Electrically assisted light-induced azimuthal gliding of the nematic liquid-crystal easy axis on photoaligned substrates

Dubtsov, Alexander V.; Pasechnik, S. V.; Kiselev, Alexei D.; Shmeliova, Dina V.; Chigrinov, Vladimir G.

doi:10.1103/physreve.82.011702

Cited by 14 publications

(43 citation statements)

References 28 publications

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“…9(a)-(c)). Similar to previously reported results, [4][5][6] separate action of light irradiation at appropriate parameters did not induce changes in easy axis position. Figure 9(b) and (c) presents microscopic images of a spot in crossed (b) and parallel (c) polarizers after the LPUV irradiation assisted by permanent magnetic field.…”

Section: Regime B: Light-induced Reorientation Of Nlc Assisted By "Insupporting

confidence: 92%

“…It means that the characteristic times of a gliding depend on the values of a preliminary irradiation dose (anchoring energy), which are in a qualitative agreement with the previous results. 4 The images of the cell before (a) and after (b) combined action of light and electric field are shown in Fig. 5.…”

Section: Preparation Of the Cells And Experimental Setup For "In-planmentioning

confidence: 99%

“…surface (4), to the variation of an azimuth angle φ e of a simultaneous rotation (gliding) of easy axes on both substrates:…”

Section: Preparation Of the Cells And Experimental Setup For "In-planmentioning

confidence: 99%

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Electric and magnetic fields in photoalignment of liquid crystals

et al. 2015

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-The results of investigation of slow surface dynamics (easy axis gliding), induced by secondary illumination of photoaligned substrates with linearly polarized UV or blue light in the presence of electric (magnetic) fields, are presented for the first time. The initial surface orientation of nematic liquid crystal (NLC) was provided, in accordance with the standard photoalignment technique, via preliminary UV treatment of the glass substrates coated by sulfonic azo-dye SD1 film. The experiments fulfilled for the two geometries, A and B, corresponding to the normal (A) and parallel (B) orientation of fields relatively to liquid crystal (LC) layer, revealed different effects induced by electric (magnetic) fields. For geometry A, strong electric field applied, in combination with a linearly polarized blue light, to the planar layer in a sandwich-like LC cell with two photoaligned substrates results in simultaneous reorientation of easy axis on both substrates. It demonstrates the possibility of an azimuthal rotation of monodomain planar samples of LCs. For geometry B, usage of "in-plane" electric (magnetic) fields in the cell, composed of photoaligned and rubbed substrates, speeds up reorientation process of NLC easy axis respectively to pure light-induced reorientation. It provides electric control of operating times in previously proposed optical rewritable technology.

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Section: Regime B: Light-induced Reorientation Of Nlc Assisted By "Insupporting

confidence: 92%

Section: Preparation Of the Cells And Experimental Setup For "In-planmentioning

confidence: 99%

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Electric and magnetic fields in photoalignment of liquid crystals

et al. 2015

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“…Photoalignment techniques [20] enable performance of the alignment non-uniformities with a resolution of order of the light wavelength. This fact, as well as the reports about possibilities to alter alignment conditions with polarized light in already fabricated LC devices [21,22], makes the approach based on inhomogeneous alignment especially attractive for DOE.…”

Section: Introductionmentioning

confidence: 99%

On liquid crystal diffractive optical elements utilizing inhomogeneous alignment

Valyukh¹,

Chigrinov²,

Kwok³

et al. 2012

Opt. Express

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Formation of a desired liquid crystal (LC) director distribution by the use of inhomogeneous anchoring and pre-tilt angle for electrically controlled diffractive optical elements (DOE) is studied. Such LC DOE can have high periodicity and diffraction efficiency. At the same time they are free of constructive regularities, e.g. a periodic arrangement of the electrodes or thickness deviations, which have undesired impact on diffractive characteristics of LC DOE of other types. We focus on evaluation of potential functional abilities of LC DOE with inhomogeneous alignment. The reasons causing restriction of the LC DOE diffraction efficiency and periodicity are considered. Approaches for improvement of characteristics of the LC DOE are discussed. ©2012 Optical Society of America

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“…A potential application in LC photonics devices with a high LC alignment stability is envisaged. We studied azimuthal gliding of the easy axis that occurs in nematic LC brought in contact with the photoaligned substrate initially irradiated azo-dye film under the action of reorienting UV light combined with in-plane electric field [5]. For irradiation with the linearly polarized light, the dynamics of easy axis reorientation is found to be faster as compared to the case of nonpolarized light.…”

mentioning

confidence: 99%