Abstract
Here we present new results on guest-host nematic systems featuring an optical degree of freedom based on the trans-cis photoizomerization of a single azo-bond or two azo-bonds in guest mesogens, with or without a longitudinal dipole moment. Homeotropic nematic layers in horizontal electric fields, subjected to illumination by UV or white light, were investigated. A marked, reversible UV increase of the flexoelectrooptic effect was found in case of guest molecules with a longitudinal dipole moment.
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