Shedding light on alignment

Jones, John C.; Day, SE

doi:10.1038/351015a0

Cited by 81 publications

(44 citation statements)

References 5 publications

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“…171 Although experimental details were not available, it has been assumed that the photoalignment takes place as a result of the repetition of polarized E-Z photoisomerization of the azo dye. 174 In the case of PVA doped with water-soluble azo dyes, the polarization photochromism gives rise to photodichroism, as previously reported by Todorov et al 72 A homogeneous alignment of liquid crystals was induced in the cell assembled using the dye-doped PVA thin film. The photoinduced liquid-crystal orientation was retained without any deterioration although the photoinduced dichroism of the azobenzene chromophere disappeared rapidly.…”

Section: In-plane Alignment Photocontrolmentioning

confidence: 76%

Photochromic Polymers

Ichimura¹

Organic Photochromic and Thermochromic Compounds

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Section: In-plane Alignment Photocontrolmentioning

confidence: 76%

Photochromic Polymers

Ichimura¹

Organic Photochromic and Thermochromic Compounds

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“…Spontaneous pattern formation arises from the interplay between selfaction (e.g. photoisomerization [4]) and long-range interaction (e.g. diffraction [5]).…”

Section: Incoherent Light Induced Self-organization Of Moleculesmentioning

confidence: 99%

Incoherent light-induced self-organization of molecules

et al. 2005

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ABSTRACT:Although coherent light is usually required for the self-organization of regular spatial patterns from optical beams, we show that peculiar light matter interaction can break this evidence. In the traditional method to record laser-induced periodic surface structures, a light intensity distribution is produced at the surface of a polymer film by an interference between two coherent optical beams. We report on the self-organization followed by propagation of a surface relief pattern. It is induced in a polymer film by using a low-power and small-size coherent beam assisted by a high-power and large-size incoherent and unpolarized beam. We demonstrate that we can obtain large size and well organized patterns starting from a dissipative interaction. Our experiments open new directions to improve optical processing systems.

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“…16,17 In order to study the photoreorientation of azobenzene units in the photoalignment layers, we measured the birefringence of the photo-PA film. In this experiment, a photoelastic modulator ͑PEM͒ configuration with a 632.8 nm probing light from a He-Ne laser at an incidence angle of 60°w as used.…”

Section: A Photoinduced Orientation Of the Alignment Layermentioning

confidence: 99%

Director tilting of liquid crystals on photoisomerizable polyimide alignment layers doped with homeotropic surfactant

Park

Han

Jung

et al. 1999

Journal of Applied Physics

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Director tilting of liquid crystal (LC) molecules on photosensitive alignment layers has been investigated. The layers, polyimides with photoisomerizable groups in their main chains, were irradiated with unpolarized near-UV (UPUV) light at oblique incidence. The irradiated film was found to align LC molecules homogeneously with a negligible pretilt angle. It was found that the pretilt angle can be generated successfully by introducing surfactant lecithin and decreasing the incidence angle of the UPUV light. The LC alignment and electro-optical properties of the LC cells with the photoalignment layers were demonstrated to be suitable for twisted nematic LC, vertical alignment LC, and surface-stabilized ferroelectric LC devices.

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Shedding light on alignment

Cited by 81 publications

References 5 publications

Photochromic Polymers

Photochromic Polymers

Incoherent light-induced self-organization of molecules

Director tilting of liquid crystals on photoisomerizable polyimide alignment layers doped with homeotropic surfactant

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