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Photocontrollable Photonic Crystals Based on Porous Silicon Filled with Photochromic Liquid Crystalline Mixtureстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
- Авторы: Bobrovsky Alexey, Svyakhovskiy Sergey, Bogdanov Alexey, Shibaev Valery, Cigl Martin, Hamplová Vera, Bubnov Alexej
- Журнал: Advanced Optical Materials
- Том: 8
- Номер: 22
- Год издания: 2020
- Первая страница: 2001267
- Последняя страница: 10
- Номер статьи: 2001267
- DOI: 10.1002/adom.202001267
- Аннотация: Novel photocontrollable photonic crystals based on porous silicon prepared by electrochemical etching are elaborated and their great potential for creation of photoswitchable materials is demonstrated. For this purpose, silicon-based photonic porous wafers are filled with photochromic liquid crystalline (LC) nematic mixture formulated by 4-pentyl-4′-cyanobiphenyl and a specific azobenzene derivative. Results of electron paramagnetic resonance spectroscopy reveal that molecules of LC mixture are aligned along the etched channels in silicon plate, i.e., in normal direction. UV irradiation (375 nm) of the resulting composite causes a shift of photonic band gap tolonger wavelengths by ≈10 nm. This phenomenon is explained by isothermal photoinduced nematic–isotropic phase transition associated with the bentshaped Z isomer formation of the azobenzene compound. During this transition, effective refractive index slightly increases as the initial homeotropic alignment of LC molecules transforms to the isotropic nonaligned state. This process is completely reversible under visible light action (428 nm) and can be repeated many times. Obtained photonic crystal photochromic LC composites can be considered as new promising material for photonic applications.
- Добавил в систему: Бобровский Алексей Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | AdvOptMater2020_Si.pdf | 1,2 МБ | 18 ноября 2020 [Bobrovsky365] |