We report on the possibility of strong relief grating fabrication in amorphous chalcogenide As2S3 glass using polarization modulated near bandgap light illumination. Such gratings are created using low intensity and spatially uniform light illumination. The obtained relief structures are strong, very smooth and do not require post-exposure development procedures. They are stable to the heat treatment and the uniform photo-exposure. The possible mechanism of such relief structure formation is also briefly discussed.
We have performed an experiment in a chalcogenide thin film that is questionning some aspects of the currently accepted phenomenological model for the photoinduced anisotropy in such material. By analyzing the kinetics of the photoinduced linear dichroism, we were able to explain our experimental results by revisiting the current model which is based on anisotropic microstructures. This model is modified to include disk-shaped polarizability tensor. The approach we present is a useful tool to extract information on the optical properties of microscopic structures based on a macroscopic phenomenon.
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