Unique Electro-Optical Properties of Liquid Crystals Designed for Molecular Optics

Lagerwall, S. T.; Dahlgren, A.; Jägemalm, P.; Rudquist, P.; D’havé, K.; Pauwels, H.; Dąbrowski, R.; Drzewinski, W.

doi:10.1002/1616-3028(200104)11:2<87::aid-adfm87>3.3.co;2-5

Cited by 27 publications

(33 citation statements)

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“…For a few years we have been intensively searching the liquid crystal orthoconic antiferroelectrics because of their unusual optical properties ensuring a perfect dark state and consequently a very high contrast [1].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Żurowska

Dąbrowski

Dziaduszek

et al. 2008

Opto-Electronics Review

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Żurowska

Dąbrowski

Dziaduszek

et al. 2008

Opto-Electronics Review

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“…The half cone angle of ortho− conic AFLCs (OAFLCs) is 45°, making them isotropic for normal incident light and increasing dramatically the cell contrast. An unswitched orthoconic cell can be rotated between crossed polarisers with theoretically null transmis− sion [3]. Although PE is not fully avoided in orthoconics, their dynamic contrast under passively multiplexed addressing is enhanced as well.…”

Section: Introductionmentioning

confidence: 99%

Influence of a helical pitch on orthoconic antiferroelectric liquid crystals performance

Bennis

Dąrowski

Rejmer

et al. 2011

Opto-Electronics Review

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Orthoconic antiferroelectric liquid crystals, whose half cone angle is 45°, are of interest in display technology because they are capable of providing greyscale in passively addressing waveform while exhibiting very good contrast. However, orthoconic antiferroelectrics having short pitch are difficult to be aligned, this makes surface stabilized alignment unfeasible. In this case, dynamic behaviour is usually poor, avoiding electronic addressing with standard electronics. In this work, we report the helical pitch measurements of OAFLC mixtures and we compare electrooptical performance of high and low pitch OAFLCs.

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“…Tilts of the molecules in adjacent layers of antiferroelectric smectic C phase ͑SmC A * ͒ are oppositely directed and there is no net polarization. [1][2][3][4][5][6][7][8] In antiferroelectric SmC A * phase, two relaxation modes can be expected, one with a lower frequency region in the order of a few hertz and the other with a higher frequency region. Several research groups have defined both relaxations, though in a different fashion.…”

Section: Introductionmentioning

confidence: 99%

“…Several research groups have already reported that such perfect dark state problem can be removed by using OAFLC having tilt angle of approximately 45°. [1][2][3][4][5][6][7][8] Because of this, the importance of research in OAFLC has made a tremendous progress in recent times. It has also been reported that pretransitional effect and, thus, dynamic light leakage are minimized or even rendered completely absent by using OAFLC molecules.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical properties of an orthoconic liquid crystal mixture (W-182) and its molecular dynamics

Nayek

Kundu

Roy

et al. 2008

Journal of Applied Physics

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We observed that the perfect dark state problem could be solved by using orthoconic antiferroelectric liquid crystal ͑OAFLC͒ instead of normal AFLC by comparing the properties of isocontrast and dispersion chromaticity of W-182 OAFLC and normal AFLC CS-4001. We electro-optically observed that several subphases such as SmC ␥ * , SmC * ␤ , SmC * ␣ and antiferroelectric SmI * A phases exist in W-182 OAFLC. We dielectrically observed in 4 m thin cell that during heating, several new phases appeared. In the high temperature antiferroelectric region, a higher order than SmC * phase could be detected dielectrically, in the temperature range of 91-98°C, behaving similar to SmC ␥ * and also, another phase below SmC * region could be dielectrically detected in the temperature range of 103-1100°C, behaving similar to SmC ␣ * , and an antiferroelectric, similar to SmI A * phase, was observed in the lower temperature region of the antiferroelectric phase; those are definitely arising due to surface force and interfacial charges interactions. We observed both P H and P L relaxation modes in both cells, although they differed in their strength and relaxation frequency. We studied extensively our observations of P H and P L modes in the antiferroelectric region, a Goldstone mode in the ferroelectric region and a soft mode in the ferroelectric region and SmA * phases.

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Unique Electro-Optical Properties of Liquid Crystals Designed for Molecular Optics

Cited by 27 publications

References 0 publications

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Influence of a helical pitch on orthoconic antiferroelectric liquid crystals performance

Electro-optical properties of an orthoconic liquid crystal mixture (W-182) and its molecular dynamics

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