Abstract
We demonstrate a new class of holographic recording constructed by hyperbranched polystyrene (HPS) or poly(ethyl methacrylate) (HPEM) dispersed in methacrylate photopolymers. Hyperbranched polymers behave as hard spheres in monomer and diffuse easily into gel networks without any aggregation. Holographic gratings are constructed by anisotropic distributions of polymer and hyperbranched nanoparticle layers formed by photo-polymerization of methacrylate monomers following phase separation of hyperbranched nanoparticles in the form of interference patterns by irradiation of two laser beams of different phase. High-contrast refractive index changes (Δn) with high recording sensitivity and dimensional stability are achieved for the system of HPEM-[2-methylacrylic acid 2-4-[2-(2-methylacryloyloxy)-ethylsulfanylmethyl]-benzylsulfanyl ethyl ester] (UV3000) as methacrylate monomer.
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