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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 17028–17041

Three-dimensional laser micro-sculpturing of silicone: towards bio-compatible scaffolds

Sima Rekštytė, Mangirdas Malinauskas, and Saulius Juodkazis  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 17028-17041 (2013)
http://dx.doi.org/10.1364/OE.21.017028


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Abstract

Possibility to form three-dimensional (3D) micro-structures in silicone elastomer (polydimethylsiloxane; PDMS) doped with different photo-initiators was systematically investigated using direct laser writing with femtosecond laser pulses at different exposure conditions. Accuracy of the 3D structuring with resolution of ∼ 5 μm and a fabrication throughput of ∼720 μm3/s, which is exceeding the previously reported values by ∼ 300×, was achieved. Practical recording velocities of ∼ 1 mm/s were used in PDMS with isopropyl-9H-thioxanthen-9-one (ISO) and thioxanthen-9-one (THIO) photo-initiators which both have absorption at around 360 nm wavelength. The 3D laser fabrication in PDMS without any photo-initiator resulting in a fully bio-compatible material has been achieved for the first time. Rates of multi-photon absorption and avalanche for the structuring of silicone are revealed: the two-photon absorption is seeding the avalanche of a radical generation for subsequent cross-linking. Direct writing enables a maskless manufacturing of molds for soft-lithography and 3D components for microfluidics as well as scaffolds for grafts in biomedical applications.

© 2013 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(220.4000) Optical design and fabrication : Microstructure fabrication
(350.3850) Other areas of optics : Materials processing
(160.1245) Materials : Artificially engineered materials

ToC Category:
Laser Microfabrication

History
Original Manuscript: March 18, 2013
Revised Manuscript: May 24, 2013
Manuscript Accepted: May 30, 2013
Published: July 10, 2013

Virtual Issues
Vol. 8, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Sima Rekštytė, Mangirdas Malinauskas, and Saulius Juodkazis, "Three-dimensional laser micro-sculpturing of silicone: towards bio-compatible scaffolds," Opt. Express 21, 17028-17041 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-17028


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