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Proceedings Paper

Optically driven micromachines for biotechnological applications
Author(s): Lorand Kelemen; Huba Kirei; Sandor Valkai; Pal Ormos
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Paper Abstract

We have shown earlier that photopolymerization offers a relatively simple method to produce microscopic particles of arbitrary shape that are practical to expand the possibilities of optical manipulation. Propeller shaped micrometer sized rotors are rotated in optical tweezers, while flat objects are oriented in traps formed by linearly polarized light. Such elements and the possibilities opened up by their use would find numerous applications in lab-on-a-chip devices. We have extended these methods by developing new elements for applications. We have built microscopic wheels ad gears that have a central flat component so that its rotational position can be controlled by linearly polarized light. These rotors are rotated by rotating the polarisation of the light. Such gears can be used as actuators of more complex micromechanical devices (pumps, valves,) also built by photopolymerization in a single process. Important component of such devices are gears rotating on fixed axes, readily built by the method. An alternative way of optically actuating rotating devices by light is the illumination of cogwheel shaped rotors from a tangential direction. The advantage of this latter approach is that the whole system (i.e. the rotors on axes and optical waveguides that carry the actuating as well as possibly the sensing light) can be built as an integrated system in a single process. Such devices would not need optical tweezers and thus bulky microscopes for actuation, significantly reducing the complexity of eventual lab-on-a-chip devices. Operational examples will be demonstrated and the properties of the different approaches will be compared.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5930, Optical Trapping and Optical Micromanipulation II, 59301F (18 August 2005); doi: 10.1117/12.616254
Show Author Affiliations
Lorand Kelemen, Institute of Biophysics, Hungarian Academy of Sciences (Hungary)
Huba Kirei, Institute of Biophysics, Hungarian Academy of Sciences (Hungary)
Sandor Valkai, Institute of Biophysics, Hungarian Academy of Sciences (Hungary)
Pal Ormos, Institute of Biophysics, Hungarian Academy of Sciences (Hungary)

Published in SPIE Proceedings Vol. 5930:
Optical Trapping and Optical Micromanipulation II
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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