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1

Influence of the core size on light propagation in photonic liquid crystal fibers

Sala-Tefalska M. M., Ertman S., Woliński T. R., Mergo P.

Opto-Electronics Review

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2017

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Vol. 25, No. 3

198--204

EN

In this paper analyses of mode distribution, confinement and experimental losses of the photonic crystal fibers with different core sizes infiltrated with liquid crystal are presented. Four types of fibers are com-pared: with single-, seven-, nineteen-and thirty seven solid rods forming the core in the same hexagonal lattice of seven “rings” of unit cells (rods or capillaries). The experimental results confirming the influence of the core diameter on light propagation are also included. The diameter of cores determines not only the number of modes in the photonic liquid crystal fiber but also is correlated with experimentally observed attenuation. For fibers with larger cores confinement losses are expected to be higher, but the measured attenuation is smaller because the impact of liquid crystal material losses and scattering is smaller.

2

Tunability of discrete diffraction in photonic liquid crystal fibres

Rutkowska K. A., Laudyn U. A., Jung P. S.

Opto-Electronics Review

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2014

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Vol. 22, No. 4

207-217

EN

In this paper theoretical and experimental results regarding discrete light propagation in photonic liquid crystal fibres (PLCFs) are presented. Particular interest is focused on tunability of the beam guidance obtained due to the variation in either external temperature or optical power (with assumption of thermal nonlinearity taking place in liquid crystals). Highly tunable (discrete) diffraction and thermal self-(de)focusing are studied and tested in experimental conditions. Specifically, spatial light localization and/or delocalization due to the change in tuning parameters are demonstrated, with possibility of discrete spatial (gap) soliton propagation in particular conditions. Results of numerical simulations (performed for the Gaussian beams of different widths and wavelengths) have been compared to those from experimental tests performed in the PLCFs of interest. Owning to the limit of experimental means, direct qualitative comparison was not quite accessible. Nevertheless, a qualitative agreement between theoretical and experimental data (obtained in analogous conditions) has been achieved, suggesting a compact and widely-accessible platform for the study of tunable linear (and nonlinear) discrete light propagation in two-dimensional systems. Proposed photonic structures are of a great potential for all-optical beam shaping and switching.

3

Liquid crystal alignment in cylindrical microcapillaries

Chychłowski M., Yaroshchuk O., Kravchuk R., Woliński T.

Opto-Electronics Review

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2012

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Vol. 20, No. 1

47-52

EN

A variety of alignment configurations of liquid crystals (LCs) inside the glassy cylindrical capillaries is realized by using alignment materials providing different anchoring. The radial configuration with central disclination line is obtained for homeotropic boundary conditions. In turn, the axial, transversal and tilted alignment structures are realized by using materials for planar anchoring. The uniformity and controlling of the latter structures were provided by photoalignment method. This approach can be further used to control LC alignment in the photonic crystal fibers recognized as advanced elements for different optical devices.

4

Fotoniczne światłowody ciekłokrystaliczne jako całkowicie światłowodowe układy czujnikowe

Woliński T., Chychłowski M., Czapla A., Dąbrowski R., Domański A. W., Ertman S., Godyń K., Nowinowski-Kruszelnicki E., Tefelska M., Wójcik J.

Elektronika : konstrukcje, technologie, zastosowania

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2008

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Vol. 49, nr 6

199-200

PL

W pracy przedstawiono najnowsze wyniki badań nad ciekłokrystalicznymi światłowodami fotonicznymi pod wpływem zewnętrznych oddziaływań, takich jak temperatura, pole elektryczne i ciśnienie hydrostatyczne. Zaprezentowano również potencjalne możliwości zastosowania ciekłokrystalicznych światłowodów fotonicznych do budowy wieloparametrowych czujników nowej generacji.

EN

In this paper latest research activities on photonic liquid crystal fibers under the influence of external fields such as temperature, electric field and hydrostatic pressure were presented. Potential application possibilities of the photonic liquid crystal fibers to multi-parameter sensing are also discussed.