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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011

Three-dimensional micro-/nano-structuring via direct write polymerization with picosecond laser pulses

Mangirdas Malinauskas, Paulius Danilevičius, and Saulius Juodkazis  »View Author Affiliations


Optics Express, Vol. 19, Issue 6, pp. 5602-5610 (2011)
http://dx.doi.org/10.1364/OE.19.005602


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Abstract

We demonstrate capability to structure photo-polymers with sub-wavelength resolution, ∼ 200−500 nm, and retrieve three-dimensional (3D) structures using a picosecond laser exposure. This alternative to commonly used ultra-short femtosecond lasers extends accessability of 3D direct write. A popular hybrid sol-gel resist SZ2080 was used for quantitative determination of structuring resolution at 1064 nm and 532 nm wavelengths and for pulses of 8-25 ps duration at the repetition rates of 0.2 - 1 MHz. Systematic study of feature size dependence of 3D suspended nano-rods shows that linear power dependence of photopolymerization on the dose-per-pulse becomes dominant at higher repetition rates (≥0.5MHz) while the two-photon nonlinear absorption is still distinguishable at rates lower than 0.2 MHz and shorter pulses (≤ 8 ps). Thermal accumulation defines polymerization when cooling time of the focal volume is larger than separation between pulses. Photopolymerization and its scaling mechanisms, quality, and fidelity at tight focusing of fs-, ps-, and cw-laser radiation are revealed and explained. 3D scaffolds for biomedicine and microlenses for optical applications are fabricated by the ps-laser direct write.

© 2011 Optical Society of America

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
(160.4236) Materials : Nanomaterials

ToC Category:
Laser Microfabrication

History
Original Manuscript: January 24, 2011
Manuscript Accepted: February 21, 2011
Published: March 10, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Mangirdas Malinauskas, Paulius Danilevičius, and Saulius Juodkazis, "Three-dimensional micro-/nano-structuring via direct write polymerization with picosecond laser pulses," Opt. Express 19, 5602-5610 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-6-5602


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