Polymer-stabilized supercooled blue phase

Choi, Hyunseok; Higuchi, Hiroki; Ogawa, Yukiko; Kikuchi, Hirotsugu

doi:10.1063/1.4752461

Cited by 25 publications

(32 citation statements)

References 35 publications

(38 reference statements)

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“…However, practical applications are hindered by intrinsic problems, the most serious of which is a narrow temperature range of BPs. Two approaches have been demonstrated to extend the BPs temperature range [5][6][7] . The first one is a polymer-stabilized blue phase (PSBP) 5,7 .…”

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confidence: 99%

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Blue-phase-polymer-templated nematic with sub-millisecond broad-temperature range electro-optic switching

Xiang

Lavrentovich

2013

Applied Physics Letters

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We report on fast electro-optic switching (response time 0.1 ms) of a blue-phase-polymer templated nematic with a broad-temperature range of thermodynamic stability and hysteresis-free performance. The nematic fills a polymer template that imposes a periodic structure with cubic symmetry and submicron period. In the field-free state, the nematic in polymer template is optically isotropic. An applied electric field causes non-zero optical retardance. The approach thus combines beneficial structural and optical features of the blue phase (cubic structure with submicron periodicity) and superior thermodynamic stability and electro-optic switching ability of the nematic filler.Blue phases (BPs) of liquid crystals (LCs) represent an example of a frustrated soft matter system 1,2 . They are formed by chiral molecules that tend to arrange locally into structures with two axes of twist (so-called double twist). Although locally the double-twist is preferable than the single-twist structure (typical of standard cholesteric LCs), it cannot extend itself to fill the entire volume and needs to be stabilized by a lattice of topological defects-disclinations 1,2 . At the cores of disclinations, orientational order is reduced, so that the material can be considered as partially melted. This is why the BPs are typically observed only within a close proximity (one-two degrees) of the isotropic phase. Depending on arrangements of ordered and disordered regions, one distinguishes three classes of the BPs: BPI (body-centered cubic structure), BPII (simple cubic structure) and BPIII (amorphous lattice) 1,2 . In absence of an electric field, the BPs are optically isotropic, i.e., they show no birefringence. . One might hope to formulate a suitable PSBP or BP composition by using a broad-temperature range nonchiral nematic and doping it with a chiral additive, but the latter often reduces the temperature range of the resulting mixture and makes the electrooptic performance very temperature-sensitive 13 . The status of current research makes it clear that the material properties that are beneficial for the temperature stability of BPs are not necessarily beneficial for electro-optic performance. In this work, we propose an electro-optically switchable BP-polymertemplated nematic (BPTN) in which the specially formulated BP mixture is used only to create a

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confidence: 99%

“…Two approaches have been demonstrated to extend the BPs temperature range [5][6][7] . The first one is a polymer-stabilized blue phase (PSBP) 5,7 . One of its drawbacks is hysteresis of electrooptic response 8 .…”

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confidence: 99%

Blue-phase-polymer-templated nematic with sub-millisecond broad-temperature range electro-optic switching

Xiang

Lavrentovich

2013

Applied Physics Letters

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“…For PSBPI, the independent defect lines stabilized by the polymers do not contact one another inside the unit lattice [7,12]. By contrast, the defect lines of BPII have an intersection point at the center of the unit lattice [7,12]. Hence, PSBPII is expected to be more robust against lattice deformation by an applied electric field compared with PSBPI.…”

Section: Psbpiimentioning

confidence: 99%

“…In addition, the PSBPII samples showed robustness against lattice deformation because there was barely any shift in the Bragg reflectance wavelengths when the samples were subjected to an applied electric field. For PSBPI, the independent defect lines stabilized by the polymers do not contact one another inside the unit lattice [7,12]. By contrast, the defect lines of BPII have an intersection point at the center of the unit lattice [7,12].…”

Section: Psbpiimentioning

confidence: 99%

Robust and monodomain-like polymer-stabilized simple cubic blue phase with red, green, and blue reflective colors

Bae

Kim

et al. 2017

Journal of Information Display

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In this work, polymer-stabilized simple cubic blue phase (PSBPII) samples with three reflective elementary colors (red, green, and blue) were successfully fabricated. The PSBPII samples showed uniform alignment after rubbing treatment, and a wide temperature range of over 40-50°C, including room temperature. They also exhibited robustness against lattice deformation by an applied electric field. ARTICLE HISTORY

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“…They like to find the most optimal condition for display operation using BPs. [206,[212][213][214][215][216][217][218][219] Recently BP was also proposed for light modulation in photonic crystal fibres as relatively low losses and polarisation insensitive materials. [219] It is considered that the amorphous polymer chains are selectively concentrated along the declination lines, and they stabilised the lattice structure of BP.…”

Section: Conclusion Of Raszewski Andmentioning

confidence: 99%

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

Dąbrowski

2015

Liquid Crystals

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The significance of Gray's cyanobiphenyls in the discovery of the partially bilayer smectic A phase (SmA d ) and in the formulation of mixtures exhibiting the blue phase is described. The properties of the SmA d phase and its relationships to molecular structures are reviewed. Induced phenomena such as the transformation of nematics into smectics, SmA d or SmA 1 , as well as the opposite transformation of smectics into nematics are described and discussed.

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Polymer-stabilized supercooled blue phase

Abstract: Reversible optical control of transmittance in polymer/liquid crystal composite films by photoinduced phase transition

Cited by 25 publications

References 35 publications

Blue-phase-polymer-templated nematic with sub-millisecond broad-temperature range electro-optic switching

Blue-phase-polymer-templated nematic with sub-millisecond broad-temperature range electro-optic switching

Robust and monodomain-like polymer-stabilized simple cubic blue phase with red, green, and blue reflective colors

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

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