New perspectives for direct PDMS microfabrication using a CD-DVD laser

• Published in: Lab on a chip Vol. 13; no. 24; pp. 4848 - 4854
• Main Authors: Hautefeuille, M, Cabriales, L, Pimentel-Domínguez, R, Velázquez, V, Hernández-Cordero, J, Oropeza-Ramos, L, Rivera, M, Carreón-Castro, M P, Grether, M, López-Moreno, E
• Format: Journal Article
• Language: English
• Published: England 21.12.2013
• Subjects: Beams (radiation); Cadmium; Carbon; Chemical Phenomena; Combustion; Compact Disks; Dimethylpolysiloxanes - chemistry; Focusing; Hydrophobic and Hydrophilic Interactions; Incandescence; Lasers; Microtechnology - instrumentation; Silicone resins
• ISSN: 1473-0197; 1473-0189
• DOI: 10.1039/c3lc51041g

A simple and inexpensive alternative to high-power lasers for the direct fabrication of microchannels and rapid prototyping of poly-dimethylsiloxane (PDMS) is presented. By focusing the infrared laser beam of a commercial, low-power CD-DVD unit on absorbing carbon micro-cluster additives, highly localized PDMS combustion can be used to etch the polymer, which is otherwise transparent at such wavelengths. Thanks to a precise and automated control of laser conditions, laser-induced incandescence is originated at the material surface and produces high-resolution micropatterns that present properties normally induced with lasers of much greater energies in PDMS: formation of in situ nanodomains, local fluorescence and waveguide patterns. An extensive study of the phenomenon and its performance for PDMS microfabrication are presented.