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Proceedings Paper

Mechanism of LCD photoalignment
Author(s): Hoi-Sing Kwok; M. Khazimullin; Vladimir G. Chigrinov
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Paper Abstract

The mechanism of photo-aligning (PA) of azodye molecules is investigated. We show that PA takes place due to the pure reorientation of the molecular absorption oscillators perpendicular to the UV-light polarization. The model of the rotational diffusion of the azodye molecules in the field of polarized UV-light was used to explain the formation of the photo-induced order in azodye layers. We constructed a special experimental set-up, based on a photo-elastic modulator, that allows to make accurate measurements of the phase retardation δ of thin film as a function of the exposure time texp and exposure power W (W/cm2). The optical anisotropy was induced by a pump beam of Ar+ laser (λ=457 nm). Fitting the experimental curves d(texp) for different power values W, we can estimate the coefficient of rotational diffusion D and azodye order parameter S(texp).

Paper Details

Date Published: 12 December 2002
PDF: 10 pages
Proc. SPIE 4799, Liquid Crystals VI, (12 December 2002); doi: 10.1117/12.453296
Show Author Affiliations
Hoi-Sing Kwok, Hong Kong Univ. of Science and Technology (China)
M. Khazimullin, Hong Kong Univ. of Science and Technology (China)
Vladimir G. Chigrinov, Hong Kong Univ. of Science and Technology (Hong Kong)

Published in SPIE Proceedings Vol. 4799:
Liquid Crystals VI
Iam-Choon Khoo, Editor(s)

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