Polarisation-dependent dielectric processes in ferroelectric liquid crystals

Bawa, Ambika; Gangwar, Lokesh K.; Dhingra, Aastha; Choudhary, Amit; Rajesh, Rajesh; Singh, Surinder P.; Haase, Wolfgang; Biradar, A. M.

doi:10.1080/02678292.2018.1480805

Cited by 22 publications

(3 citation statements)

References 18 publications

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“…These changes are most significant at transition temperatures. A simple and interesting method of finding these transitions is visual phase identification method (10)(11)(12)(13)(14) . For this purpose a research polarizing microscope (Model No.…”

Section: Methodsmentioning

confidence: 99%

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Warsi¹,

Manohar²

2022

IJST

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Objectives: The Phase transition scheme of Ferroelectric Liquid Crystal (FLC) sample has been studied in a temperature range 50 0 C to 95 0 C. Methods: The material was procured from Merck, Germany and was used as such without any further purification, and studied for the measurement of optical rotation and transmittance. The Polarizing Optical Microscopy (POM) technique has been used and the different phases existing in the sample were observed by placing the sample having planar alignment under crossed polarizer arrangement. Findings: The sharp variation in the values of optical rotation and transmittance at the phase transition points clearly indicates that the different phases exist in the experimental sample. From the LDR vs Temperature and Optical Rotation vs Temperature study, four different phases for the sample were obtained. The SmC* phase exists in the temperature range 30 0 C

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Section: Methodsmentioning

confidence: 99%

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Warsi¹,

Manohar²

2022

IJST

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“…Similarly, in thin cells (less than 5 µm), the surface effect is dominant and bulk effect gets neglected. In moderately thick cells in between 5 and 20 µm, the surface and bulk effects can be seen, of course, it also depends upon the surface anchoring energy, P s , pitch value etc of the FLC materials [16,17].…”

Section: Dielectric Spectroscopy: Selection Of Flc Materialsmentioning

confidence: 99%

“…The new relaxation process, caused by the interface of FLC and strongly anchored alignment layer interaction, is always found at lower frequency than the phase fluctuation i.e. GM process and is found dependent on various other parameters like probing AC voltage [14], DC bias voltage, temperature [15,16], spontaneous polarization (P s ) [17]. On the other hand, if the rubbing strength is kept weak, the new relaxation mode is observed in surface stabilized cells [6].…”

Section: Introductionmentioning

confidence: 97%

Alignment layer and helix controlled unconventional operational switching in ferroelectric liquid crystal

Choudhary¹,

Bawa²,

Gangwar³

et al. 2021

J. Phys. D: Appl. Phys.

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Substrate interface driven helical unwinding led dynamical switching is observed and analysed for the low voltage operation switching of ferroelectric liquid crystal (FLC). The surface driven FLC molecules force the bulk molecules to switch the sample cell device at very low voltage as compared to conventional cells. It has been shown in the present investigation using three FLC materials that the surface anchoring of the FLC molecules and the thickness of the cell play a primary role for such devices because these conditions contrive the surface interface particle helical unwinding which is very essential for the low power switching. However, P s, helical pitch value, and the dielectric strength parameters of the FLC materials are also taken into account for the analysis of bulk switching assisted by interfacial switching. Dielectric and electro-optics investigation has proven that once the relaxation process associated with the interface is confirmed by dielectric spectra then only, the low power operation is observed in the sample which is interesting for fundamental and potential electro optical devices application.

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Low-frequency dielectric processes in deformed helix ferroelectric liquid crystals

et al. 2020

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Polarisation-dependent dielectric processes in ferroelectric liquid crystals

Cited by 22 publications

References 18 publications

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Alignment layer and helix controlled unconventional operational switching in ferroelectric liquid crystal

Low-frequency dielectric processes in deformed helix ferroelectric liquid crystals

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