Open Access
Journal of Molecular Liquids, издание 339, страницы 117141
Sign-alternating optical reorientation in nematic liquid crystals with low-molar-mass and polymeric absorbing bis-azobenzene dopants
Budagovsky I. A.
1
,
Kuznetsov Aleksey M.
1
,
Shvetsov S. A.
2, 3
,
Smayev Mikhail
1
,
Zolotko Alexander
1
,
Cigl Martin
4
,
Hamplová V.
4
,
4
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic.
Тип публикации: Journal Article
Дата публикации: 2021-10-01
Elsevier
Журнал:
Journal of Molecular Liquids
Квартиль SCImago: Q1
Квартиль WOS: Q1
Impact factor: 6
ISSN: 01677322, 18733166
Materials Chemistry
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
Spectroscopy
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Краткое описание
• Incorporation of bis-azobenzene monomer into the polymeric chain increases the sign-alternating nonlinearity of an NLC. • After incorporation the orientational nonlinearity increases in both positive and negative regions. • Critical angle of the sign-alternating nonlinearity decreases for polymeric molecule. • Passage from the low- to the high-molar-mass dopant increases enhancement factors related to trans- and cis -isomers. A comparative study of optical orientation in nematic liquid crystals (NLCs) doped with a low-molar-mass bis-azobenzene dye (monomer) and a comb-shaped polymer with side fragments similar in structure to the monomer has been carried out. Both types of bis-azobenzene dopants induced a sign-alternating nonlinearity in the NLC: the positive when the angle Ψ between the light field and the director is less than a certain critical value Ψc and the negative in the opposite case of Ψ c < Ψ ≤ 90°. The transition from the monomer to polymer led to a decrease in the critical angle Ψ c , i.e., to an expansion of the region of negative nonlinearity. At the same concentration of chromophores, an increase in both negative and positive nonlinearities occurs. The magnitudes of the optical-torque enhancement factors due to trans- and cis -isomers (η T and η C ), and the ratios η T /η C for the low- and high-molar-mass dopants are compared. The results obtained show the possibilities of increasing the orientational optical nonlinearity when passing from low-molar bis-azobenzene dye dopants to the corresponding polymers and are important for elucidating the optimal architecture of absorbing additives.
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Budagovsky I. A. et al. Sign-alternating optical reorientation in nematic liquid crystals with low-molar-mass and polymeric absorbing bis-azobenzene dopants // Journal of Molecular Liquids. 2021. Vol. 339. p. 117141.
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Budagovsky I. A., Kuznetsov A. M., Shvetsov S. A., Smayev M., Zolotko A., Cigl M., Hamplová V., Bobrovsky A. Sign-alternating optical reorientation in nematic liquid crystals with low-molar-mass and polymeric absorbing bis-azobenzene dopants // Journal of Molecular Liquids. 2021. Vol. 339. p. 117141.
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TY - JOUR
DO - 10.1016/j.molliq.2021.117141
UR - https://doi.org/10.1016/j.molliq.2021.117141
TI - Sign-alternating optical reorientation in nematic liquid crystals with low-molar-mass and polymeric absorbing bis-azobenzene dopants
T2 - Journal of Molecular Liquids
AU - Budagovsky, I. A.
AU - Kuznetsov, Aleksey M.
AU - Shvetsov, S. A.
AU - Smayev, Mikhail
AU - Zolotko, Alexander
AU - Cigl, Martin
AU - Hamplová, V.
AU - Bobrovsky, Alexey
PY - 2021
DA - 2021/10/01 00:00:00
PB - Elsevier
SP - 117141
VL - 339
SN - 0167-7322
SN - 1873-3166
ER -
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@article{2021_Budagovsky
author = {I. A. Budagovsky and Aleksey M. Kuznetsov and S. A. Shvetsov and Mikhail Smayev and Alexander Zolotko and Martin Cigl and V. Hamplová and Alexey Bobrovsky},
title = {Sign-alternating optical reorientation in nematic liquid crystals with low-molar-mass and polymeric absorbing bis-azobenzene dopants},
journal = {Journal of Molecular Liquids},
year = {2021},
volume = {339},
publisher = {Elsevier},
month = {oct},
url = {https://doi.org/10.1016/j.molliq.2021.117141},
pages = {117141},
doi = {10.1016/j.molliq.2021.117141}
}
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Budagovsky, Ivan, et al. “Sign-Alternating Optical Reorientation in Nematic Liquid Crystals with Low-Molar-Mass and Polymeric Absorbing Bis-Azobenzene Dopants.” Journal of Molecular Liquids, vol. 339, Oct. 2021, p. 117141. Crossref, https://doi.org/10.1016/j.molliq.2021.117141.