Self-action of a light beam in nematic liquid crystals in the presence of a DC electric field

Zolot’ko, A. S.; Smayev, M. P.; Barnik, M. I.

doi:10.1134/s1063776110070137

Cited by 7 publications

(14 citation statements)

References 27 publications

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“…In static electric fields, photo-induced charge carriers' accumulation and redistribution can happen at the border thin double layers (i.e., the ITO and the orientant). This mechanism can modify the electric field profile in the LC cell, for example in a planar cell, from being uniform and normal to the cell surfaces at the illumination off state to fringe distributions near to the interfaces when shone by a laser beam with an inhomogeneous profile [5]. As a result, understanding the electrical properties of the thin ITO layer seems critical.…”

Section: Opto-electronic Behavior Of the Ito Thin Filmsmentioning

confidence: 99%

“…Aberrational patterns are specified with concentric ring structure in the far diffraction zone. They have asymmetric shapes [60] with a kink at the corner seen in symmetric LC cell designs subject to a DC electric field [4,5,61].…”

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

“…Aberrational patterns with specific orientational properties can form in pure NLC cells illuminated by a visible light beam due to the SPR effect [4,5,61]. The efficiency of the SPR effect depends on the light wavelength [4,61].…”

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

“…They showed that with increasing the wavelength within a spectral range of 458-647 nm (corresponding to the photon energy range of 2.7-1.92 eV) the efficiency decreased to zero (the phenomenon was not seen at λ = 647 nm). The orientational SPR effect became manifest in the aberrational patterns formation independent of the light beam polarization [4,5,61]. It was effectively exploited at very low optical power irradiation (few milliwatt (mW)) and low biased DC voltage (a few volts) in the visible range of the light beam [4,5,61] before smoothing of the director field reorientation happened (when the maximum possible realignment was achieved) [16].…”

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

“…In pure (undoped) nematic liquid crystal (NLC) cells, the SPR effect is realized as a director field reorientation driven by a nonuniform electric field of photogenerated-charge carriers under the action of a visible light beam, which was, for example, manifested in aberrational patterns formation and characterizations [4,5]. In liquid crystal (LC) cells, it is typically specified by the tangent element of the modulated electric field at the LC interfaces with the cell surfaces [5]. Indium-tin-oxide ([In 2 O 3 :Sn], ITO) coating of the glass plates of LC sandwich cells is often used as a conducting transparent electrode for electro-optic switching.…”

Section: Introductionmentioning

confidence: 99%

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Photorefractive Effect in NLC Cells Caused by Anomalous Electrical Properties of ITO Electrodes

Habibpourmoghadam

2020

Crystals

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In a pure nematic liquid crystal (NLC) cell, optically induced charge carriers followed by transports in double border interfaces of orientant/LC and indium-tin-oxide (ITO)/orientant (or LC) can cause removal of screening of the static electric field inside the LC film. This is called surface photorefractive effect (SPR), which induces director field reorientation at a low DC electric field beyond the threshold at a reduced Fréedericksz transition and, as a result, a modulation of the LC effective refractive index. The studies conducted on the photoinduced opto-electrical responses in pure nematic LC cells biased with uniform static DC electric fields support the SPR effect (attributed to the photoelectric activation of the double interfaces). The SPR effect was further studied in LC cells with photoresponsive substrates, which act as a source of a bell-shaped electric field distribution in the LC film if no ITO electrode was employed. In an equipped cell with ITO, the photovoltaic electric field induces charge carrier redistribution in the ITO film, hence the SPR effect. This paper is aimed at highlighting all the evidences supporting ITO film as one of the fundamental sources of the SPR effect in pure NLC cells under the condition of applying low optical power and low DC voltage. An optically induced fringe electric field stemming from inhomogeneous photo-charge profiles near the electrode surfaces is expected in the LC film due to the semiconducting behavior of the ITO layer.

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Section: Opto-electronic Behavior Of the Ito Thin Filmsmentioning

confidence: 99%

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

Section: The Spr Effect Manifested In the Formation Of The Aberration Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photorefractive Effect in NLC Cells Caused by Anomalous Electrical Properties of ITO Electrodes

Habibpourmoghadam

2020

Crystals

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Optical vortex generation in homeotropic NLCs in the presence of DC electric field

Shvetsov

Zolot’ko

2016

Molecular Crystals and Liquid Crystals

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Determination of Light-Induced Deformation Characteristics of the Director Field of Nematic Liquid Crystal by Combining the Methods of Aberrational Self-Action of Light Beam and Polarization Microscopy

Kuznetsov

Shvetsov

Smayev

et al. 2023

Microscopy and Microanalysis

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Light-induced director field deformation of a nematic liquid crystal in the field of an obliquely incident laser beam is experimentally studied with aberrational self-action and polarization microscopy. Each of the methods has features associated with the geometry of the light interaction with the director. The combination of methods significantly expands the possibilities of reconstructing the light-induced nonlinear phase shift profile and the director field deformation.

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Self-action of a light beam in nematic liquid crystals in the presence of a DC electric field

Cited by 7 publications

References 27 publications

Photorefractive Effect in NLC Cells Caused by Anomalous Electrical Properties of ITO Electrodes

Photorefractive Effect in NLC Cells Caused by Anomalous Electrical Properties of ITO Electrodes

Optical vortex generation in homeotropic NLCs in the presence of DC electric field

Determination of Light-Induced Deformation Characteristics of the Director Field of Nematic Liquid Crystal by Combining the Methods of Aberrational Self-Action of Light Beam and Polarization Microscopy

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