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Proceedings Paper

Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals
Author(s): Bendaoud Saad; Marie-Marguerite Denariez-Roberge; Tigran V. Galstian
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Paper Abstract

Spectroscopic and holographic excitation techniques are used to study D2 azo dye doped nematic liquid crystals. Characteristic times of dye relaxation are measured. Strong dependence of the excitation upon the probe and pump light polarization is observed. The efficiency of the holographic excitation and the corresponding relaxation time depend also upon the period and orientation of the light interference pattern with respect to the initial molecular orientation. The comparison of two groups of experimental data allows the identification of the principal mechanisms of excitation of the guest-host system. The diffusion of dye molecules is, in particular, suggested to play an important role in these phenomena.

Paper Details

Date Published: 9 October 1998
PDF: 7 pages
Proc. SPIE 3418, Advances in Optical Beam Characterization and Measurements, (9 October 1998); doi: 10.1117/12.326642
Show Author Affiliations
Bendaoud Saad, COPL/Univ. Laval (Canada)
Marie-Marguerite Denariez-Roberge, COPL/Univ. Laval (Canada)
Tigran V. Galstian, COPL/Univ. Laval (Canada)

Published in SPIE Proceedings Vol. 3418:
Advances in Optical Beam Characterization and Measurements
Michel Piche, Editor(s)

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