High birefringence bistolane liquid crystals: synthesis and properties

Węgłowska, Dorota; Kula, Przemysław; Herman, Jakub

doi:10.1039/c5ra15291g

Cited by 53 publications

(16 citation statements)

References 42 publications

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“…The above thermal parameters decrease on replacing ether linkages with thioether linkages. Such a trend is ascribed to the more bent geometry and flexibility of thioether‐containing dimers, which is fundamentally in agreement with previous observations for rodlike mesogens …”

Section: Resultssupporting

confidence: 92%

“…Such at rend is ascribed to the more bent geometry and flexibility of thioether-containing dimers, [56] which is fundamentally in agreement with previousobservations for rodlike mesogens. [61][62][63][64][65] In addition, the phase transitions of dimers 1, 2,a nd 3 were compared with those of the corresponding cyanobiphenyl counterparts 8, 9,a nd 10,r espectively. We revisited the phasetransition behavior of 8 to obtain its cooling data.…”

Section: Resultsmentioning

confidence: 99%

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Ether‐ and Thioether‐Linked Naphthalene‐Based Liquid‐Crystal Dimers: Influence of Chalcogen Linkage and Mesogenic‐Arm Symmetry on the Incidence and Stability of the Twist–Bend Nematic Phase

Arakawa

Ishida

Tsuji

2020

Chemistry A European J

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The twist–bend nematic (NTB) phase with a heliconical nanostructure of the local director generating symmetry breaking by achiral bent‐shaped molecules is a hot topic of current liquid‐crystal science. As opposed to the most common methylene‐linked dimers, this study demonstrates chalcogen ether‐ and/or thioether‐linked 6‐(4‐cyanophenyl)‐2‐naphthyl‐based liquid‐crystal dimers with symmetric and asymmetric π‐conjugated mesogenic‐arm structures that exhibit the NTB phase. Although the symmetric bis(ether)‐linked dimer exhibits only the conventional nematic (N) phase, the asymmetric bis(ether)‐linked dimer can form the NTB phase. All thioether‐linked dimers form the NTB phase, wherein the dimers with asymmetric arms vitrify in the NTB phase on cooling to room temperature. The phase transitions are discussed in terms of the chalcogen linkage combination, mesogenic‐arm symmetry, and spacer length. It is revealed that thioether‐linked dimers based on asymmetric π‐conjugated mesogenic arms with terminal cyano groups are highly beneficial for the realization of materials that form a wide range of NTB phases and glassy NTB states at room temperature.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Ether‐ and Thioether‐Linked Naphthalene‐Based Liquid‐Crystal Dimers: Influence of Chalcogen Linkage and Mesogenic‐Arm Symmetry on the Incidence and Stability of the Twist–Bend Nematic Phase

Arakawa

Ishida

Tsuji

2020

Chemistry A European J

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“…When employing a mirror-based beam deflector, the theoretical maximum of the tuning range is 180°. Although an Δn value of 0.356 is still far below the technical limit reported to date (Δn ≈ 0.6), [38] such high-birefringence materials are usually not commercially available. Figure S4, Supporting Information); it is a universal (independent-of-operating wavelength) solution calculated by fixing n o to 1.532.…”

Section: Wwwadvopticalmatdementioning

confidence: 86%

Arbitrary Beam Steering Enabled by Photomechanically Bendable Cholesteric Liquid Crystal Polymers

Chen

et al. 2017

Advanced Optical Materials

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Beam-steering technology is now in widespread use in a variety of optical systems, spanning from fiber-optic interconnector to Lidar. Most current techniques are based on optical grating diffractions; they are thus subject to not only finite tuning range, direction, and efficiency but also complex inorganic fabrication and circuit design. A high-degree-of-freedom beamsteering element makes such operations more efficient and versatile. Azobenzene cholesteric liquid crystal polymer (azo-ChLCP) can be regarded as a soft self-assembled Bragg mirror capable of being bent photomechanically. With proper control of pump polarization and exposure time, the output beam can be directly steered to an arbitrary direction. The deflection efficiency was achieved to be at least 90% with an angular tuning range of ≈54°, which is markedly superior to conventional grating-based devices. Additionally, the angle of deflection is independent of wavelength, preventing the deflected beam from spreading out with colors. This work demonstrates and characterizes the azo-ChLCP beam deflector, which features optical tunability, high efficiency, wide tuning range, and polarization-selective deflection direction, making a significant breakthrough in beam-steering technology.

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“…[37]) and consider a y-polarized dipole emitter at the center of the slab. The material outside the crystal is assumed to have a refractive index of 1.6.…”

Section: Verificationmentioning

confidence: 99%

Generation of light in spatially dispersive materials

et al. 2017

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Spatial dispersion makes optical properties of materials depend on the direction of light propagation. The effect can be applied to control optical emission by sources embedded in such media. We propose a method to determine the radiation pattern of essentially any emitter located in a general spatially dispersive and optically anisotropic medium. The method is based on a decomposition of the source into waves of electric current, each creating optical plane waves whose properties are determined by the wave parameters, the refractive index, and impedance. The method is computationally fast and very accurate even in strongly spatially dispersive plasmonic metamaterials. In particular, we observe large modification of dipole emission in a bifacial and a diffraction-compensating metamaterial. The method is applicable to a large variety of nanostructured materials and, therefore, we believe that it can find numerous applications in nano-optics.

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High birefringence bistolane liquid crystals: synthesis and properties

Abstract: Twenty both symmetrical and non-symmetrical bistolanes with terminal alkyl, alkoxy and alkylsulfanyl chain and lateral methyl or ethyl group have been synthesized via Sonogashira cross-coupling and their mesomorphic properties have been studied.

Cited by 53 publications

References 42 publications

Ether‐ and Thioether‐Linked Naphthalene‐Based Liquid‐Crystal Dimers: Influence of Chalcogen Linkage and Mesogenic‐Arm Symmetry on the Incidence and Stability of the Twist–Bend Nematic Phase

Ether‐ and Thioether‐Linked Naphthalene‐Based Liquid‐Crystal Dimers: Influence of Chalcogen Linkage and Mesogenic‐Arm Symmetry on the Incidence and Stability of the Twist–Bend Nematic Phase

Arbitrary Beam Steering Enabled by Photomechanically Bendable Cholesteric Liquid Crystal Polymers

Generation of light in spatially dispersive materials

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