Loading…
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...
Saved in:
Published in: | Journal of modern optics 1998-06, Vol.45 (6), p.1163-1173 |
---|---|
Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
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 |