Optical and electro‐optical properties of bimesogenic organosiloxane antiferroelectric liquid crystals with molecular tilt approaching 45 degrees

Pivnenko, Mikhail N.; Lehmann, P.; Komitov, L.; Coles, H. J.

doi:10.1080/02678290412331329297

Cited by 10 publications

(11 citation statements)

References 28 publications

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“…5 To the best of our knowledge, the first to bring attention to the remark by De Meyere et al were Lagerwall and co-workers. [84] After they did so, some researchers recently published observations on organosiloxane bimesogens [94,100] that were essentially identical to those in the reports published by D'havØ et al in 2000 and Lagerwall et al in 2001, [84,85] but denying the importance of the seminal work of the D'havØ/Rudquist/Lagerwall team. Instead they cite only the De Meyere paper as the historical source.…”

Section: Solution Of the Static Dark-state Problem In Antiferroelectrmentioning

confidence: 71%

“…Indeed, Pivnenko et al have reported switching times reaching tens of seconds. [94] Bimesogenic orthoconic AFLCs are also notoriously difficult to align, as can be seen, for instance, in the spontaneously formed texture outside the electrode area in Figure 22 and in the texture examples in refs. [93,94].…”

Section: Aflc Materials Exhibiting High Director Tiltmentioning

confidence: 93%

“…[94] Bimesogenic orthoconic AFLCs are also notoriously difficult to align, as can be seen, for instance, in the spontaneously formed texture outside the electrode area in Figure 22 and in the texture examples in refs. [93,94]. Not only is a certain uniformity in layer-normal direction desirable for an efficient bright state, but also the most important alignment requirement is that a nonhelical, horizontal tilt-plane state forms spontaneously.…”

Section: Aflc Materials Exhibiting High Director Tiltmentioning

confidence: 93%

“…[103][104][105] Lately, the orthoconic effect has also been found in several other materials (some of them are depicted in Table 3), quite different from the initially used mixture (which will be discussed in more detail below): in bent-core mesogens, [106,107] in a bistereogenic AFLC (M7BBM7) structurally related to MHTAC, [90] in a "twin AFLC mesogen" compound (BMHBOP-8), [88] and recently also in a siloxane bimesogen (Br11-3-11Br). [94] Siloxane bimesogens are actually some of the best-studied, high-tilt AFLCs, which have been investigated repeatedly since 1997. [92-94, 108, 109] Nevertheless, the orthoconic effect was not observed until now, probably due to insufficient surface stabilization in the earlier studies.…”

Section: Solution Of the Static Dark-state Problem In Antiferroelectrmentioning

confidence: 99%

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Current Topics in Smectic Liquid Crystal Research

2006

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Interest in the smectic liquid-crystalline state of matter received a substantial boost with the discovery by Meyer in the mid-1970s that a chiral smectic C (SmC*) phase exhibits a spontaneous electric polarization, and with the subsequent demonstration by Clark and Lagerwall of the surface-stabilized SmC* ferroelectric liquid crystal at the beginning of the 1980s. Since then, chiral smectic phases and their plethora of polar effects have dominated the research in this field, which today has reached a mature state where the first commercial microdisplay applications are now shipping in millions-per-year quantities. In this Review we discuss some of the topics of highest interest in current smectic liquid crystal research, and address application-relevant research (de Vries-type tilting transitions without defect generation and high-tilt antiferroelectric liquid crystals with perfect dark state) as well as more curiosity-driven research (the nature and origin of the chiral smectic C subphases and their intermediate frustrated states between ferro- and antiferroelectricity).

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Section: Solution Of the Static Dark-state Problem In Antiferroelectrmentioning

confidence: 71%

Section: Aflc Materials Exhibiting High Director Tiltmentioning

confidence: 93%

Section: Aflc Materials Exhibiting High Director Tiltmentioning

confidence: 93%

Section: Solution Of the Static Dark-state Problem In Antiferroelectrmentioning

confidence: 99%

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Current Topics in Smectic Liquid Crystal Research

2006

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“…The siloxane groups, besides determining these properties and allowing the cone angle to be controlled at will, give a much improved resistance to mechanical shock. They show excellent bistability, or indeed tri-stability with hysteresis-free V-shaped switching in the latter case 9 . These materials have been incorporated into polymer matrices leading to flexible displays 10 , as well as telecommunications phase modulators.…”

Section: Introductionmentioning

confidence: 98%

From nanostructured liquid crystals to electro-optic devices and lasers

Coles

2004

SPIE Proceedings

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We have recently shown that bimesogenic liquid crystals exhibiting chiral nematic and smectic (SmA, SmA* or C*) phases have macroscopic electro-optic properties that make them very interesting for both display and non-display applications. Since materials have been synthesised where the optical effect observed could be due to scattering power, birefringence, dichroism, fluorescence and optical-nonlinearity (SHG and THG), and where the principle optical axis can be rotated in any direction through 90º in times of the order of microseconds at moderate fields, i.e., 1-10V per micron, then this suggests an exciting variety of new optoelectronic applications. In this paper we will describe nanoscopic design protocols, molecular templating effects and the molecular properties important for these systems. Specifically we will consider bimesogenic SmC* incorporating siloxane linking groups that exhibit either ferroelectric or anti-ferroelectric phases depending on the number of silicon atoms in the siloxane moiety using the same mesogens. The siloxane configuration leads to a molecular template effect observed on the macroscopic scale as synclinic or anticlinic phases. Unusually these materials have cone angles of up to and including 90º which makes them ideal for high contrast displays, phase elements, photonics transducers and lasers.

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Microsegregation in Polyphilic Calamitic, Disklike,and Bent‐Core Mesogens

Tschierske

2014

Handbook of Liquid Crystals

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Optical and electro‐optical properties of bimesogenic organosiloxane antiferroelectric liquid crystals with molecular tilt approaching 45 degrees

Cited by 10 publications

References 28 publications

Current Topics in Smectic Liquid Crystal Research

Current Topics in Smectic Liquid Crystal Research

From nanostructured liquid crystals to electro-optic devices and lasers

Microsegregation in Polyphilic Calamitic, Disklike,and Bent‐Core Mesogens

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