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Photomodulating the spontaneous polarization of a ferroelectric liquid crystal phase using chiral thioindigo dopants

The chiral thioindigo dye (R,R)-5,5'-dinitro-6,6'-bis(2- octyloxy)thioindigo has been synthesized in optically active form and doped into a racemic SC liquid crystal host (xd equals 0.028) to induce a ferroelectric SC* phase. Irradiation of an aligned sample of this induced SC* phase at (lambda) greater than 450 nm produces a cis- enriched photostationary state of the dopant, and an increase in the spontaneous polarization of the SC* phase by a factor of 1.8. This modulation is reversible via thermal relaxation of the dopant to the trans-form.