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Samples of PMMA (Poly-(Methyl-Meth-Acrylate)) have been modified by ionizing radiation (especially UV-radiation) in order to generate regions of increased refractive index for the use as optical waveguides in a surface layer. To get a befler understanding of the formation of these guides the chemical processes which are responsible for the increase of the refractive index were studied using different spectroscopic methods. It is shown that the tickness as well as the refractive index profile of the layer at the surface depends on the irradiation dose. In this paper also the guiding properties of the waveguides in dependence of these parameters are discussed. The waveguiding structures were used to build optical polarizers simply by varying the exposure time. The spectral absorption behavior of different strip waveguides for different exposure doses were studied.

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