The effect of locations of triple bond at terphenyl skeleton on the properties of isothiocyanate liquid crystals

Li, Juanli; Li, Jian; Hu, Minggang; Che, Zhaoyi; Mo, Lingchao; Yang, Xiaozhe; Zhang, Lu

doi:10.1080/02678292.2017.1280190

Cited by 18 publications

(3 citation statements)

References 32 publications

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“…One the other hand, a 2 μm-thick ITO glass cell with SD1 inter coating on both substrates is also exposed to the interference pattern with the same illumination condition, and then a nematic LC material HM2 with high birefringence Δn = 0.37 [29] is filled into the patterned cell by capillary action. A 632.8 nm He-Ne laser is used as probe beam to investigate the diffraction property of the tunable grating to avoid pattern erasing, and a sinusoidal ac voltage is applied to the cell to adjust the LC phase retardation.…”

Section: Simulation and Experimentalmentioning

confidence: 99%

Photoalignment-induced two-dimensional liquid crystal polarization structure via multi-beam polarization interferometry

Shi¹,

Liu²,

Song³

et al. 2018

Opt. Express

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A two-dimensional (2D) pure polarization pattern via four-beam polarization interferometry of circularly polarized beams is demonstrated both theoretically and experimentally. The polarization orientation of the interference pattern is recorded by an azobenzene photoalignment layer and transferred to liquid crystal (LC), enabling the fabrication of a 2D liquid crystal (LC) chiral structure. This structure behaves as a 2D LC polarization grating (LCPG) that can generate multiple polarization-selective diffraction beams of orthogonal polarization states with high efficiency. This 2D LCPG provides an effective way to distribute an optical signal into multiple receivers by both incidence polarization control and external electric field, therefore offering potential applications on multi-channel optical communication and information processing.

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Section: Simulation and Experimentalmentioning

confidence: 99%

Photoalignment-induced two-dimensional liquid crystal polarization structure via multi-beam polarization interferometry

Shi¹,

Liu²,

Song³

et al. 2018

Opt. Express

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“…However, due to the increase of conjugated chain length and intermolecular force, the phenyltolane NCS liquid crystals usually show problems, such as high melting point and wide smectic phase temperature range, resulting in poor compatibility with other liquid crystal compounds. We designed new multi-fluorinated phenyl-tolane NCS compounds 4~6 [22], and the typical molecular structures are shown in Figure 2. The phase transition temperature and birefringence of the synthesized new liquid crystal compounds 4~6 and the known compounds 4r and 6r for comparison are shown in Table 2.…”

Section: Multi-fluorinated Phenyl-tolane Ncs Liquid Crystal Compoundsmentioning

confidence: 99%

P‐12.12: Development and Application of High Birefringence Liquid Crystal Materials

Li¹,

Li²,

Hu³

et al. 2023

Symp Digest of Tech Papers

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The development of new liquid crystal optoelectronic devices, including laser phase modulation, microwave and terahertz devices, requires liquid crystal materials with high birefringence. In this paper, three new molecular design strategies are proposed, including the introduction of olefin chain, lateral fluorine substitution and new ring core. Four new series of isothiocyanate liquid crystal compounds with high birefringence, low melting point and wide nematic temperature range were synthesized. Based on these new liquid crystal compounds, a liquid crystal mixture with nematic temperature range of ‐40~146 ºC and birefringence of 0.42 was developed. At 19 GHz, the new liquid crystal mixture shows excellent dielectric properties, with dielectric anisotropy of 1.28 and dielectric loss of 0.0087. The new liquid crystal mixture also has very low viscoelastic coefficient. The results at 1550nm and 60 ºC show that the response speed can reach 3.6 milliseconds with 2π phase modulation in the reflection mode.

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“…Various terphenyls and tolanes have been developed for high ∆n LCs [48,49]. Although many precise modifications of the molecular chemical structures have been mentioned [50][51][52], such as shifting the location of the mesomorphic core, introducing the lateral substituents into different positions and the various terminals, the high γ 1 of terphenyls and the poor UV stability of tolanes remains unsolved [53]. Those are the properties not intended to be compromised.…”

Section: Lc Materials Optimization Strategiesmentioning

confidence: 99%

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Huang

Liao²,

Chen

et al. 2018

Applied Sciences

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In this paper, we review liquid-crystal-on-silicon (LCoS) technology and focus on its new application in emerging augmented reality (AR) displays. In the first part, the LCoS working principles of three commonly adopted LC modes—vertical alignment and twist nematic for amplitude modulation, and homogeneous alignment for phase modulation—are introduced and their pros and cons evaluated. In the second part, the fringing field effect is analyzed, and a novel pretilt angle patterning method for suppressing the effect is presented. Moreover, we illustrate how to integrate the LCoS panel in an AR display system. Both currently available intensity modulators and under-developing holographic displays are covered, with special emphases on achieving high image quality, such as a fast response time and high-resolution. The rapidly increasing application of LCoS in AR head-mounted displays and head-up displays is foreseeable.

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The effect of locations of triple bond at terphenyl skeleton on the properties of isothiocyanate liquid crystals

Cited by 18 publications

References 32 publications

Photoalignment-induced two-dimensional liquid crystal polarization structure via multi-beam polarization interferometry

Photoalignment-induced two-dimensional liquid crystal polarization structure via multi-beam polarization interferometry

P‐12.12: Development and Application of High Birefringence Liquid Crystal Materials

Liquid-Crystal-on-Silicon for Augmented Reality Displays

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