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Proceedings Paper

Self-organized filamentation of photoresponsive polymers during UV curing
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Paper Abstract

The exposure of thick UV sensitive polymer layers leads to the formation of self-organized refractive index filaments, which appear after a certain layer thickness, typically in the range of 50 μm. This effect has strong influence on the fabrication of, e.g., high precision micro-optical elements. In particular, diffraction limited micro-lenses with high sag or high aspect ratio on-chip collimators require a perfect index homogeneity. We show that the saturable and irreversible change of the polymer refractive index causes a modulational instability (MI), which finally leads to the creation of filaments. It will be presented that a maximum growth rate for a certain spatial frequency of an initial perturbation exists. This MI gain determines the dynamics of the filament formation. The impact of the exposure conditions, e.g., chemical process parameters, on the homogeneity of the UV cured polymer is discussed for ORMOCERTM type polymers.

Paper Details

Date Published: 14 July 2003
PDF: 11 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.475432
Show Author Affiliations
Ulrich Streppel, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Dirk Michaelis, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Andreas H. Braeuer, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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