Modeling of molecular reorientation in nematic liquid crystals

Sala, Filip A.; Bujok, Maksymilian; Karpierz, Mirosław A.

doi:10.4302/plp.2016.1.04

Photon. Lett. Poland

2016

DOI: 10.4302/plp.2016.1.04

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Modeling of molecular reorientation in nematic liquid crystals

Filip A. Sala

Maksymilian Bujok

Mirosław A. Karpierz

Abstract: Abstract-In this paper, the modeling of molecular reorientation in nematic liquid crystals is described. The theoretical model is based on Frank-Oseen elastic theory. By minimizing the equation on free energy, an equation describing molecular reorientation is obtained. To get a solution, two numerical methods (Successive Over-Relaxation and Multigrid) are employed and compared for the numerical results of director orientation and computation time.

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Cited by 2 publications

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Design of false color palettes for grayscale reproduction

Sala

2017

Displays

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Design of false color palette is quite easy but some effort has to be done to achieve good dynamic range, contrast and overall appearance of the palette. Such palettes, for instance, are commonly used in scientific papers for presenting the data. However, to lower the cost of the paper most scientists decide to let the data to be printed in grayscale. The same applies to e-book readers based on e-ink where most of them are still grayscale. For majority of false color palettes reproducing them in grayscale results in ambiguous mapping of the colors and may be misleading for the reader. In this article design of false color palettes suitable for grayscale reproduction is described. Due to the monotonic change of luminance of these palettes grayscale representation is very similar to the data directly presented with a grayscale palette. Some suggestions and examples how to design such palettes are provided.

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Design of false color palettes for grayscale reproduction

Sala

2017

Displays

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Optical steering of mutual capacitance in a nematic liquid crystal cell

Sala

Sala-Tefelska

2017

J. Opt. Soc. Am. B

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In this study a variable capacitor made of Nematic Liquid Crystal cell is proposed and analyzed theoretically. The mutual capacitance is steered with an optical beam of a Gaussian shape launched into the cell. The optical field changes the orientation of the molecules and affects the capacitance. By using Frank-Oseen elastic theory the molecular reorientation is simulated. The influence of various parameters on capacitance such beam width, anchoring condition, externally applied voltage, beam power and launching position is presented. For instance, the maximum tuning range is achieved for wide beams and the molecules initially aligned close to the propagation axis. It is also proved that launching position, especially for narrow beams, has limited influence on capacitance. The proposed component can be used, for instance, in optical power meters, as a feedback in laser or diode systems or just as a variable capacitor in optoelectronic circuits. One of the advantages of this device is that the beam passes through the element, so steering of the capacitance or measuring the parameters of the beam can be realized without splitting the beam. Moreover, due to the low thickness of the liquid crystal layer the attenuation is very low.

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Modeling of molecular reorientation in nematic liquid crystals

Cited by 2 publications

References 9 publications

Design of false color palettes for grayscale reproduction

Design of false color palettes for grayscale reproduction

Optical steering of mutual capacitance in a nematic liquid crystal cell

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