Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.358, 167-183, 2001
Second-harmonic generation in chiral liquid crystals
Second-Harmonic Generation (SHG) occurs under special circumstances in chiral liquid crystals, such as Ferroelectric Liquid Crystals and, induced by an external electric field, in Short-Pitch Cholesteric Liquid Crystals. Previously, SHG in FLCs has been studied mainly for the application potential of FLCs as a promising NLO-material. However, with the discovery in the last three years of novel electro-optic effects and liquid crystalline phases - i.e., the high-contrast, analog "V-shaped switching" found to occur in so-called "thresholdless antiferroelectric" liquid crystals; and liquid crystals consisting of bow-shaped molecules - the emphasis is shifting towards SHG becoming a standard tool of investigation in liquid crystal research. In this context symmetry, manifestations of chirality as well as analysis and interpretation issues become more important than ever before.
Keywords:second-harmonic generation;chirality;ferroelectric liquid crystal;cholesteric liquid crystal;nonlinear optics;"thresholdless antiferroelectricity"