Study of the photocurrent in liquid crystal cells exhibiting the photorefractive effect

Zolot’ko, A. S.; Лобанов, А. Н.; Smayev, M. P.; Tskhovrebov, A. M.; Averyushkin, A. S.; Barnik, M. I.

doi:10.3103/s1068335610020041

Cited by 2 publications

(13 citation statements)

References 10 publications

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“…It resembles the asymmetry found for NLCs subjected to the combined action of light and DC electric fields [19,20]. In our case, the external DC field affects the pattern shape as well.…”

Section: Light Interaction With Planarly Aligned Nlcssupporting

confidence: 53%

“…In the latter case, light affects the concentration of the charges situated near the NLC surface. The efficiency of the surface photorefractivity is independent of the light polarization [19,20].…”

Section: Discussionmentioning

confidence: 99%

“…The photorefractive effect can be of the bulk [21,22] or surface [23,24,19,20] origin. In the former case, the efficiency of the charge generation in the NLC bulk should depend on absorption and, hence, on the light beam polarization.…”

Section: Discussionmentioning

confidence: 99%

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Asymmetric Aberration Pattern at Light-Beam Self-Action in NLC Doped with Stilbene Dye

Zolot’ko

Smayev

Barnik

2008

Molecular Crystals and Liquid Crystals

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Light-beam interaction with nematic liquid crystals doped with stilbene dye DEANS (4-diethylamino-4 0 -nitrostilbene) has been studied experimentally. For the homeotropic sample, a conventional ring-shaped aberration self-focusing pattern (related to the dye-induced orientational nonlinearity) and the memory effect were observed. For the planar sample, a complex asymmetric aberration pattern qualitatively different from the concentric-ring system was observed for the first time. The study of the phenomenon allowed us to assume that this pattern is due to the bulk photorefractive effect.

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“…It resembles the asymmetry found for NLCs subjected to the combined action of light and DC electric fields [19,20]. In our case, the external DC field affects the pattern shape as well.…”

Section: Light Interaction With Planarly Aligned Nlcssupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric Aberration Pattern at Light-Beam Self-Action in NLC Doped with Stilbene Dye

Zolot’ko

Smayev

Barnik

2008

Molecular Crystals and Liquid Crystals

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“…Further investigations confirmed the dominancy of the surface charge modulation in the photorefractive effect observed in pure NLCs, while rejecting the hypothesis of anchoring tuning at the LC cell surfaces [11]. It was understood from a diminished threshold voltage verified selectively at the anode in the laser on state, and hence decreasing the effective operating DC voltage [11][12][13]. This effect was realized at the double layers of polymer-LC and transparent electrode (ITO)-polymer in pure LC cells [11,13] illuminated with an appropriate wavelength.…”

Section: Introductionmentioning

confidence: 89%

“…It was understood from a diminished threshold voltage verified selectively at the anode in the laser on state, and hence decreasing the effective operating DC voltage [11][12][13]. This effect was realized at the double layers of polymer-LC and transparent electrode (ITO)-polymer in pure LC cells [11,13] illuminated with an appropriate wavelength. The alternating mode, AC, does not support charge carriers accumulation in the ITO electrode, hence the SPR effect [14].…”

Section: Introductionmentioning

confidence: 99%

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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Study of the photocurrent in liquid crystal cells exhibiting the photorefractive effect

Cited by 2 publications

References 10 publications

Asymmetric Aberration Pattern at Light-Beam Self-Action in NLC Doped with Stilbene Dye

Asymmetric Aberration Pattern at Light-Beam Self-Action in NLC Doped with Stilbene Dye

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

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