Duckles, Vincent H(arris)

Brett, Philip

doi:10.1093/gmo/9781561592630.article.08255

Cited by 2 publications

(2 citation statements)

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“…Nowadays the conoscopy is proved to be a useful tool for studying liquid crystal systems. It is used to detect biaxiality of NLCs [5,6] and to measure the pretilt angle in uniaxial liquid crystal cells [7,8]. Orientational structures and helix unwinding process in ferroelectric smectic liquid crystals were also studied by conoscopy in Refs.…”

Section: Introductionmentioning

confidence: 99%

Singularities in polarization resolved angular patterns: transmittance of nematic liquid crystal cells

Kiselev

2007

J. Phys.: Condens. Matter

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We study the angular structure of polarization of light transmitted through a nematic liquid crystal (NLC) cell by theoretically analyzing the polarization state as a function of the incidence angles. For a uniformly aligned NLC cell, the 4×4 matrix formalism and the orthogonality relations are used to derive the exact expressions for the transmission and reflection matrices. The polarization resolved angular patterns in the two-dimensional projection plane are characterized in terms of the polarization singularities such as C points (points of circular polarization) and L lines (lines of linear polarization). In the case of linearly polarized plane waves incident on the homeotropically aligned cell, we present the results of detailed theoretical analysis describing the structure of the polarization singularities. We apply the theory to compute the polarization patterns for various orientational structures in the NLC cell and discuss the effects induced by director orientation and biaxiality.

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Section: Introductionmentioning

confidence: 99%

Singularities in polarization resolved angular patterns: transmittance of nematic liquid crystal cells

Kiselev

2007

J. Phys.: Condens. Matter

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“…For example, this method was employed to detect biaxiality of NLCs [34,35] and to measure the pretilt angle in uniaxial liquid crystal cells [36,37]. Orientational structures and helix unwinding process in ferroelectric and antiferroelectric smectic liquid crystals were also studied by conoscopy in Refs.…”

Section: Introductionmentioning

confidence: 99%

Topological events in polarization resolved angular patterns of nematic liquid crystal cells at varying ellipticity of incident wave

Kiselev,

Vovk

2008

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We study the angular structure of polarization of light transmitted through a nematic liquid crystal (NLC) cell by analyzing the polarization state as a function of the incidence angles and the polarization of the incident wave. The polarization resolved angular (conoscopic) patterns emerging after the NLC cell illuminated by the convergent light beam are described in terms of the polarization singularities such as C-points (points of circular polarization) and L-lines (lines of linear polarization). For the homeotropically aligned cell, the Stokes polarimetry technique is used to measure the polarization resolved conoscopic patterns at different values of the ellipticity of the incident light, (inc) ell . impinging onto the cell. Using the exact analytical expressions for the transfer matrix we show that variations of the ellipticity, (inc) ell , induce transformations of the angular pattern exhibiting the effect of avoided L-line crossings and characterized by topological events such as creation and annihilation of the C-points. The predictions of the theory are found to be in good agreement with the experimental results.

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Duckles, Vincent H(arris)

Cited by 2 publications

References 0 publications

Singularities in polarization resolved angular patterns: transmittance of nematic liquid crystal cells

Singularities in polarization resolved angular patterns: transmittance of nematic liquid crystal cells

Topological events in polarization resolved angular patterns of nematic liquid crystal cells at varying ellipticity of incident wave

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