Nonlinear Optical Properties of Liquid Crystals Studied in the Light Transmission Mode

Theoretical calculations on the nonlinear optical properties of nematic liquid crystals are presented, investigated using the polarization-optical method (POM) and differential scanning calorimetry (DSC). It was shown that, depending on the time scale, different processes induce a nonlinear optical response. It was discovered that, on the millisecond time scale, the source of the nonlinear optical response is thermal and depends, among other factors, on the main parameters that exclude mesophases, such as temperature and relative composition. It was suggested that the coupling of bonds and conformational changes play a significant role in these processes. It was established that, in the studied liquid crystals, the nonlinear response on the millisecond time scale has a thermal origin and depends on the specific mesophase, the relative concentration of components, and temperature. The deviation from the phenomenological Beer-Lambert law suggests the existence of interaction between the micelles and magnetic particles, the nature of which is still not fully understood.