Mechanism of LCD photoalignment

Hoi-Sing Kwok; M. Khazimullin; Vladimir G. Chigrinov

doi:10.1117/12.453296

12 December 2002 Mechanism of LCD photoalignment

Hoi-Sing Kwok, M. Khazimullin, Vladimir G. Chigrinov

Proceedings Volume 4799, Liquid Crystals VI; (2002) https://doi.org/10.1117/12.453296
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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 t_exp 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(t_exp) for different power values W, we can estimate the coefficient of rotational diffusion D and azodye order parameter S(t_exp).

Citation Download Citation

Hoi-Sing Kwok, M. Khazimullin, and Vladimir G. Chigrinov "Mechanism of LCD photoalignment", Proc. SPIE 4799, Liquid Crystals VI, (12 December 2002); https://doi.org/10.1117/12.453296

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