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Personen: Huber, Marco R. (Autor) 
Schulz, B. M. (Autor) 
Krausch, Georg (Autor) 
Lagugne-Labarthet, F. (Autor) 
Sourisseau, C. (Autor) 
Bieringer, Thomas (Autor) 
Zilker, Stephan J. (Autor) 
  
Titel: Chromophore orientation and the formation of surface reliefs in azobenzene side-chain polymers
  
Quelle: Liquid crystals IV : 2-3 August, 2000, San Diego, USA. Bellingham, Wash. : SPIE. S. 124 - 132
Erscheinungsjahr:    2000
ISBN / ISSN: 0-8194-3752-2
URL der Originalveröffentlichung doi:10.1117/12.405314
  
Dokumentart:
Buchbeitrag Buchbeitrag
Weitere Angaben zur Dokumentart:    Konferenzbeitrag
Sprache: Englisch
Open Access:
Person der Universität:   
Einrichtung: Universitätsleitung
DDC-Sachgruppe:    Physik
ID: 53704  Universitätsbibliothek Mainz
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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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