Electron Coupling And Micro - Displacement Measurement In Layered Composites

Under an applied electric field, a lot of optical properties of objects will change, This phenomenon is known as electro-optic effect, Electro-optical effect is often used to control optical intensity, frequency, phase, polarization and propagation direction, which has been broadly used in photoelectron elements such as optical switch, modulator, spatial light modulator, bistable optical device and waveguide. So Electro-optic materials are very important to us, but the current Electro-optic materials have some disadvantages, for example they are difficult to prepare and have weak chemical, poling and orientational stability, therefore, finding new materials having electro-optical effect is a significant orientation. In this paper, Electro-optical (E-O) composites based on the product of electrostrictive and elasto-optical effects were developed.Layered composites of PbZr1-xTixO3and polycarbonate were synthesized, and their E-O properties were studied. The Electro-optical retardation was observed to decrease along the direction vertical to the interface, suggesting a non-uniform stress distribution along the thickness direction in the elasto-optical layer. Saint-Venant’s principle or Local action principle was taken into account in analysis of the interlayer elastic coupling and the E-O effect. The theory that was consistent with experiments was obtained, based on this principle we designed a micro-displacement measuring system, compared with current measurements, this system has many advantages, for example, it has smaller nonlinearity error and larger scale. Furthermore, it is cheaper, lighter and more easily applied to the market.Many factors can affect the property of electro-optic composites, such as volume fraction and interfacing coupling, performances of electrostrictive phase and stress birefringence phase, Therefore, we must build a theoretical model that consistent with properties of composite materials. In this paper, elastic mechanics models and constitutive equations of electrostrictive and stress birefringence phase were used to study the non-uniform stress distribution along the thickness direction in the elasto-optical layer, which has important significance for many effects in composite.