Keywords: ضبط هولوگرافی; Photopolymerization; Polymer nanocomposites; Photoinitator bis (.eta.5-2,4-cylcopentadien-1-yl)-bis (2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl) titanium; Photoinitiator 2,2-Dimethoxy-2-phenylacetophenone; Gold nanoparticles; Decomposition of photoinitiator;