Quantifying azimuthal anchoring of nematics using in-plane fields and fully-leaky guided modes

In this work we present a new optical guided mode technique which is used t o monitor small perturbations to the director twist profile in a convention al liquid crystal cell. The cell is filled with nematic liquid crystal E7 w hich is homogeneously aligned using rubbed polyimide. Twist distortions are induced via the application of weak in-plane electric fields. Careful anal ysis of these distortions allows both the twist elastic constant, k(22) and the azimuthal anchoring strength, W-a, of the cell to be determined.