Russian Journal of Physical Chemistry A, Feb 19, 2016
The temperature dependences of the induced dichroic ratios (DRs) of azo dyes after their photoali... more The temperature dependences of the induced dichroic ratios (DRs) of azo dyes after their photoalignment in thin films 80 to 200 nm thick are studied. It is found that the DR values of layers containing dyes of the benzeneazodiphenyl series fall from 6.0 to 1.6 as the temperature rises from 60 to 130°C, respectively. A reduction in induced DR as the temperature rises (from 20 to 100°C) is also observed for the thin films of the dyes of benzeneazo-5,5’-dioxodibenzothiophene group. The absence of induced DR after irradiation with polarized light at 100°C indicates there is no alignment of molecules at this temperature.
We present a novel method for determining the dispersion of the refractive indices of birefringen... more We present a novel method for determining the dispersion of the refractive indices of birefringent films, based on treatment of transmission spectra, in which we observe interference of light. The dispersion curves nx(λ) and ny(λ) were determined by treatment of transmission spectra obtained for normal incidence of radiation on a P2-25 birefringent fi lm, and nz(λ) was determined for oblique incidence of radiation. From the results of determination of the dispersions of the principal refractive indices of a birefringent P2-25 polypropylene film (Mogilevkhimvolokno OAO, Belarus), we established that the sample is a negative biaxial retarder with Nz = 2.9.
We developed new azo-dye photoalignment material with extremely high values of photoinduced aniso... more We developed new azo-dye photoalignment material with extremely high values of photoinduced anisotropy: order parameter S∼0.85, dichroic ratio DR∼17.5. Experiment reveals decrease of azimuthal anchoring energy for highly oriented azo-dye layers, contradicting with regular expectations. High quality patterned λ/4 retarder based on RM mesogens with ∼3 µm pattern disclination width are obtained.
Russian Journal of Physical Chemistry A, Feb 19, 2016
The temperature dependences of the induced dichroic ratios (DRs) of azo dyes after their photoali... more The temperature dependences of the induced dichroic ratios (DRs) of azo dyes after their photoalignment in thin films 80 to 200 nm thick are studied. It is found that the DR values of layers containing dyes of the benzeneazodiphenyl series fall from 6.0 to 1.6 as the temperature rises from 60 to 130°C, respectively. A reduction in induced DR as the temperature rises (from 20 to 100°C) is also observed for the thin films of the dyes of benzeneazo-5,5’-dioxodibenzothiophene group. The absence of induced DR after irradiation with polarized light at 100°C indicates there is no alignment of molecules at this temperature.
We present a novel method for determining the dispersion of the refractive indices of birefringen... more We present a novel method for determining the dispersion of the refractive indices of birefringent films, based on treatment of transmission spectra, in which we observe interference of light. The dispersion curves nx(λ) and ny(λ) were determined by treatment of transmission spectra obtained for normal incidence of radiation on a P2-25 birefringent fi lm, and nz(λ) was determined for oblique incidence of radiation. From the results of determination of the dispersions of the principal refractive indices of a birefringent P2-25 polypropylene film (Mogilevkhimvolokno OAO, Belarus), we established that the sample is a negative biaxial retarder with Nz = 2.9.
We developed new azo-dye photoalignment material with extremely high values of photoinduced aniso... more We developed new azo-dye photoalignment material with extremely high values of photoinduced anisotropy: order parameter S∼0.85, dichroic ratio DR∼17.5. Experiment reveals decrease of azimuthal anchoring energy for highly oriented azo-dye layers, contradicting with regular expectations. High quality patterned λ/4 retarder based on RM mesogens with ∼3 µm pattern disclination width are obtained.
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Papers by anatoli Murauski