Study and Analysis of Light Scattering Loss in Irregular Integrated Optical Waveguides

Egorov, A. A.

doi:10.3103/s1541308x19030087

Cited by 3 publications

(47 citation statements)

References 17 publications

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“…In order to quantify the optical losses in the waveguide, computer photometry of photographs of the corresponding mode tracks was carried out. To determine the optical losses, we used the well-known expression [6,7]:…”

Section: Results Of the Study Of Nlc Structuresmentioning

confidence: 99%

“…where   The size of the NLC irregularities was estimated in accordance with the Rayleigh criterion. Having determined the loss  of the optical power in a waveguide in accordance with formula (1), it is possible to estimate the effective dimensions ef r of the irregularities of the LC layer in accordance with the approximate formula [6,7]:…”

Section: Results Of the Study Of Nlc Structuresmentioning

confidence: 99%

“…An important stimulus to this study is also a need for a waveguide method to investigate and measure physical parameters of NLC layers with a subwave resolution in correlation radii of orientation irregularities [7].…”

Section: Fig 1 2d Structure Of the Molecule Of Nlc 4-cyano-4'-pentymentioning

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 4 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: Results Of the Study Of Nlc Structuresmentioning

confidence: 99%

Section: Results Of the Study Of Nlc Structuresmentioning

confidence: 99%

Section: Fig 1 2d Structure Of the Molecule Of Nlc 4-cyano-4'-pentymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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Properties of liquid-crystal wave-guiding structures

et al. 2022

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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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Study and Analysis of Light Scattering Loss in Irregular Integrated Optical Waveguides

Cited by 3 publications

References 17 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.

Properties of liquid-crystal wave-guiding structures

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.

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