p-Terphenyl-containing symmetric tetraesters for nano-scale pitch ferroelectric liquid crystal materials

Krivoshey, Alexander I.; Mikhailenko, V. V.; Попова, Е. В.; Fedoryako, A. P.; Vashchenko, O. V.; Vlasenko, Hanna S.; Vashchenko, V. V.

doi:10.1016/j.molliq.2022.119051

Cited by 9 publications

(5 citation statements)

References 39 publications

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“…The CCs were synthesized using a similar approach described in Ref. [34]. The details of FLC materials synthesis are in Section S1.1–S1.3 (Supporting Information).…”

Section: Materials Designmentioning

confidence: 99%

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Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Sun,

Yuan,

Swaminathan

et al. 2023

Advanced Optical Materials

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This article presents an approach to achieve a fast and analog geometrical phase modulation based on the optical axis rotation of the defect‐free Deformed Helix Ferroelectric Liquid Crystal (DHFLC) with a short pitch. This study demonstrates a Spatial Light Modulator (SLM) prototype with a feature size of 3 µm without Fringe Field Effect (FFE), having a phase depth of 1.9π, fast switching time (<250 µs) at a low operating voltage (<7 V), and high diffraction efficiency (>77%). The high phase modulation depth is achieved by developing DHFLC with a cone angle of up to 85˚, which is inherently immune to FFE. The ellipticity is minimized by using a compensation film that can suppress the changes in birefringence under the applied electric field. The proposed SLM is promising in applications such as a real‐time hologram and dynamic beam steering in Light Ranging and Detector (LiDAR).

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“…The CCs were synthesized using a similar approach described in Ref. [34]. The details of FLC materials synthesis are in Section S1.1–S1.3 (Supporting Information).…”

Section: Materials Designmentioning

confidence: 99%

“…We started from the mixture FLC 587 [ 34 ] and considered it as our reference material. The FLC 587 show FFE‐free phase and amplitude modulation.…”

Section: Materials Designmentioning

confidence: 99%

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Sun,

Yuan,

Swaminathan

et al. 2023

Advanced Optical Materials

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“…To design a suitable short pitch FLC, we used the guest host approach, wherein the achiral host is mixed with one or multiple chiral guest molecules. The chiral components were synthesized using the similar approach described in Ref 42 . The details of FLC materials synthesis are given in Supplementary Materials 1.1-1.3.…”

Section: Materials Designmentioning

confidence: 99%

“…We started from the mixture FLC 587 42 and considered as our reference material. The FLC 587 show FFEfree phase and amplitude modulation 34 .…”

Section: Materials Designmentioning

confidence: 99%

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Srivast

Sun

Yuan

et al. 2023

Preprint

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This article shows a fast continuous 2π geometrical phase modulator based on the dynamic optical axis rotation of the short-pitch Ferroelectric Liquid Crystal (FLC). A continuous multi-level (8-bit) phase modulation, fast switching time (< 250 μs at 2 kHz), low operating voltage (< 7 V), and high diffraction efficiency (> 77%) is achieved using defect-free Deformed Helix Ferroelectric Liquid Crystal (DHFLC) for the first time. We showed a minimum feature size of 1 µm without fringe field effect (FFE). We also developed a new FLC with a cone angle of ~85˚ and a way to provide compensated half-wave condition (HW) during the entire electro-optical operational range. As a result, we achieve both spatial and time modulation with high frequency (1/3 μm-1 and 4 kHz, respectively), which can be used in applications such as a real-time hologram and dynamic beam steering in Light Ranging and Detector (LiDAR).

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“…Design and study of fluorinated and nonfluorinated p-terphenyl-containing symmetric tetraesters are described in [18]. They were used as chiral components of ferroelectric liquid crystal materials working in deformed helix ferroelectric mode (DHF).…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

Будынина¹,

Torgova²,

Kuznetsov³

et al. 2022

Liq. Cryst. and their Appl.

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The results of the synthesis and study of a new fluorinated achiral smectic C liquid crystal, namely, 2-(3-fluoro-4'-pentylbiphenyl-4-yl)-5-hexylpyrimidine, are presented. The possibility to use this compound as a matrix for ferroelectric liquid crystal (FLC) mixtures is evaluated. Two mixtures have been prepared: one (FLC-691-F) is based on new fluorinated compound and another (FLC-691) on its non-fluorinated analogue. The diester of optically active 2-octanol and terphenyldicarboxylic acid was used as a chiral dopant for both mixtures. Investigation of these FLC mixtures parameters: phase transition temperatures, helix pitch, spontaneous polarization and tilt angle show significant influence of fluorine atom. When comparing the phase sequence of FLC-691 and FLC-691-F mixtures, one can note that in the fluorine containing mixture an additional smectic A phase arises. At the same temperatures, the helix pitch of FLC-691-F is 2 – 2.5 times less than the helix pitch of FLC-691. The tilt angle of FLC-691-F is much smaller than that of FLC-691 but its value approaches the optimal value of 22.5 degrees, which ensures maximum light transmittance of electro-optical cells. At the same time the presence of fluorine atom in the matrix is a reason for the decrease of the mixture spontaneous polarization and a significant decrease (almost 4 times) in the driving voltage of electro-optical light shutters. As a result, it was shown that the fluorinated matrix provides new possibilities for controlling the mixture parameters.

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p-Terphenyl-containing symmetric tetraesters for nano-scale pitch ferroelectric liquid crystal materials

Cited by 9 publications

References 39 publications

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

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