Holographic Recording Characteristics Of Organic-inorganic ZrO₂Nano-composite Photopolymer Materials

Photopolymers materials have become the most potential candidate of digital holographic recordingbecause of its many attractive features, such as: low noise, real-time processing, high diffraction efficiency,self-developing capability, shape flexibility, low cost, and easy large-area processability. Butsimultaneously satisfying both requirements is considered difficult in conventional all-organicphotopolymers owing to the exposure shrinkage and the limited refractive index modulation of organicmaterials, which affect the properties of holographic storage and applied area. This thesis, based ontheoretical of the holographic storage principle and characteristics of photopolymer, ZrO₂-nanoperticalsdoped polyvinyl alcohol/acrylamide holographic recording photopolymers are fabricated to improve theholographic characteristics of the material. In this work, the mainly contents as follows:1. The material of polyvinyl alcohol/acrylamide blended with ZrO₂-nanoparticles for holographicstorage is fabricated. Through the improvement on the preparing process of photopolymer film, theseZrO₂-nanoparticles are uniformly doped in the polymer system.2. Organic-inorganic nano-composite photopolymer was also assessed by UV-Vis-NIRSpectrophotometer, X-ray Diffractometer and atom force microscopy. The distribution of differentrefractive indexes is described.3. The counter diffusion exists in the forming process of the grating of nano-particles and monomerwithin the sample is proved by experiment.4. The polymer samples doped with different density of ZrO₂-nanoparticles are prepared. Throughanalyzing the curve of transmittance, the homogeneity of such photopolymer film is demonstrated.5. The influence of ZrO₂-nanoperticles concentration on the diffraction efficiency and the refractiveindex modulation of the material are studied.6. The Bragg mismatch and the shrinkage of the optimum concentration of ZrO₂-nanoperticles dopedsamples are studied, combining experimental tests and theories, we get the conclusion that adding thosenanoparticles increases the dimensional stability of the samples during the exposure process.7. Two dimensional analog images and digital data pages are stored in the optimum concentration ofZrO₂-nanoparticles material, and the reconstructed images or data have good fidelity.