Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

Ayriyan, Alexander; Ayryan, Е. A.; Egorov, A. A.; Dencheva-Zarkova, Maria; Hadjichristov, Georgi B.; Marinov, Yordan G.; Maslyanitsyn, I. A.; Петров, А. Г.; Popova, L.; Shigorin, V. D.; Strigazzi, Alfredo; Torgova, S. I.

doi:10.1051/epjconf/201817303002

Cited by 4 publications

(13 citation statements)

References 4 publications

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“…3) formed from NLC 4-Cyano-4'-pentylbiphenyl (4-Cyano-4'-pentylbiphenyl or 5CB), well known from publications in the scientific and scientific literature (see e.g. [1][2][3][4][5], as well as planar waveguide NLC 3D lenses ( fig. 3).…”

Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

“…3). In this geometry, the equation of director motion (see [1][2][3][4]6] for details), which expresses the balance between the elastic and viscous torque and the external field torque, has close-to-zero initial and boundary conditions.…”

Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

“…In the present work, integrated-optical waveguides and thin-layer waveguide lenses formed with the help of the nematic liquid crystal (NLC) [1,2], including the imposition of an electric field [3][4][5][6][7], are investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The basis of most of the electro-and magneto-optical effects specific for LC is the director's (the axis of the predominant direction of molecules of a macroscopic volume of matter) reorientation under the action of a field or a fluid flow [1][2][3][4][5][6][7]. A change in the direction of the preferred orientation of the molecules (director) of the liquid crystal under the influence of an external electric (or magnetic) field leads to a significant change in the properties of the LC.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Egorov¹,

Ayriyan²,

Ayrjan³

2020

JRE

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Irregular nematic liquid crystal waveguide structures were investigated by the numeric simulation and experimentally. The dependence of attenuation coefficient (optical losses) of the waveguide modes and the effective sizes (correlation radii) of quasi-stationary irregularities of the liquid-crystal layer on the linear polarization of the incident laser radiation and the presence of pulse-periodic electric field were experimentally observed and investigated. An estimate is made of the correlation radii of liquid-crystal waveguide quasi-stationary irregularities. The observed decrease in the attenuation coefficient of the waveguide modes and the effective sizes of irregularities in the liquid-crystal layer, when the external electric field is switched on, explained by the effect of the decrease in the fluctuations correlation radii of the local orientation of the molecules of the liquid crystal. Experimental spectral density function of the statistical quasi-stationary nematic liquid crystal irregularities was restored and relevant statistical parameters are given. The obtained results are undoubtedly important for further research of dynamic processes inside non stationary waveguide liquid crystal layers, both from the theoretical point of view for understanding kinetic processes in the liquid crystals, and with practical,-in the organization and carrying out suitable experimental researches.

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Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Egorov¹,

Ayriyan²,

Ayrjan³

2020

JRE

View full text Add to dashboard Cite

show abstract

“…The establishment of the basic relationship between the properties of liquid crystals (LCs) and their structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] is important for various applications. The research in this field includes the development of a theoretical model for the object under study, considering its response to external actions (electric or magnetic fields, light, etc.…”

Section: Introductionmentioning

confidence: 99%

Computer simulation of the pulse-periodic electric field effect on the 2D director orientation of nematic liquid crystal. Experimental research of multimode nematic liquid crystal waveguides.

Ayriyan¹,

Ayryan²,

Egorov³

2021

JRE

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In this paper, we numerically investigate a two-dimensional differential equation describing the motion of a director of a nematic liquid crystal for the case of an alternating external electric field. The presence of the previously discovered accumulation effect has been confirmed by numerical modeling. A comparison is made with the case of a constant electric field, and also a qualitative comparison with an experiment is given. Incomplete agreement with experimental data indicates the need for further research. However, it should be noted that the constructed mathematical model of the phenomenon allows at this stage to obtain estimates that are sufficiently acceptable for experiment and correctly predict the dynamics of processes in liquid crystals. An analysis of the features of the propagation of quasi-waveguide modes in a liquid crystal waveguide showed that, in the case of dynamic processes, such effects as power exchange between coupled modes, leakage of modes, re-emission of modes into modes of a different order, etc., can be observed. The programs for numerical solution and computer modeling of two-dimensional parabolic partial differential equation were developed both in FORTRAN and C/C++. The results obtained are important for further investigation of dynamic processes inside non-stationary liquid crystal layers, both from a theoretical point of view for understanding kinetic processes in liquid crystals and from a practical point of view when organizing and conducting different experimental research.

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Properties of nematic LC planar and smoothly-irregular waveguide structures: research in the experiment and using computer modeling

et al. 2019

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Nematic liquid crystal planar and smoothly-irregular waveguide structures were studied experimentally and by the computer modeling. Two types of optical smoothly-irregular waveguide structures promising for application in telecommunications and control systems are studied by numerical simulation: liquid crystal waveguides and thin film solid generalized waveguide Luneburg lens. Study of the behavior of these waveguide structures where liquid crystal layer can be used to control the properties of the entire device, of course, promising, especially since such devices are also able to perform various sensory functions when changing some external parameters, accompanied by a change in a number of their properties. It can be of interest to researchers not only in the field of the integrated optics but also in some others areas: nano-photonics, optofluidics, telecommunications, and control systems. The dependences of the attenuation coefficient (optical losses) of waveguide modes and the effective sizes (correlation radii) of quasi-stationary irregularities of the liquid-crystal layers on the linear laser radiation polarization and on the presence of pulse-periodic electric field were experimentally observed. An estimate was made of the correlation radii of liquid-crystal waveguide quasi-stationary irregularities. The obtained results are undoubtedly important for further research of waveguide liquid crystal layers, both from the theoretical point of view, and practical – in the organization and carrying out new experimental researches, for example, when developing promising integrated-optical LC sensors.

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Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

Cited by 4 publications

References 4 publications

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Computer simulation of the pulse-periodic electric field effect on the 2D director orientation of nematic liquid crystal. Experimental research of multimode nematic liquid crystal waveguides.

Properties of nematic LC planar and smoothly-irregular waveguide structures: research in the experiment and using computer modeling

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