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Proceedings Paper

Single shot and highly parallel photopolymerisation with complex light patterns generated by diffrative optical elements
Author(s): Lóránd Kelemen; László Fábián; Sándor Valkai; Pál Ormos
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Paper Abstract

Photopolymerisation by computer controlled scanning of a focused laser beam is a powerful method to build structures of arbitrary complexity with submicrometer resolution. The procedure has already proven effective to produce complex structures that can be manipulated in optical tweezers. These micromechanical systems consist of static and moving parts and are expected to be building blocks of highly capable microfluidic systems. To enhance the efficiency of structure building, we developed single shot photopolymerisation. Instead of complicated multidimensional scanning the whole structure is generated simultaneously with special diffractive patterns. We experimented with fixed diffractive optical elements, kinoforms, and Spatial Light Modulators (SLMs). By using kinoforms, cross shaped structures were produced in single shots as an illustration. These propellers were produced about an order of magnitude faster than by simple scanning, and can be rotated by optical tweezer. The complexity of the structure depends on the quality of the kinoform and the available laser power. With the concerted movement of the appropriately chosen basic pattern and the sample, the building of more complicated structures can also be greatly accelerated due to the parallel nature of the polymerisation. The possibilities of photopolymerisation using SLM were also explored: the added flexibility using the programmable device is demonstrated.

Paper Details

Date Published: 30 August 2006
PDF: 7 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63260X (30 August 2006); doi: 10.1117/12.678069
Show Author Affiliations
Lóránd Kelemen, Institute of Biophysics (Hungary)
László Fábián, Institute of Biophysics (Hungary)
Sándor Valkai, Institute of Biophysics (Hungary)
Pál Ormos, Institute of Biophysics (Hungary)

Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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