Orientational Structure and Electro-Optical Properties of Chiral Nematic Droplets with Conical Anchoring

Feizer Kristina A.; Krakhalev Mikhail N.; Rudyak Vladimir Yu.; Zyryanov Victor Ya.

Дополнительные ссылки: eLibrary

База данных: Каталог библиотеки СФУ

Библиографическое описание: Orientational Structure and Electro-Optical Properties of Chiral Nematic Droplets with Conical Anchoring : научное издание / Kristina A. Feizer [et al.]. - Текст : непосредственный // Molecules. - 2025. - Т. 30, № 24. - P. 4761. - ISSN 1420-3049, DOI 10.3390/molecules30244761.

Аннотация: The polymer dispersed liquid crystals (PDLCs) with conical boundary conditions are considered. PDLC films with different values of the relative chirality parameter N0 of chiral nematic droplets ranging from 0 to 1.32 are studied experimentally and theoretically. In flattened spheroid-shaped chiral nematic droplets, a twisted axial-bipolar structure is formed whose twist angle increases with rising N0 value. Two stable states of the structure are revealed: one with the bipolar axis oriented perpendicular to the short axis of the spheroid and another with the bipolar axis oriented parallel to it. Applying a small voltage causes the bipolar axes of the chiral nematic droplets to reorient parallel to the electric field. The structure is unwound in strong electric fields, and the droplet order parameter reaches a high value of nearly 0.95. These features of the voltage-induced reorientation of the axial-bipolar structure explain the experimentally observed characteristic electro-optical properties of PDLC cells: high transmittance Tmax≅0.90 in the on-state and low control voltages of less than 35 V. The minimum transmittance of the PDLC cells decreases as the value of N0 increases; for samples with N0≥0.60, the contrast ratio exceeds 145.

Год издания: 2025

Авторы: Feizer Kristina A. , Krakhalev Mikhail N. , Rudyak Vladimir Yu. , Zyryanov Victor Ya.

Издательство: MDPI

Источник: Molecules

Выпуск: Т. 30, № 24

Номера страниц: 4761

Держатель оригинала документа: Department of Condensed Matter, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel, Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

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Orientational Structure and Electro-Optical Properties of Chiral Nematic Droplets with Conical Anchoring
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