Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant

Hassanein Shaban; Po Chang Wu; Jia Hong Lee; Wei Lee

doi:10.1364/OME.437701

Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant

Hassanein Shaban, Po Chang Wu, Jia Hong Lee, Wei Lee^*

^*Corresponding author for this work

Institute of Imaging and Biomedical Photonics

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Cetyltrimethylammonium bromide (CTAB) was employed as an ionic dopant dispersed into a nematic liquid crystal characterized by its negative dielectric anisotropy. The electrohydrodynamic (EHD) effect in liquid crystal cells impregnated with various contents of CTAB was studied by dielectric spectroscopy and the corresponding electro-optical responses of the cells driven by an AC electric field were investigated. Compared with the undoped counterpart, the frequency range of the EHD regime after doping with 0.2-wt% CTAB into the liquid crystal was widened, and distinct optical textures, including dynamic scattering, stripes, and grids were unambiguously observed. The CTAB addition reduced the threshold voltage required for switching the planar state to other optical states generated by the EHD effect.

Original language	English
Pages (from-to)	3208-3222
Number of pages	15
Journal	Optical Materials Express
Volume	11
Issue number	9
DOIs	https://doi.org/10.1364/OME.437701
State	Published - 1 Sep 2021

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title = "Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant",

abstract = "Cetyltrimethylammonium bromide (CTAB) was employed as an ionic dopant dispersed into a nematic liquid crystal characterized by its negative dielectric anisotropy. The electrohydrodynamic (EHD) effect in liquid crystal cells impregnated with various contents of CTAB was studied by dielectric spectroscopy and the corresponding electro-optical responses of the cells driven by an AC electric field were investigated. Compared with the undoped counterpart, the frequency range of the EHD regime after doping with 0.2-wt% CTAB into the liquid crystal was widened, and distinct optical textures, including dynamic scattering, stripes, and grids were unambiguously observed. The CTAB addition reduced the threshold voltage required for switching the planar state to other optical states generated by the EHD effect.",

author = "Hassanein Shaban and Wu, {Po Chang} and Lee, {Jia Hong} and Wei Lee",

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T1 - Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant

AU - Shaban, Hassanein

AU - Wu, Po Chang

AU - Lee, Jia Hong

AU - Lee, Wei

PY - 2021/9/1

Y1 - 2021/9/1

N2 - Cetyltrimethylammonium bromide (CTAB) was employed as an ionic dopant dispersed into a nematic liquid crystal characterized by its negative dielectric anisotropy. The electrohydrodynamic (EHD) effect in liquid crystal cells impregnated with various contents of CTAB was studied by dielectric spectroscopy and the corresponding electro-optical responses of the cells driven by an AC electric field were investigated. Compared with the undoped counterpart, the frequency range of the EHD regime after doping with 0.2-wt% CTAB into the liquid crystal was widened, and distinct optical textures, including dynamic scattering, stripes, and grids were unambiguously observed. The CTAB addition reduced the threshold voltage required for switching the planar state to other optical states generated by the EHD effect.

AB - Cetyltrimethylammonium bromide (CTAB) was employed as an ionic dopant dispersed into a nematic liquid crystal characterized by its negative dielectric anisotropy. The electrohydrodynamic (EHD) effect in liquid crystal cells impregnated with various contents of CTAB was studied by dielectric spectroscopy and the corresponding electro-optical responses of the cells driven by an AC electric field were investigated. Compared with the undoped counterpart, the frequency range of the EHD regime after doping with 0.2-wt% CTAB into the liquid crystal was widened, and distinct optical textures, including dynamic scattering, stripes, and grids were unambiguously observed. The CTAB addition reduced the threshold voltage required for switching the planar state to other optical states generated by the EHD effect.

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U2 - 10.1364/OME.437701

DO - 10.1364/OME.437701

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AN - SCOPUS:85114225705

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VL - 11

SP - 3208

EP - 3222

JO - Optical Materials Express

JF - Optical Materials Express

IS - 9

ER -

Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant

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