these properties above, LIPSS formation dependences on wavelength, pulse duration and repetition rate have been studied. At 800 nm of incident wavelength, high-spatial frequency LIPSS (HSFL) was formed after applying 10000 femtosecond pulses at 1.0 J/cm2 in laser fluence. At 400 nm of the wavelength, HSFL was formed at fluences higher than 0.20 J/cm2 with more than 3000 pulses. Since LIPSS was less formed with lower repetition rate, certain heat accumulation may be required for LIPSS formation. With the pulse duration of 2.0 ps, higher laser fluence as well as number of pulses compared to the case of 120 fs was necessary. This indicates that multiphoton absorption process is essential for LIPSS formation. Study on biodegradation modification was also performed.

Original languageEnglish
Title of host publicationFrontiers in Ultrafast Optics
Subtitle of host publicationBiomedical, Scientific, and Industrial Applications XV
EditorsMichel Meunier, Peter R. Herman, Stefan Nolte, Alexander Heisterkamp
PublisherSPIE
ISBN (Electronic)9781628414455
DOIs
Publication statusPublished - 2015 Jan 1
EventFrontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV - San Francisco, United States
Duration: 2015 Feb 82015 Feb 10

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9355
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherFrontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV
CountryUnited States
CitySan Francisco
Period15/2/815/2/10

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Keywords

  • Biodegradable
  • Femtosecond Laser
  • LIPSS
  • PLLA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Yada, S., & Terakawa, M. (2015). Optical and thermal properties in ultrafast laser surface nanostructuring on biodegradable polymer. In M. Meunier, P. R. Herman, S. Nolte, & A. Heisterkamp (Eds.), Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV [935503] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9355). SPIE. https://doi.org/10.1117/12.2080483