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Light-stimulated electro-optics by azo-doped aerosil/7CB nanocomposites

Hadjichristov G. B., Marinov Y. G., Petrov A. G., Prasad S. K.

Opto-Electronics Review

2018

Vol. 26, No. 2

172--182

Photoactive nanofilled nematic is proposed. Stable three-component photoresponsive nanocompositewas prepared from photo-insensitive nanofilled nematic by inclusion of 3 wt.% azobenzene-containingphotoactive mesogen 4-(4’-ethoxyphenylazo)phenyl hexanoate (EPH). The host nanofilled nematicwas produced from the room-temperature nematic liquid crystal 4-n-heptyl cyanobiphenyl (7CB) and3 wt.% filler of Aerosil 300 hydrophilic silica nanospheres of size 7 nm. Apparent effect of stimulation with a relatively weak continuous illumination by UV light (375 nm wavelength) takes placefor both the alternating-current electric field-dependent optical transmittance and the electro-opticamplitude-frequency modulation by thin films (25 μm thick) of the EPH/aerosil/7CB nanocomposite. Thelight-stimulated electro-optics of EPH-doped aerosil/7CB films and the corresponding reversible lightcontrol are achieved through trans-cis-trans photoisomerization of the photoactive agent EPH. As such,the initial electro-optical response of the studied photoactive nanocomposites is recovered with continuous blue-light illumination. The examined EPH/aerosil/7CB nanocomposites exhibit photo-controllableelectro-optical response that is of practical interest.