We present a model which predicts the possibility of inducing pressure waves in Ne- matic Liquid Crystals (NLCs), enclosed in an elec- trical wave-guide, by means of a suitable peri- odic electric potential applied at the electrodes. By proposing a novel interaction term which in- cludes the coupling between mass density, direc- tor and gradient of director fields, we predict that a periodic voltage with the appropriate amplitude can lead to the sought-after acoustic resonance in NLCs. Our numerical simulations show that this constitutive assumption leads to results in agree- ment with previous experimental measures; more- over, our results could serve as a guidance to de- sign further experiments.
ROSI G, TERESI L, DELL'ISOLA F, & DICARLO A (2011). Coupling between mass density and director arrangement in Nematic Liquid Crystals. In Proceedings of the European COMSOL Conference 2011.