Photocontrollable photonic crystals based on porous silicon filled with photochromic liquid crystalline mixture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F20%3A00535113" target="_blank" >RIV/68378271:_____/20:00535113 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1002/adom.202001267" target="_blank" >https://doi.org/10.1002/adom.202001267</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adom.202001267" target="_blank" >10.1002/adom.202001267</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photocontrollable photonic crystals based on porous silicon filled with photochromic liquid crystalline mixture

Popis výsledku v původním jazyce

Novel photocontrollable photonic crystals based on porous silicon prepared by electrochemical etching were elaborated and their great potential for creation of photoswitchable materials was demonstrated. Porous silicon-based photonic porous wafers were filled with photochromic mixture based on nematic LC and azobenzene derivative. According to EPR measurements, molecules of LC mixture are aligned along the etched channels in silicon plate. UV-irradiation of composite causes a shift of photonic band gap to longer wavelengths by ca. 10 nm. This phenomenon is explained by isothermal photoinduced nematic–isotropic transition associated with formation bent-shaped Z-isomer, effective refractive index slightly increases as initial homeotropic alignment of LC mixture transforms to non-aligned state. This process is completely reversible under visible light (428 nm). Obtained photonic crystal photochromic LC composites can be considered as new promising materials for photonics.n

Název v anglickém jazyce

Photocontrollable photonic crystals based on porous silicon filled with photochromic liquid crystalline mixture

Popis výsledku anglicky

Novel photocontrollable photonic crystals based on porous silicon prepared by electrochemical etching were elaborated and their great potential for creation of photoswitchable materials was demonstrated. Porous silicon-based photonic porous wafers were filled with photochromic mixture based on nematic LC and azobenzene derivative. According to EPR measurements, molecules of LC mixture are aligned along the etched channels in silicon plate. UV-irradiation of composite causes a shift of photonic band gap to longer wavelengths by ca. 10 nm. This phenomenon is explained by isothermal photoinduced nematic–isotropic transition associated with formation bent-shaped Z-isomer, effective refractive index slightly increases as initial homeotropic alignment of LC mixture transforms to non-aligned state. This process is completely reversible under visible light (428 nm). Obtained photonic crystal photochromic LC composites can be considered as new promising materials for photonics.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Advanced Optical Materials

ISSN

2195-1071

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

000579410700001

EID výsledku v databázi Scopus

2-s2.0-85092725981