Study of Holographic Storage Characteristics of Nanoparticle-doped Photopolyers

摘要

Photopolymer composite materials doped with different kinds of nanoparticles (such as SiO_2 TiO_2, Mg(OH)_2, etc.) were fabricated. Photopolymerization processes in the materials and some holographic performance parameters were measured and analyzed. The experimental results show that the maximum diffraction efficiency, maximum refractive index modulation and some other holographic performance parameters increase with the increase in the nanoparticles concentration until it arrives the optimum concentration. Especially, the Bragg-mismatch angle of the material films decreases obviously and the dimensional stability is more remarkably improved, too. For example, the shrinkage rate of the sample films undoped and or doped with TiO_2 nanoparticles, decreases from 1.12% to 0.28%. The surface structure of the two dimensional holographic gratings was investigated by Scanning Electron Microscopy. Two dimensional digital images generated by Spatial Light Modulator were stored in the thick films (about 200um), and the reconstructed data pages have good fidelity. The results show that the nanoparticle-doped photopolymer materials have a better potential in holographic storage.