Femtosecond laser ablation of polymeric substrates for the fabrication of microfluidic channels

► Near-IR fs laser ablation on common thermoplastic polymers was investigated. ► The dimensions of femtosecond ablated microchannels are easily tunable. ► Surface quality of ablated microchannels is similar to that obtained by micromilling. ► Poly(methyl methacrylate)’s structure is the most stable...

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Bibliographic Details
Published in:Applied surface science 2011-05, Vol.257 (14), p.6243-6250
Main Authors: Suriano, Raffaella, Kuznetsov, Arseniy, Eaton, Shane M., Kiyan, Roman, Cerullo, Giulio, Osellame, Roberto, Chichkov, Boris N., Levi, Marinella, Turri, Stefano
Format: Article
Language:English
Subjects:
Ablation
Channels
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Femtosecond
Femtosecond laser
Laser ablation
Microchannels
Microfluidics
Physics
Polymer
Polymethyl methacrylates
Polystyrene resins
Thermoplastic resins
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Summary:► Near-IR fs laser ablation on common thermoplastic polymers was investigated. ► The dimensions of femtosecond ablated microchannels are easily tunable. ► Surface quality of ablated microchannels is similar to that obtained by micromilling. ► Poly(methyl methacrylate)’s structure is the most stable during laser irradiation. ► Polystyrene and cyclic olefin polymer show darkening and oxidation. This manuscript presents a study of physical and chemical properties of microchannels fabricated by femtosecond laser processing technology in thermoplastic polymeric materials, including poly(methyl methacrylate) (PMMA), polystyrene (PS) and cyclic olefin polymer (COP). By surface electron microscopy and optical profilometry, the dimensions of microchannels in the polymers were found to be easily tunable, with surface roughness values comparable to those obtained by standard prototyping techniques such as micromilling. Through colorimetric analysis and optical microscopy, PMMA was found to remain nearly transparent after ablation while COP and PS darkened significantly. Using infrared spectroscopy, the darkening in PS and COP was attributed to significant oxidation and dehydrogenation during laser ablation, unlike PMMA, which was found to degrade by a thermal depolymerization process. The more stable molecular structure of PMMA makes it the most viable thermoplastic polymer for femtosecond laser fabrication of microfluidic channels.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.02.053