Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 25: POSTER Electronic Structure and Spectroscopy

CPP 25.19: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Holographic recording of more-dimensional periodic refractive index patterns — •Rafael Meinhardt — University Duisburg-Essen, Applied Physics, 47057 Duisburg, Germany

Based on multiple-beam interference, 1-D, 2-D or 3-D optical lattices were created to generate refractive index patterns with crystalline and quasi-crystalline structure inside two different photosensitve material systems by applying the method of holographic lithography.

For the relationships between the recording parameters and the desired optical lattice numerical simulations calculate the spatial intensity profile formed by N coherent plane waves. The resulting optical lattice can be visualized in the form of an animation or several plots and its lattice constants can be discribed by using standard crystallographic formalisms.

Considering the simulation parameters, different holographic setups in vertical and horizontal geometry are realized, with which we are able to perform either consecutive or simultanous structuring of the material. These optical lattices were transfered both in solid plates of photosensitive PMMA and in evaporated films of the azo dye Disperse Red 1.

The recorded structures were characterized by evaluating the resulting diffraction patterns and AFM images. In PMMA a pure refractive index pattern was observed whereas in DR1 a dual grating was formed which is made up of a refractive and a surface relief. In both cases the simulated structures have been confirmed.