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Photo-electro-induced orientational processes in LC polymer systemsтезисы доклада
- Авторы: Bobrovsky A.Yu, Shibaev V.P.
- Сборник: 14th European Conference on Liquid Crystals, June 25-30, 2017, Moscow, Russia. Book of abstracts.
- Тезисы
- Год издания: 2017
- Место издания: Москва, Россия
- Аннотация: Photo-, electro-induced orientation, photofluidization and photoinduced masstransferprocesses observed in polymer and low-molar-mass materials attract agreat attention due to the promising potential for application in holography,optoelectronics, as well as for the creation of different nanodevices, microlasers,etc. In this report the peculiarities of these processes in LC polymer systems willbe discussed and some possible applications of the designed photo- and electroactiveLC materials will be demonstrated.The first part of the presentation deals with the study of the phase behavior andphotooptical properties of films of several novel azobenzene-containing LCpolymethacrylates. Two different phenomena were investigated: irradiation of thesamples by polarized unfocused light results in orientation of chromophores indirection perpendicular to the polarization plane; on the other hand, irradiation byhighly focused laser beam induces mass transfer processes. A special attention isfocused on the investigations of these photoinduced processes and influence ofmesomorphic properties of the polymers on peculiarities of these phenomena.The second part of the presentation is devoted to the creation of the polarizationselective gratings in LC polymer systems: (i) by phototunable modulation of thehelix pitch (P) in polymer cholesteric mixtures based on the nematic side-chainpolymer doped with chiral-photochromic compound, and (ii) by application ofelectric field to photosensitive cholesteric polymer mixture or polymer-stabilizedcholesteric films with large helix pitch. In the first case modulation of P wasinduced by UV-irradiation with spatially-modulated intensity that causes E-Zisomerization of a chiral-photochromic dopant. It was shown that the gratingsrecorded by UV-exposure are strongly selective to the handedness of circularpolarized light. The obtained films open very interesting possibilities fordevelopment of materials for stable diffraction gratings. Both, position and widthof the spectral range of diffraction can be easily controlled by the UV-exposureand concentration of the dopant. In the second case application of electric fieldinduces diffraction gratings of different types and variable period, which can beprecisely tuned by UV-irradiation.Our results demonstrate promising properties of the elaborated systems for thedevelopment of novel photo- and electro-responsive materials for optics andphotonics.This research was supported by the Russian Science Foundation (14-13-00379)
- Добавил в систему: Бобровский Алексей Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | ECLC_2017_Bobrovsky.pdf | 20,9 КБ | 20 января 2021 [Bobrovsky365] |