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Combined Main- and Side-Chain Azobenzene Polyesters: A Potential For Photoinduced Nonlinear Waveguides

Published online by Cambridge University Press:  10 February 2011

F. Sahlén ,
T. Geisler ,
S. Hvilsted ,
N. C. R. Holme ,
P. S. Ramanujam  and
J. C. Petersen
F. Sahlén
Affiliation:
Condensed Matter Physics and Chemistry Department, Risoe National Laboratory, DK-4000 Roskilde, Denmark
T. Geisler
Affiliation:
Condensed Matter Physics and Chemistry Department, Risoe National Laboratory, DK-4000 Roskilde, Denmark
S. Hvilsted
Affiliation:
Condensed Matter Physics and Chemistry Department, Risoe National Laboratory, DK-4000 Roskilde, Denmark
N. C. R. Holme
Affiliation:
Optics and Fluid Dynamics Department, Risoe National Laboratory, DK-4000 Roskilde, Denmark
P. S. Ramanujam
Affiliation:
Optics and Fluid Dynamics Department, Risoe National Laboratory, DK-4000 Roskilde, Denmark
J. C. Petersen
Affiliation:
Danish Institute of Fundamental Metrology, DK-2800 Lyngby, Denmark
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Abstract

New combined main- and side-chain azobenzene polyesters, which exhibit an intensity dependent refractive index, have been prepared in order to optically fabricate nonlinear waveguides. Novel sulfone azobenzenes, a diester, (4-[[5-(ethoxycarbonyl)pentyl]sulfonyl]-4'-[[5-(ethoxycarbonyl)pentyl]methylamino] azobenzene, and a diol, 4-[[(8-hydroxy-7-methylhydroxy)-octyl]sulfonyl]-4'-N, N-dimethylamino azobenzene, have been used to prepare new polyesters by transesterification in the molten state. The polyesters have been characterized by UV-visible spectroscopy, differential scanning calorimetry (DSC), size exclusion chromatography (SEC), third harmonic generation (THG) and optical anisotropy measurements. The molar masses of the polyesters were in the range of 5000-10000 g mol−1, which was sufficient in order to spin coat thin films. From THG measurements the polymers are shown to possess an offresonance electronic X(3) of the order 10−12 esu corresponding to a nonlinear refractive index of 2.3×10−14 cm2/W.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 561: Symposium F – Organic Nonlinear Optical Materials and Devices , 1999 , 57
Copyright
Copyright © Materials Research Society 1999

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References

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