Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals

Bendaoud Saad; Marie-Marguerite Denariez-Roberge; Tigran V. Galstian

doi:10.1117/12.326642

9 October 1998 Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals

Bendaoud Saad, Marie-Marguerite Denariez-Roberge, Tigran V. Galstian

Proceedings Volume 3418, Advances in Optical Beam Characterization and Measurements; (1998) https://doi.org/10.1117/12.326642
Event: Lasers and Materials in Industry and Opto-Contact Workshop, 1998, Quebec, Canada

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.

Citation Download Citation

Bendaoud Saad, Marie-Marguerite Denariez-Roberge, and Tigran V. Galstian "Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals", Proc. SPIE 3418, Advances in Optical Beam Characterization and Measurements, (9 October 1998); https://doi.org/10.1117/12.326642

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