Chromophore orientation and the formation of surface reliefs in azobenzene side-chain polymers

Marco R. Huber; B. M. Schulz; G. Krausch; F. Lagugne-Labarthet; C. Sourisseau; Thomas Bieringer; Stephan J. Zilker

doi:10.1117/12.405314

24 October 2000 Chromophore orientation and the formation of surface reliefs in azobenzene side-chain polymers

Marco R. Huber, B. M. Schulz, G. Krausch, F. Lagugne-Labarthet, C. Sourisseau, Thomas Bieringer, Stephan J. Zilker

Proceedings Volume 4107, Liquid Crystals IV; (2000) https://doi.org/10.1117/12.405314
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The occurrence of surface relief gratings in azobenzene polymers under illumination with two superimposed laser beams is a puzzling effect which was discovered only few years ago. The origin of the large mass transport which occurs far below the glass transition temperature is not yet understood. We have performed experiments with cw holography. Due to low laser fluence, thermal effects can mostly be neglected. We have studied the relation between the light induced orientation of the chromophores in the bulk of the material and the observed surface relief gratings. We have performed a number of studies: Surface relief gratings were characterized under different polarization geometries of the writing beams, furthermore the grating period was varied. We could show that there is a competing behavior between the diffraction efficiencies by the volume grating and the surface relief, respectively. In order to analyze the orientational distribution function of the azobenzene chromophores, we have performed confocal Raman microspectroscopy in different regions of the surface relief grating. Our results are not in agreement with the current theories for the formation of surface reliefs.

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Marco R. Huber, B. M. Schulz, G. Krausch, F. Lagugne-Labarthet, C. Sourisseau, Thomas Bieringer, and Stephan J. Zilker "Chromophore orientation and the formation of surface reliefs in azobenzene side-chain polymers", Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); https://doi.org/10.1117/12.405314

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