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Proceedings Paper

Writing diffractive structures by optical trapping
Author(s): Jean-Marc R. Fournier; Michael M. Burns; Jene A. Golovchenko
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Paper Abstract

Optical forces, such as radiation pressure and the gradient force, are used to trap microscopic size dielectric particles. Regular arrays of optical traps can be constructed interferometrically, and more complex assemblages of traps could be made through holographic-type set-ups. Such optical-well arrays are useful in writing and erasing dynamic gratings. Two-dimensional `optical crystals', composed of monodispersed polystyrene spheres in water, display high diffraction efficiencies and low noise level, thanks respectively to a very high index modulation, and to the very small size dispersion of the scatterers. Many dielectric micro- objects can be arranged in such trap assemblies to form diffractive structures. This is the case in particular for biological materials such as bacteria or other organisms currently trapped with laser tweezers. The possibilities of manufacturing 3D diffractive structures are explored.

Paper Details

Date Published: 12 April 1995
PDF: 11 pages
Proc. SPIE 2406, Practical Holography IX, (12 April 1995); doi: 10.1117/12.206208
Show Author Affiliations
Jean-Marc R. Fournier, Rowland Institute for Science (United States)
Michael M. Burns, Rowland Institute for Science (United States)
Jene A. Golovchenko, Rowland Institute for Science and Harvard Univ. (United States)

Published in SPIE Proceedings Vol. 2406:
Practical Holography IX
Stephen A. Benton, Editor(s)

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