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

    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

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