Photo- and electro-controllable 2D diffraction gratings prepared using electrohydrodynamic instability in nematic polymerizable mixture

Bobrovsky, A.; Shibaev, V.; Ostrovskii, B.; Cigl, M.; Hamplova, V.; Bubnov, A.

Авторы: Bobrovsky Alexey, Shibaev Valery, Ostrovskii Boris, Cigl Martin, Hamplova Vera, Bubnov Alexej
Журнал: Journal of Materials Chemistry С
Год издания: 2023
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d3tc01682j
Аннотация: Fast progress in modern information technologies requires the creation of new optical devices and diffractive elements that determines emergent activities in the related research fields. In this study, we propose and implement a novel approach for design of photo- and electro-controllable diffraction gratings. This approach is based on polymerization-induced fixation of periodic dissipative structures in nematic liquid crystals created by application of low-frequency AC electric field (50 Hz). The electrohydrodynamic (EHD) instability and convection flow leads to the formation of 2D diffraction gratings, which are then preserved through the polymerization of mono- and diacrylates incorporated into the nematic mixture. After dissolving and removing the non-polymerized low-molar-mass components, the resulting porous nematic networks with fixed EHD patterns are refilled with a nematic photochromic azobenzene-containing mixture. UV-irradiation induces E-Z isomerization of azobenzene-containing molecules, causing a decrease in birefringence, and, consequently, reducing the diffraction efficiency of the grating. This effect can be attributed to the formation of bent-shaped Z-isomers disrupting the liquid crystalline order. Visible light action recovers a high concentration of E-isomers and significantly increases the diffraction efficiency. A similar phenomenon is observed when a high-frequency AC electric field (1 kHz) is applied, inducing the alignment of mesogenic molecules along the field direction. Created photo- and electro-controllable diffraction gratings represent a promising class of advanced materials for applications in photonics and optoelectronics.
Добавил в систему: Бобровский Алексей Юрьевич

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Photo- and electro-controllable 2D diffraction gratings prepared using electrohydrodynamic instability in nematic polymerizable mixtureстатья

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