Determination of the director profile in a twisted nematic cell from optical guided wave method
Prism, matching fluid of refractivity and twisted nematic liquid crystal cell can be assembled into the geometry of full leaky waveguide mode by selecting some appropriate parameters of them. A linear polarized light (p light or s light), which comes into and goes away from the liquid crystal layer by coupling prism, may form reflective light and transmission light. Because of the optical anisotropic of liquid crystal and the transmission of director of liquid crystal as the variation of applied voltage, two different signals, polarization-conserving signals and polarization-conversion signals, will be exist in both reflective light and transmission light. Using the full leaky waveguide technique, some experimental data of reflected light through the full leaky guided mode of twisted nematic liquid crystal corresponding to different angles were written down. And, by comparing these experimental data with the theoretical results obtained from multi-layer optics theory, the director profile of twisted nematic liquid crystal cell is determined.