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Dynamics of orientationally enhanced polymeric photorefractive composites

Empirical fits to the rise and decay of real time written holograms in a photorefractive-crystallization-resistant polymer composite (1-(2′-ethyl-hexyloxyl)-2,5-dimethyl-4-(4″-nitrophenylazo)benzene:poly(N-vinylcarbazole):2,4,7-fluorenone) are presented. The speed of response of the composite materi...

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Bibliographic Details
Published in:Journal of modern optics 1998-06, Vol.45 (6), p.1163-1173
Main Authors: West, K. S., Shakos, J. D., West, D. P., King, T. A., Blackburn, R. D.
Format: Article
Language:English
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Summary:Empirical fits to the rise and decay of real time written holograms in a photorefractive-crystallization-resistant polymer composite (1-(2′-ethyl-hexyloxyl)-2,5-dimethyl-4-(4″-nitrophenylazo)benzene:poly(N-vinylcarbazole):2,4,7-fluorenone) are presented. The speed of response of the composite material in time-resolved four-wave-mixing experiments decreases with increasing percentage azo dye in the composite, increases with increasing poling voltage and increasing temperatures. Mach-Zehnder data show that there is a gradual decrease in the extent to which the dye molecules can reorient under a modulated applied field as the modulation frequency is increased. Greater reorientational freedom and hence faster reorientation for a greater percentage of dye is observed at lower frequencies of modulation of the applied field. Lower bounds to the mobility and photosensitivity of the composites are calculated.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500349808230907