Optical Characterization of Novel Pdlc Systems

The objective of this research was to prepare PDLCs systems with improved liquid crystal/polymer composition for thermo- and electro-optical performance. Two thermosetting matrices based on an unsaturated polyester resin and a bifunctional epoxy resin respectively are employed to realise PDLCs. At a second step different dopants are used in order to prepare dye-doped PDLC (D-PDLCs) epoxy based films. The dyes contribute to an increase in light absorption thus reducing remarkably the power necessary to induce nonlinear optical effects. A complete optical thermo-optical and electro-optical characterisation a morphological study and finally an analysis of some nonlinear optical effects in these materials is performed. A comparison of the optical properties between D-PDLCs and undoped PDLCs is presented. Linear and nonlinear effects occurring in these materials such as self-transparency thermally induced optical bistability and optically induced light modulation are studied. This work confirms that PDLCs with optimised optical properties can be considered for the design of a range of different important optical devices.