Stoichiometric thiol-ene ratio dependence of refractive index modulation and polymerization shrinkage in holographic nanocomposite materials

摘要

We report on volume holographic recording in photopolymerizble nanocomposite materials using inorganic SiO2 nanoparticles dispersed in thiol-ene monomers capable of step-growth photopolymerization with various stoichiometric thiol-ene ratios. It is shown that while the refractive index modulation is maximized at the stoichiometric composition, polymerization shrinkage decreases with increasing the thiol monomer fraction.