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Control of self-writing processes in photopolymerizable resins for the fabrication of micro-optical structures

: Streppel, U.; Dannberg, P.; Wächter, C.; Bräuer, A.


Consortini, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; International Commission for Optics -ICO-:
ICO-19, 19th Congress of the International Commission for Optics. Technical digest. Part I : Optics for the Quality of Life, Firenze, Italy, 25-30 August 2002
Bellingham/Wash.: SPIE, 2003 (SPIE Proceedings Series 4829)
ISBN: 0-8194-4569-7
International Commission for Optics (Congress) (ICO) <19, 2002, Firenze>
Conference Paper
Fraunhofer IOF ()
self-writing; photopolymerization; self-organization; self-focusing; 3D microfabrication

We present the investigation of 3D micro-optical structure formation in photopolymerizable polymers due to controlled self-writing processes. A locally deposited amount of energy during the material exposure leads to a local non-linear change of the refractive index. This results in self-focusing and self-guiding effects. The influence from a set of process parameters (chemical parameters, exposure conditions) on the structure formation is investigated theoretically by an iterative beam propagation method (BPM) to investigate the opportunities for a well directed usage of the selforganizing material character. The basis for this is a theoretical and experimental study of the material response towards the absorbed energy, which is presented in this paper. The experimental realization is exemplarily shown by the fabrication of high aspect ratio conic structures in ORMOCEIC polymers.